ASCO Series 300 Automatic Transfer Switches

Table of Contents

• INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 1

• SEQUENCE OF OPERATION . . . . . . . . . . . . . 2

• TESTING & SERVICE . . . . . . . . . . . . . . . . . . . . 3

• ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . 4

• CONTROL FEATURES . . . . . . . . . . . . . . . . . . . 5

• INDEX . . . . . . . . . . . . . . . . . . . . . . . . . back cover

An experienced licensed electrician must install the ATS.

[DANGER] DANGER is used in this manual to warn of high voltages capable of causing shock, burns, or death.

[WARNING] WARNING is used in this manual to warn of possible personal injury.

[CAUTION] CAUTION is used in this manual to warn of possible equipment damage.

Refer to the outline and wiring drawings provided with ASCO Series 300 ATS for all installation details.

Image Description: Two photographs of ASCO Series 300 Automatic Transfer Switch enclosures. The left image shows units for 600, 800, and 1000 amp sizes. The right image shows a 1200 amp size unit.

Company Information:

ASCO POWER TECHNOLOGIES L.P. 50 Hanover Road, Florham Park, New Jersey 07932-1591 USA

Telephone: 1 800 937-2726 (ASCO), For service call: 1 800 800-2726 (ASCO) | www.asco.com

ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3

Telephone: 519 758-8450, Fax: 519 758-0876, For service call: 1 888 234-2726 (ASCO) | www.asco.ca

Document Identifier: 381333-201 B

Nameplate and Catalog Number Identification

The Transfer Switch nameplate includes data for each specific ASCO Series 300 ATS. Use the ATS only within the limits shown on this nameplate.

Catalog Number Identification

A typical Catalog Number is shown below with its elements explained. The example is for a Series 300 ATS with switched neutral, 3 pole, 600 amp, 480 V, in a Type 1 enclosure:

H300 B 3 600 N 1 C

* Available 600 - 1000 amp. sizes only

Image Description: An open enclosure of a 600 amp ASCO Series 300 ATS, showing internal components with labels pointing to:

• neutral connections
• power connections
• Transfer Switch
• terminal block TB for engine start and switch position contacts
• Controller
• membrane controls

ASCO Series 300 ATS Compliance and Suitability

ASCO Series 300 Automatic Transfer Switches (ATSs) are Listed under Underwriters Laboratories UL 1008 Standard for Safety for Automatic Transfer Switches. All control features are UL Component Recognized, which assures that ASCO automatic transfer switches meet OSHA Safety Requirements and will be acceptable to electrical inspectors.

ASCO Series 300 Automatic Transfer Switches are suitable for emergency and standby system applications. They meet emergency system rating requirements as defined in National Electrical Code (NEC) Article 700 and UL 1008. Also, they are suitable for the requirements of NEC Article 517 – Health Care Facilities, NEC Article 701 – Legally Required Standby Systems, NEC Article 702 – Optional Standby Systems, NFPA 99 Health Care Facilities, and NFPA 110 Emergency and Standby Power Systems.

Rating Label

Each automatic transfer switch contains a rating label to define the loads and fault circuit withstand / closing ratings. Refer to the label on the transfer switch for specific values.

[WARNING] Do not exceed the values on the rating label. Exceeding the rating can cause personal injury or serious equipment damage.

Image Description: An open enclosure of an 800 and 1000 amp ASCO Series 300 ATS, showing internal components with labels pointing to:

• neutral connections
• power connections
• Transfer Switch
• terminal block TB for engine start and switch position contacts
• Controller
• membrane controls

Image Description: An open enclosure of a 1200 amp ASCO Series 300 ATS, showing internal components with labels pointing to:

• neutral connections
• power connections
• Transfer Switch
• terminal block TB for engine start and switch position contacts
• Controller
• membrane controls

Section 1: Installation

Series 300 Automatic Transfer Switches are factory wired and tested. Installation requires skid removal then securing the enclosure to the supporting foundation.

Remove the Shipping Skid

Open the front door and remove the four lag screws (2 in front, 2 in rear) securing enclosure to the wood skid.

