ASCO Series D386 Non-Automatic Transfer Switches
Wiring and Specifications (30-230 Amperes with Group I Controls)
General Notes
- Factory settings for DIP switches S1, S2, and S3 are detailed.
- Device symbols and designations follow NEMA Publication ICS 1-1983.
- All wiring is #16 AWG tinned, stranded copper unless otherwise noted.
- 'O' on terminal blocks indicates available field connection; '•' indicates factory connection.
- Control and accessory wiring follows ASCO Assembly Procedure GS451261.
- An Operator's Manual is supplied with each transfer switch; refer to it prior to installation and operation.
- Ground strap on the control panel is affixed to the chassis at the lower left control panel mounting stud.
- Warning: Changes to DIP switch settings may affect normal operation.
Features
- Selector Switch (SS): A three-position, momentary, spring-return-to-center switch for manual transfer to Normal and Emergency sources.
- Auxiliary Contacts (Feature 14A & 14B): Two sets of Form C contacts (1 N/O & 1 N/C each) indicating connection to Normal (14A) and Emergency (14B) sources. Rated 10 Amps, 32VDC, 480VAC.
- Indicator Lights:
- PL1 (Green LED): Indicates when the transfer switch is connected to the Normal source (Standard Feature 9A).
- PL2 (Red LED): Indicates when the transfer switch is connected to the Emergency source (Standard Feature 9B).
- Output Contacts (NR): One set of Form C contacts (1 N/O & 1 N/C) that change position upon expiration of the Normal source outage delay and reset after the unload timer (engine cool down) expires. Rated 5 Amps resistive at 28V DC or 120V AC maximum.
Optional Accessories
- ACC 72A - Serial Communications Option: RS-485 serial interface for remote monitoring and control from ASCO communications-based products. Requires specific wiring (Data+, Data-, Shield) and cable types (e.g., Belden 9842/9829 or Alpha 6202C/62220).
- ACC 6Q - Key Operated Transfer Control Switch: For transferring to Normal or Emergency. Three-position, momentary, spring-return-to-center, with key removable in the center position.
- ACC 9C - Signal Light (PL3 Green LED): Indicates Normal source availability.
- ACC 9D - Signal Light (PL4 Red LED): Indicates Emergency source availability.
- ACC 27 - Inphase Transfer Control Logic: Initiates inphase transfer of loads between live sources to prevent nuisance tripping of circuit breakers and damage to mechanical loads.
- ACC 31 - Time Delay Before Transfer: One set of Form C contacts (1 N/O & 1 N/C) that change position upon activation of a selectable time delay before transfer (LD TDBT). Delay is selectable as 0, 3, 10, or 20 seconds. Factory set at 0.
- ACC 37B - Extension Harness: 72 inches (1828mm) long, for units shipped open to accommodate customer mounting of controls and switch.
- ACC 43M - Customer Supplied Selector Switch Provisions: For customer-supplied 3-position selector switch with positions for Local Control Enable, Remote Control Transfer to Normal, and Remote Control Transfer to Emergency.
Catalog Number Explanation
| CATALOG NUMBER CODES | CODE | DESCRIPTION |
|---|---|---|
| BASE CATALOG NUMBER | 386 | SERIES D386 TS, 3PH, 30-230 AMPS "D" FRAME, GROUP 1 CONTROLS |
| FRAME TYPE | D | "D" FRAME |
| TYPE | TS | TRANSFER SWITCH |
| POLES | 3 | 3-POLE |
| AMPS | 30, 70, 100, 150, 200*, 230* | CURRENT RATING |
| VOLTAGE | 208, 220, 230, 240, 380, 400, 415, 440, 460, 480, 550*, 575*, 600* | NOMINAL VOLTAGE |
| CONTROLLER | GROUP 1 | CONTROL TYPE |
| OPTIONAL ENCLOSURE | BLANK (OPEN TYPE), 3R (OUTDOOR), 4 (INDOOR/OUTDOOR) | ENCLOSURE TYPE |
| CATALOG NUMBER SUFFIXES | (Various Codes) | ACCESSORY CODES |
| NEUTRAL TYPE | BLANK (NONE), C (SOLID SWITCHING), B (OVERLAPPING) | NEUTRAL CONFIGURATION |
| PHASE (3 OR 4 WIRE) | 3 | 3-PHASE |
| CERTIFIED TO | (Various Codes) | (Not specified in detail here) |
Wiring Diagrams and Descriptions
Main Power Poles (Page 2)
This diagram illustrates the main power connections. It shows incoming lines for the EMERGENCY source (EA, EB, EC, EN) and the NORMAL source (NA, NB, NC, NN). The LOAD is connected via terminals LA, LB, LC, LN. The diagram also indicates optional neutral configurations: Optional Switching Neutral, Optional Overlapping Neutral, and a note referring to Sheet 1 for details on None, Solid Bus Plate, Switching, and Overlapping Contacts.