Supporting Foundation

The supporting foundation for the enclosure must be level and straight. Refer to the applicable enclosure outline drawing included with the Series 300 for all mounting details including door opening space.

If bottom cable entry is used, the foundation must be prepared so that the conduit stubs are located correctly. Refer to the enclosure outline drawing for specified area and location. Provide cable bending space and clearance to live metal parts. When a concrete floor is poured, use interlocking conduit spacer caps or a wood or metal template to maintain proper conduit alignment.

Mounting

Refer to the applicable enclosure outline drawing furnished with this switch and mount the Series 300 according to details and instructions shown on diagram.

Line Connections

Refer to the Wiring Diagram provided with your Series 300 ATS. All wiring must be made in accordance with the National Electrical Code and local codes.

It is unnecessary to remove pole covers from the transfer switch. If you do remove them, reinstall them carefully.

Testing Power Conductors

Do not connect the power conductors to the ASCO Series 300 transfer switch until they are tested. Installing power cables in conduit, cable troughs and ceiling-suspended hangers often requires considerable force. The pulling of cables can damage insulation and stretch or break the conductor's strands. For this reason, after the cables are pulled into position, and before they are connected, they should be tested to verify that they are not defective or have been damaged during installation.

[CAUTION] Protect the automatic transfer switch from construction grit and metal chips to prevent malfunction or shortened life of the ATS.

Connecting Power Conductors

After the power cables have been tested, connect them to the appropriate terminal lugs on the transfer switch as shown on the wiring diagram provided with this Series 300. Make sure the lugs provided are suitable for use with the cables being installed. Standard terminal lugs are solderless screw type and will accept the wire sizes listed on the drawings provided with the Series 300. Be careful when stripping insulation from the cables; avoid nicking or ringing the conductor. Remove surface oxides from cables by cleaning with a wire brush. When aluminum cable is used, apply joint compound to conductors. Tighten cable lugs to the torque specified on rating label.

Controller Ground

A grounding wire must be connected to the controller's lower left mounting stud. Because the controller is mounted on the enclosure door, a conductive strap must be used between the enclosure and the door. This connection provides proper grounding which does not rely upon the door hinges.

Harnesses

The transfer switch is connected to the left side of the controller by a plug-in harness (two plugs).

Installation (continued)

Engine Starting Contacts

Customer connections for engine control contact and TS auxiliary contacts connections are located on terminal block TB which is mounted on the front lower left of the transfer switch. Refer to wiring diagram provided with the Series 300 ATS and connect the engine start wires to the appropriate terminals. See Figure 1-1 and Table A.

Image Description: A diagram showing the left side of a transfer switch with labels pointing to the terminal block TB for engine start and auxiliary circuit connections.

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals on transfer switch terminal block TB as shown on the wiring diagram provided with this Series 300 Automatic Transfer Switch. Make the necessary auxiliary connections by referring to Section 5, Control Features.

Connections to Controller for other Control Features

(located on bottom of Controller)

• Load Disconnect Feature Connections (see Wiring Diagram & refer to page 5-4 for DIP switch settings)
• Programmable Engine Exerciser connection, if provided (refer to page 5-3)

Image Description: Figure 1-2 shows the input/output label on the Controller, indicating possible connections to the lower terminal block. It details connections for Load Disconnect Contacts, Optional Engine Exerciser, and Input/Output Contacts, along with various control features like Test, Bypass Time Delay, Set Engine Exerciser, and factory use terminals.

Remote Control Features Connections

(refer to the Wiring Diagram & page 5-4 for DIP switch settings)

Each control contact must be suitable for a 5 V DC low energy circuit.

Installation (continued) – Functional Test

The Functional Test consists of three checks: manual operation, voltage checks, and electrical operation.

[CAUTION] Do these checks in the order presented to avoid damaging the automatic transfer switch.

Read all instructions on the Wiring Diagram and labels affixed to the automatic transfer switch. Note the control features that are provided and review their operation before proceeding.

1 – Manual Operation Test

A detachable maintenance handle is provided on the frame of the Transfer Switch for maintenance purposes only. Manual operation of the transfer switch should be checked before it is energized (operated electrically).

1. After deenergizing both power sources, open the enclosure door. Locate and remove the maintenance handle from the clips on the left side of the transfer switch frame. Insert the handle into the hole in the molded hub on the left side of the operator. See Figures 1-3 and 1-4 and Table B.
2. Move the maintenance handle up or down as shown to manually operate the transfer switch. It should operate smoothly without any binding. If it does not, check for shipping damage or construction debris.

Image Description: Figure 1-3 shows the maintenance handle and its storage clips on the left side of the transfer switch frame.

Image Description: Figure 1-4 illustrates the manual operation of the transfer switch using the maintenance handle. It shows the handle positions (up/down) and their corresponding effects on the contacts. It also points out the window indicators (right side) showing contact position (O for open, C for closed) for both Normal and Emergency contacts.

3. Return the transfer switch to the Normal position. Observe that the window indicators (right side) show the top shaft O (open) and the bottom shaft C (closed). Note: If Normal and Emergency connections are reversed, this operation is also reversed.
4. Remove the maintenance handle and store it on the frame (left side) in the clips provided.

Now continue to 2 – Voltage Checks on next page.

Installation (continued) – Voltage Checks

First check nameplate on transfer switch; rated voltage must be the same as normal and emergency line voltages.

[CAUTION] Verify that the feeders have been connected to the proper lugs.

Perform steps 1 through 6 at the right. Observe the status lights. See Figure 1-5.

• ● Black circle means light is on.
• ○ White circle means light is off.

* If necessary, adjust voltage regulator on the generator according to the manufacturer's recommendations. The Automatic Transfer Switch will respond only to the rated voltage specified on the Transfer Switch nameplate.

1. Close the normal source circuit breaker. The Transfer Switch Connected To Normal and the Normal Source Available lights should come on.
2. Use an accurate voltmeter to check phase to phase and phase to neutral voltages present at the transfer switch normal source terminals.
3. Close the emergency source circuit breaker. (Start generator, if necessary.) The Transfer Switch Connected To Normal and the Emergency Source Available lights should come on.
4. Use an accurate voltmeter to check phase to phase and phase to neutral voltages present at the transfer switch emergency source terminals.*
5. Use a phase rotation meter to check phase rotation of emergency source; it must be the same as the normal source.
6. Shut down the engine-generator, if applicable. The Emergency Source Accepted light should go off. Then put the starting control selector switch (on the generator set) in the automatic position. Close enclosure door.

Now continue to 3 – Electrical Operation on next page.

Image Description: Figure 1-5 shows standard controls and indicators for the ASCO Automatic Transfer Switch. It includes labels for Load Connected To (Normal, Emergency) and Source Available (Normal, Emergency). It also shows buttons for Transfer Switch Test, Bypass Time Delay, Set Engine Exerciser, and indicates how to observe lights.

Installation (continued) – Electrical Operation

First check nameplate on transfer switch; rated voltage must be the same as normal and emergency line voltages.

[CAUTION] Verify that the feeders have been connected to the proper lugs.

Perform steps 1 through 8 at the right. Observe the status lights. See Figure 1-6.

• ● Black circle means light is on.
• ○ White circle means light is off.

NOTE: If Motor Load Transfer feature is activated, then transfer may not occur immediately after the respective time delays. Transfer will only occur when the phase relationship between sources is correct.

This completes the Functional Test of the ASCO Series 300 Automatic Transfer Switch. Leave the engine-generator starting control in the automatic position.

1. The normal source must be available and the generator must be ready to start. Check that the Normal Source Available light is on.
2. Press and hold the Transfer Switch Test button until the engine starts and runs. This should happen within 15 sec.
3. The Emergency Source Available light should come on.
4. The transfer switch should transfer to the Emergency position. The Load Connected to Emergency light should come on and the Load Connected to Normal light should go off.
5. If the transfer to emergency delay is used, the transfer should occur after a time delay (up to 5 minutes). For immediate transfer press the Bypass Time Delay button.
6. The transfer switch should transfer back to the Normal position. The Load Connected to Normal light should come on and the Load Connected to Emergency light should go off.
7. If the retransfer to normal delay is used, the retransfer should occur after a time delay (up to 30 minutes). For immediate retransfer press the Bypass Time Delay button.
8. The unloaded running delay keeps the generator running for 5 minutes (cool-down period). Then the generator should stop and the Emergency Source Available light should go off.