TS Operator Circuit (Page 2)
This schematic depicts the control circuit for the transfer switch (TS) operator. It shows connections from the Control Panel (CP) to the TS for both Normal and Emergency power sources, including solenoid coils (CR, CR) and associated terminals (e.g., TS-19, TS-20, TS-21, TS-22, TS-EN, TS-NN, TS-LN).
Wire Run Listing (Page 3)
This section provides detailed wire routing information, listing wire numbers, harness locators, and connections between the main transfer switch (TS), the control panel (CP), and door controls/indicators. It includes tables for different harness types (e.g., Harness 337782-003, Harness 483763, Harness 619510-037).
Harness 337782-003 (Main TS to Control Panel)
| WIRE No. | (P) MAIN TS | CLR | AWG | WIRE No. | (J,CP-P1,CP-P2) CONTROL PANEL | CLR | AWG |
|---|---|---|---|---|---|---|---|
| 1 | TS-8,P- | 16 | TS-8,P- | 1 | J-1,CP-P1-8 | 16 | |
| 2 | TS-A,P-2 | 2 | J-2,CP-P1-15 | ||||
| 3 | TS-6,P-3 | 3 | J-3,CP-P1-2 | ||||
| 4 | TS-3,P-4 | 4 | J-4,CP-P1-4 | ||||
| 5 | TS-B,P-5 | 5 | J-5,CP-P1-17 | ||||
| 6 | TS-5,P-6 | 6 | J-6,CP-P1-12 | ||||
| 7 | TS-4,P-7 | 7 | J-7,CP-P1-7 | ||||
| 8 | TB-14,P-8 | 8 | J-8,CP-P2-2 | ||||
| 9 | TB-15,P-9 | 9 | J-9,CP-P2-3 | ||||
| 10 | TS-17,P-10 | 10 | J-10,CP-P2-8 | ||||
| 11 | TS-2,P-11 | 11 | J-11,CP-P1-10 | ||||
| 12 | TS-1,P-12 | 12 | J-12,CP-P1- | ||||
| 13 | TS-16,P-13 | 13 | J-13,CP-P2-9 | ||||
| 14 | TS-18,P-14 | 14 | J-14,CP-P2-10 | ||||
| 15 | TS-70,P-15 | 15 | J-15,CP-P1-5 | ||||
| 16 | TS-72,P-16 | 16 | J-16,CP-P1-13 | ||||
| 17 | TS-4,TS-9 | 24 | TS-4,TS-9 | 17 | J-17,CP-P2-1 | ||
| 18 | TS-7,TS-1 | 25 | TS-7,TS-1 | 18 | J-18,CP-P1-14 | ||
| 19 | TS-3,TS-69 | 20 | TS-3,TS-69 | 19 | J-19,CP-P2- | ||
| 20 | TS-5,TS-71 | 21 | TS-5,TS-71 | 20 | J-20,CP-P1- | ||
| 21 | TS-14,TB-14 | 8 | TS-14,TB-14 | 21 | J-21,CP-P2- | ||
| 22 | TS-15,TB-15 | 9 | TS-15,TB-15 | 22 | J-22,CP-P2- | ||
| 23 | ADD WIRES | 23 | J-23,CP-P2- | ||||
| 24 | TB-16,P-17 | 26 | TB-16,P-17 | 24 | J-24,CP-P2- | ||
| 25 | TS-19,P-18 | 25 | TS-19,P-18 | ||||
| 26 | TS-20,P-19 | 26 | TS-20,P-19 | ||||
| 27 | TS-21,P-20 | 27 | TS-21,P-20 | ||||
| 28 | TS-22,P-21 | 28 | TS-22,P-21 | ||||
| 29 | TS-NN,P-22 | 29 | TS-NN,P-22 | ||||
| 30 | TS-EN,P-23 | 30 | TS-EN,P-23 | ||||
| 31 | TS-LN,P-24 | 31 | TS-LN,P-24 |
Optional ACC. 11CD CKTS.