Image Description: Figure 1-6 shows standard controls and indicators for the ASCO Automatic Transfer Switch, similar to Figure 1-5, with labels for Load Connected To (Normal, Emergency) and Source Available (Normal, Emergency). It highlights the Transfer Switch Test and Bypass Time Delay buttons and indicates how to observe status lights.

Section 2: Sequence of Operation

Transfer To Emergency

The sequence for load transfer to emergency source begins automatically when normal source voltage falls below the preset dropout point or when Transfer Switch Test button is pressed. An under voltage condition on any phase of the normal source is detected by the sensor.

When the normal source voltage fails or the Transfer Switch Test button is pressed, the SE relay de-energizes and relay NR begins its timing cycle (1 or 3 seconds, momentary normal source outage delay). The NR relay is provided with a time delay on dropout to override momentary outages and prevent nuisance starting of the engine-driven generator. If the normal source voltage returns above the sensor dropout setting before the time delay expires, the NR relay timing cycle is reset to zero and relay SE energizes.

If the normal source voltage does not return above the sensor dropout setting before the time delay expires, the NR relay de-energizes and signals the engine-driven generator to start. At the same time, a voltage and frequency sensor begins monitoring the emergency source. The sensor will accept the emergency source only when both voltage and frequency reach preset pickup points. Usually about ten seconds elapse from dropout of the NR relay to acceptance by the sensor. This time span occurs because the engine-driven generator must crank, start, and run up to nominal pickup points. For this reason, if the Transfer Switch Test button is pressed it must be held for 15 seconds. If the emergency source is available immediately, the sensor may accept it as soon as NR relay drops out.

When the emergency source is accepted by the sensor, relay ER begins its timing cycle (transfer to emergency delay). ER relay is provided with an adjustable (0 to 5 minutes) time delay on pickup to delay transfer of the load to the emergency source. For immediate transfer press Bypass Time Delay button.

ER relay energizes, the TS coil is energized, the transfer switch operates, and all switch contacts (mains, controls, auxiliaries) reverse position. The transfer switch is now supplying the load from the emergency source.

The transfer switch will remain in the Emergency position until the normal source is restored. If the Transfer Switch Test button is used, the transfer switch will remain on emergency until the retransfer to normal delay times out.

Image Description: Figure 2-1 shows the membrane controls and indicator lights on the ASCO Automatic Transfer Switch. It illustrates the function of the Transfer Switch Test and Bypass Time Delay buttons, including timing for engine start and exercise periods. It also shows the indicator lights for Load Connected To and Source Available.

Retransfer to Normal

The sequence for load retransfer to the normal source automatically begins when the voltage sensor detects restoration of the normal source. The voltage level must rise above the preset pickup point on all phases before the sensor will accept the normal source.

When the normal source is accepted by the sensor, relay SE begins its timing cycle (adjustable 1 sec. to 30 min., retransfer to normal delay). For immediate retransfer press Bypass Time Delay button. SE relay is provided with a time delay on pickup to prevent immediate load retransfer to the normal source. The delay insures that the normal source has stabilized before reconnection of vital loads. If the normal source voltage falls below the present dropout point before the time delay expires, the timing cycle is reset to zero. If the emergency source fails for more than 4 seconds during the timing cycle, ER relay drops out and the load is immediately retransferred to the normal source, if that source is acceptable.

SE relay energizes and ER relay is dropped out. The TS coil is energized, the transfer switch operates, and all switch contacts (mains, controls, auxiliaries) reverse position. The transfer switch is now supplying the load from the normal source again.

Upon retransfer to the normal source, NR relay begins its timing cycle (unloaded running delay [engine cooldown]). NR relay is provided with a 5 minute time delay on pickup to keep the engine running for a cool-down period.

NR relay energizes after the time delay and signals the engine-driven generator to shut down. All circuits are reset for any future normal source failure.

Activation of standard control features shown in Section 5 will alter the sequence of operation and introduce additional time delays during transfer operations.

Section 3: Testing & Service

Preventive Maintenance

Reasonable care in preventive maintenance will insure high reliability and long life for the automatic transfer switch.

Operate the switch at least once a month. Perform this four step Electrical Operation Test. This is a test with load transfer.

Disconnecting the Controller

The harness disconnect plugs are furnished for repair purposes only and should not have to be unplugged. If the controller must be isolated, follow these steps carefully.

Disconnecting the Plugs

1. Observe the position of the transfer switch.
• a. If the transfer switch is in the Normal position, place standby engine starting control in the off position. Then open the emergency source circuit breaker.
• b. If the transfer switch is in the Emergency position, open the normal source circuit breaker. Place the engine starting control in the test or run position.
2. Separate the quick disconnect plugs by squeezing the latches. Do not pull on the harness wires.
3. Label, remove, and tape the signal wires connected to the engine start terminals on the transfer switch: TB1 and TB3, or TB1 and TB2.

Reconnecting the Plugs

1. Observe the position of the transfer switch.
• a. If the transfer switch is in the Normal position, be sure that the standby engine starting control is still in the off position. The emergency source circuit breaker still should be open.
• b. If the transfer switch is in the Emergency position, normal source circuit breaker still should be open.
2. Reconnect the signal wires connected to the appropriate engine start terminals on the transfer switch. See Section 1, Engine Starting Contacts.
3. The harness plugs and sockets are keyed. Carefully align the plugs with the sockets and press straight in until both latches click.
4. Restore the opposite source as follows:
• a. If the transfer switch is in the Normal position, place the standby engine starting control in the automatic position. Then close the emergency source circuit breaker.
• b. If the transfer switch is in the Emergency position, close the normal source circuit breaker. The load will be automatically retransferred to the normal source after the Retransfer to Normal Delay. For immediate retransfer, press BYPASS TIME DELAY button. Place the engine starting control in the automatic position.

Transfer Switch Test

1. Press and hold the door-mounted TRANSFER SWITCH TEST button until the engine starts and runs. This should happen within 15 seconds.
2. The transfer switch will operate to the Emergency position. If the Transfer To Emergency Delay is used, the transfer will occur after a time delay (up to 5 minutes). For immediate transfer press BYPASS TIME DELAY button.
3. The Transfer Switch will operate back to the Normal position after the Retransfer To Normal Delay (up to 30 minutes). For immediate retransfer press BYPASS TIME DELAY button.
4. Unloaded Running (Engine Cooldown) Delay allows engine to run unloaded for 5 minutes.

Maintenance

Clean and inspect the switch once a year. De-energize all sources, then brush and vacuum away any excessive dust accumulation. Remove the transfer switch barriers and check contact condition. Replace contacts when pitted or worn excessively. Reinstall the barriers carefully.

Maintain transfer switch lubrication. The transfer switch has been properly lubricated, and under normal operating conditions no further lubricating is required. Renew factory lubrication if the switch is subjected to severe dust or abnormal operating conditions. Relubricate the operator if TS coil is replaced. Order lubrication kit 75-100.

Replacement Parts

Replacement parts are available in kit form. When ordering parts provide the Serial No. and Catalog No. from the transfer switch nameplate. Contact your local ASCO Power Technologies sales office or ASI. In the United States call 1-800-800-ASCO (2726), or in Canada call 1-888-234-ASCO (2726).

Trouble-Shooting

Note the control features that are activated or furnished on the switch and review their operation. Refer to Section 5, Control Features.

Trouble-Shooting the Motor Load Transfer Feature (refer to page 5-3)

1. Connect a voltmeter (set for twice system phase-to-phase voltage) between Transfer Switch terminals NA and EA.
2. Manually start generator. Voltmeter needle should sweep back and forth at a regular rate between 0 and about twice system voltage.
3. Press and hold TRANSFER SWITCH TEST button. The load should transfer to emergency source when meter needle is near 0 volts. If transfer does not occur, Motor Load Transfer feature is not operating.
4. Release the Transfer Switch Test button. The load should retransfer back to the normal source after the Retransfer to Normal Delay, if used. The retransfer should occur when the needle is near 0 volts. If retransfer does not occur after the time delay, the Motor Load Transfer feature is not operating.
5. For immediate retransfer, press the BYPASS TIME DELAY button. Then disconnect the voltmeter.