| WIRE No. | (TMR) | CLR | AWG | HARNESS LOCATOR | (P3) DOOR CONTROLS & INDICATORS | CLR | AWG |
|---|---|---|---|---|---|---|---|
| 28 | CP-4,TMR-3 | 16 | P3-5,PL1(-) | 22 | |||
| 29 | CP-5,TMR-5 | P3-8,PL1(+) | |||||
| 30 | CP-14,TMR-2 | P3-6,PL2(-) | |||||
| 31 | CP-15,TMR-1 | P3-7,PL2(+) | |||||
| P3-9,PL3(-) * SEE NOTE | |||||||
| P3-10,PL4(-) * | |||||||
| P3-11,PL3(+)* | |||||||
| PL3(+),PL4(+)* | |||||||
| 147 | CP-6,SS-13 | P3-11,PL3(+)* | |||||
| 148 | CP-10,SS-23 | P3-11,PL3(+)* | |||||
| 149 | CP-7,SS-14 | P3-11,PL3(+)* | |||||
| 149 | SS-14,SS-24 | P3-11,PL3(+)* | |||||
| NOTE: CONNECTIONS ARE OPTIONAL FOR ACC. 9C, 9D. | |||||||
Optional ACC. 6Q WITH 6Q KEY OPTION
| WIRE | HARNESS 619510-037 | WITH 6Q KEY OPTION | REMOVE WIRES | ADD WIRES |
|---|---|---|---|---|
| No. | (P3) DOOR CONTROLS & INDICATORS | CLR AWG | ||
| 147 | CP-6,SS-13 | CP-6,SS-13 | CP-6,SS-1NO | |
| 148 | CP-10,SS-23 | CP-10,SS-23 | CP-10,SS-2NO | |
| 149 | CP-7,SS-14 | CP-7,SS-14 | CP-7,SS-1COM | |
| 149 | SS-14,SS-24 | SS-14,SS-24 | SS-1COM,SS-2COM |
Normal Source Circuits (Page 3)
This diagram shows the connections for the NORMAL SOURCE. It includes three phase lines (L, N) and sensing lines (PV) from the Normal source to the Control Panel (CP). The transfer switch (TS) is shown connected to these lines.
Emergency Source Circuits (Page 3)
This diagram shows the connections for the EMERGENCY SOURCE. It includes three phase lines (L, N) and sensing lines (PV) from the Emergency source to the Control Panel (CP). The transfer switch (TS) is shown connected to these lines.
Load Terminal Circuits (Page 3)
This diagram shows the connections for the LOAD. It includes three phase lines (L, N) and sensing lines (PV) from the Load to the Control Panel (CP). The transfer switch (TS) is shown connected to these lines.
Control Signals & Indication (Page 3)
This section details the control signals and indications. It shows connections from the Control Panel (CP) to the Transfer Switch (TS) for transfer commands. Indicator lights PL1 (Load Connected to Normal) and PL2 (Load Connected to Emergency) are shown with their respective connections. Optional indicator lights PL3 (Normal Source Available) and PL4 (Emergency Source Available) are also shown, along with Selector Switch (SS) connections for Normal, Center, and Emergency positions.
Physical Diagram and Operator Controls (Page 4)
This diagram provides a physical overview of the transfer switch enclosure. It shows the layout of the transfer switch (TS), the Group 1 Control Panel (CP), and the operator controls on the inside of the door.
Operator Controls Description
- PL1: Green LED indicating TS connected to Normal.
- PL2: Red LED indicating TS connected to Emergency.
- PL3: Green LED indicating Normal Source Available (Optional ACC. 9C).
- PL4: Red LED indicating Emergency Source Available (Optional ACC. 9D).
- SS: Selector Switch for transfer control (Test, Normal, Emergency). Includes connections for optional ACC. 6Q (Key Operated) and ACC 43M (Customer Supplied).
Control Panel Connections
The diagram shows the Group 1 Control Panel with its various terminal blocks (TB) and connectors (P1, J1, P2, J2, CP-J4, CP-P4) for connecting to the transfer switch, power sources, load, and accessories.
Accessory Connections
ACC 72A Serial Communication Module: Shown with connections (72A-P1, 72A-J1, 72A-J2) for serial communication, typically RS-485.
ACC 43M Customer Supplied Selector Switch: Provisions for integrating a customer-provided selector switch.