If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies sales office or ASI. In the United States, call 1-800-800-2726. In Canada, call 1-888-234-2726. Furnish the Serial No., Bill of Material (BOM) No., & Catalog No. from transfer switch nameplate.

Section 4: Adjustments

Time Delay Adjustment

Standard time delays are set to customer specifications (if none specified, standard factory settings are used). To change a setting, follow procedure on page 4-2. Use Table 4-1 as a guide to time delay values and their corresponding adjustment DIP switch or potentiometer.

Sensor Adjustments

Voltage and frequency sensor pickup and dropout points are set to customer specifications (if none specified, standard factory settings are used). To change a setting, follow procedure on page 4-2. Use Tables 4-2 and 4-3 for settings and corresponding DIP switch actuators.

[WARNING] Any change in these settings may affect the normal operation of the automatic transfer switch. This change could allow the load circuits to remain connected to a low voltage source.

* If dropout voltage is set to 90%, the pickup voltage must be set to 95%.

(Low setting shifts all voltage settings down 4.2%; for example, 240 V to 230 V, or 480 V to 460 V)

Adjustments (continued)

[WARNING] Do not make any setting changes while the controller is energized.

How to Change a Setting

1. Prevent the transfer switch from operating by disconnecting one source first, then the other, as follows:
• a. If the transfer switch is in the Normal position, open the emergency source circuit breaker. Turn the engine starting control to off. Then open the normal source circuit breaker.
• b. If the transfer switch is in the Emergency position, open the normal source circuit breaker. Turn engine starting control to test or run. Then open the emergency source circuit breaker.
2. Disconnect both harness plugs from controller by squeezing the latches. Do not pull on the wires.
3. Remove cover from the controller by releasing latch on right side with your thumb. See Figure 4-1.
4. Locate the appropriate adjustment potentiometer or DIP switch for the setting that you want to change. Refer to Table 4-1 and Table 4-2 on page 4-1 and Figure 4-2, Figure 4-3, Figure 4-4 on page 4-2.
5. Use a small screwdriver to turn the potentiometer clockwise to increase the time delay or counterclockwise to decrease it. See Figure 4-3.
6. Use a ball-point pen (or similar pointed tool) to slide the switch actuators left or right so they match the illustration next to the setting (left = off, right = on). Recheck the setting. See Figure 4-4.
7. Install the cover on the controller by hooking it on the left side and latching the right side.
8. Reconnect both harness plugs to the controller by aligning and pressing straight in until latches click.
9. Close the enclosure door, then restore both sources:
• a. If the transfer switch is in the Normal position first close the normal source circuit breaker, then close the emergency source circuit breaker.
• b. If the transfer switch is in the Emergency position, close the normal source circuit breaker. The load will be automatically retransferred to the normal source. Then close the emergency source circuit breaker.
10. Turn the engine starting control to automatic.

Image Description: Figure 4-1 shows the controller cover latch mechanism. Figure 4-2 illustrates the location of potentiometers (P1, P2) and DIP switches (S1, S2, S3) on the controller board, including the battery and jumper. Figure 4-3 demonstrates how to change time delay potentiometers by turning them clockwise or counterclockwise. Figure 4-4 shows how to set DIP switch actuators using a pen, indicating 'off' (left) and 'on' (right) positions.

Section 5: Control Features – Engine Exercisers

These timers periodically exercise the emergency engine-generator plant. They can be set to exercise with or without load transfer, or they can be completely disabled. The engine-generator should be exercised under load once a week for a minimum time period of 20 minutes, or follow the recommendations of the engine-generator set manufacturer. Refer to page 4-2 for location of DIP switches, battery (provided), and jumper block in the controller.

Built-in Engine Exerciser

The engine exerciser included in ASCO Series 300 Automatic Transfer Switches provides a once a week 20-minute exercise period. It occurs immediately when the SET ENGINE EXERCISER push button is pressed (and held for at least 5 seconds), and then at the same time weekly thereafter. A 9 volt alkaline battery (Duracell® MN1604, Everready® 522, or Panasonic® 6AM6) is furnished and installed in the controller to maintain the setting. The battery jumper block must be shifted to the ON position. See Figure 4-2 on page 4-2.

Shaded DIP switches are standard factory settings.

Fill in day and time set. Week Day ________ Time ________.

Image Description: Figure 5-1 shows operator panel pushbuttons and status lights. It depicts the SET ENGINE EXERCISER and BYPASS TIME DELAY buttons. It explains how to press and hold the SET ENGINE EXERCISER button to set the exercise period, and how the status light indicates the process. It also notes that pressing BYPASS TIME DELAY can cancel an active exercise period.

• Press to cancel an active exercise period (stops generator).
• If Exercise with Load is set, retransfers load to Normal, then stops generator after 5 min. cooldown.

Exercise without Load, DIP Switch S1, Actuator 8 off

Exercise with Load, DIP Switch S1, Actuator 8 on

NOTE: Every time SET ENGINE EXERCISER push button is pressed (held 5 seconds) the exercise period is changed.

Control Features (continued) – Optional Programmable Engine Exerciser (Accessory 11CD)

The optional programmable engine exerciser provides seven days of different exercise periods. The timer is connected and mounted below the controller. A permanent backup battery maintains the setting; when power is lost to timer, output switch deenergizes.

Shaded DIP switches are standard factory settings.

The Accessory 11CD Programmable Engine Exerciser incorporates a 7 day time base, and therefore, each day of the week can be uniquely programmed to test the engine generator set either with or without load. The proper controller settings must be made to determine whether or not the test will be conducted with or without load (refer to page 5-1 for proper selection). For convenience, Block Programming is also provided, whereby up to seven days can be grouped together if the ON and OFF times are the same.

See next page for instructions on setting the timer.

Setting the Clock (Time and Day)

Image Description: Figure 5-2 shows the exerciser display and push buttons, including reset, program, on/off, hour, minute, and day buttons.

Changing or Checking Time Programs

By operating the Prog. button, the individual commands as programmed can, at any time, be brought consecutively into the display for revision or checking. Revisions are accomplished by programming over the existing programs using the steps at the left.

Canceling Time Programs

After selecting the desired program, use the h and m buttons to set hours and minutes to zero; the --:-- will be displayed. This program has been made ineffective and will no longer be carried out. To cancel all programs, press the Res. (reset) button. This clears all memory including the time base and program storage.

Programming Engine On-Off Period(s)

Manual Override

Daylight Savings / Standard Time Change

To change to Daylight Savings time, press the ±1h button once. Clock advances by one hour and +1h appears in display. To change to Standard Time, press the ±1h button again; the clock sets back one hour and +1h disappears.

Control Features (continued) – Inphase Monitor for Motor Load Transfer

Inphase monitoring logic controls transfer and retransfer of motor loads, so that inrush currents do not exceed normal starting currents. It avoids nuisance tripping of circuit breakers and mechanical damage to motor couplings.

The Motor Load Transfer feature is built into the controller. DIP switch S1 (actuator 5) activates this feature: right = ON, left = OFF.

Note: If the Motor Load Transfer feature is enabled, it will be activated following the Load Disconnect Feature Delay Before Transfer delay.

Load Disconnect Feature

Connect external circuits to the terminals indicated on the Wiring Diagram provided with the ATS.

The double throw (Form C) contact is rated for 28 VDC or 120 VAC (5 amps resistive). The contact operates prior to a selectable 0, 3, 10, or 20 second delay before transfer of the Automatic Transfer Switch. The contact resets either immediately following transfer or after the same delay as set for pre-signal before transfer.

Time delay between the load disconnect control signal and initiation of transfer is set on the controller with DIP switch S2 (actuators 6, 7, 8) as shown below:

Delay Before Transfer

Shaded DIP switches are standard factory settings.

Delay After Transfer*

*Enabling the Delay After Transfer will cause the control signal to reset after the same delay as set for the Delay Before Transfer.

Remote Control Features

These remote control features require a customer-supplied normally closed contact suitable for a 5 V dc low energy circuit. Refer to the Wiring Diagram provided with the ATS. Activate appropriate DIP switch S2 actuators below.

Remote Test (terminals CP6–7)

Remote Transfer to Emergency (CP8–9)

Bypass Transfer Time Delay (CP12–13)

Inhibit Transfer to Emergency (CP10–11)

Control Features (continued) – Optional Strip Heater (Accessory 44)

Accessory 44 Strip Heater is designed to keep ambient temperatures within the Automatic Transfer Switch enclosure at acceptable levels. This accessory consists of a mounting bracket with strip heater, thermostat, and terminal block. A transformer with fuses is included when the power for the assembly is derived from voltages above 120 V ac. The 120 V ac customer powered assembly does not include a transformer. This optional accessory is available factory installed or in kit form.

Turn the thermostat's dial to required setting as shown.

Image Description: Diagram of a thermostat dial for the strip heater, showing temperature settings from 30°F to 140°F. Arrows indicate turning the dial clockwise to raise temperature and counterclockwise to lower temperature.

Available Kits from ASCO

Controls

Strip Heater – Accessory 44

Index

• A
  accessories, 5-1, 5-2, 5-3, 5-5
  auxiliary circuits, 1-2
• B
  barriers, 1-3
  battery, 4-2, 5-1
  buttons, push, 3-1
  bypass time delay, 1-4, 2-1, 3-1
• C
  cable lugs, 1-1
  preparation, 1-1
  catalog number, inside cover
  cleaning, 3-1
  connections engine control contact, 1-2
  line, 1-1
  contact position indicators, 1-3
  control features, 5-1
  load disconnect, 5-4
  motor load transfer, 5-4
  plant exerciser, 5-1
  controller (control panel), 4-1, 4-2
  codes, cover
  cover removal, 4-2
  disconnecting, 3-1
  time delay potentiometers, 4-2
• D
  DIP Switches, 4-1, 4-2, 5-1, 5-2, 5-4
• E
  electrical operation, 1-4
  engine exerciser, 5-1, 5-2, 5-3
  engine starting contacts, 1-2
• F
  failure see trouble-shooting, 3-2
  features, see control features
  frequency, pickup and dropout settings, 4-1
  functional test, 1-3, 1-4, 1-5
• H
  harness, 1-2
  disconnect plugs, 3-1
• I
  inphase monitor, 5-4
  inspection, 3-1
  installation, 1-1
  insulator backing piece, 1-1
  illustration of, 1-1
  warning, 1-1
• L
  labels, engine starting contacts, 1-2
  inputs / outputs, 1-2
  rating, cover
  lights, 1-4, 5-1
  load disconnect feature, 5-4
  lubrication, 3-1
• M
  maintenance, preventive, 3-1
  manual load transfer, 3-2
  warning, 3-2
  manual operation, 1-3
  illustration of, 1-3
  warning, 1-3
  motor load transfer feature, 5-4
• N
  nameplate, cover
• O
  operation electrical, 1-4
  manual, 1-3
  illustration of, 1-3
  warning, 1-3
  sequence of, 2-1
• P
  parts, 3-1
  problem, 3-2
  programmable engine exerciser, 5-2, 5-3
• R
  rating label, inside cover
  remote control features, 5-4
  bypass transfer time delay, 5-4
  inhibit transfer to emergency, 5-4
  remote test, 5-4
  remote transfer to emergency, 5-4
  replacement parts, 3-1
• S
  set engine exerciser, 5-1
  settings changing, 4-1
  factory, 4-1
  frequency, 4-1
  phase, 4-1
  time delay, 4-1
  voltage, 4-1
• T
  terminal block, 1-2
  test, functional, 1-3, 1-4, 1-5
  time delay adjustment, 4-1
  gen-set cooldown, 4-1
  how to change, 4-2
  override momentary outages, 4-1
  settings, 4-1
  transfer to emergency, 4-1
  transfer to normal, 4-1
  timer (plant exerciser), how to set, 5-1
  transfer switch test, 1-4, 3-1
  trouble-shooting, 3-2
  inphase monitor, 5-4
• V
  voltage, phase, 4-1
  voltage, pickup and dropout settings, 4-1

©2003 ASCO Power Technologies, L.P.