Altistart 48 Panel-Mount Soft Starts: Recommended Wiring Diagrams
Reversing with Isolation Contactors Wiring Diagram
The diagram illustrates a reversing starter configuration using isolation contactors (IC1 for forward, IC2 for reverse), a shorting contactor (SC), and the ATS48 soft start unit. It includes AC line supply (L1, L2, L3) connected through fuses (FU5, FU6, FU7) to the isolation contactors. The motor (M) is connected to the output of the isolation contactors. A shorting contactor (SC) is also shown, intended to bypass the soft start at full speed. The ATS48 Soft Start unit is central to the control logic. The diagram details control wiring for various scenarios, including 120V control power, motor thermal switch, and different operator control inputs (2-wire, 3-wire, auto/manual direction).
Detail A shows the control wiring for RUN FORWARD and RUN REVERSE, indicating connections for Hand/Auto, Forward/Reverse, and Remote Start.
Notes for Wiring Diagram
- 1: Connect control power transformer for 120 V secondary voltage.
- 2: For shorting contactor operation, add SC with associated circuitry.
- 3: Relay contact located on ATS48 controller.
- 4: Located at motor. Jumper if switch not present.
- 5: Set RFR time slightly longer than the expected deceleration time from rated forward speed to zero speed.
- 6: Set RRR time slightly longer than the expected deceleration time from rated reverse speed to zero speed.
- 7: Remove these contacts to inhibit direction reversal without first depressing STOP push button.
- * = User supplied
Description of Logic for Recommended Wiring Diagrams
| Item | Name | Description |
|---|---|---|
| IC1 IC1A | Isolation Contactor (Fwd) | The isolation contactor logic closes IC1 upon a start command and opens IC1 after the stop is complete. The RCR (or RFR and RRR for reversing) are timed contacts that must have a time delay greater than the deceleration ramp time or the braking time. When a coast stop is selected, the time delay must be set for a time that will allow a complete decay of the motor residual voltage. The isolation contactor will open immediately upon a fault. The pilot relay (IC1A) is required when the IC1 contactor coil exceeds the ATS48 relay output ratings. |
| IC2 IC2A | Isolation Contactor (Rev) | Used for reversing applications only, the IC2 must be mechanically interlocked to IC1. A reversing contactor may be used for the combination of IC1 and IC2. In general, the operation of IC2 is identical to IC1. The pilot relay (IC1A) is required when the IC1 contactor coil exceeds the ATS48 relay output ratings |
| SC SCA | Shorting Contactor & Pilot Relay | The shorting contactor is used to reduce the heat dissipated by the soft start when the motor is operating at full speed and voltage. The soft start provides proper sequencing of this contactor by the "end-start-up" relay. When the start is completed, the shorting contactor will be commanded to close. The soft start will continue to monitor the motor thermal state and provide motor overload protection. Upon a stop command, the SC contactor will open, transferring the motor current to the ATS48 soft start to allow for controlled deceleration if desired. The pilot relay (SCA) is required when the SC contactor coil exceeds the ATS48 relay output ratings. |
| TS | Transient Suppressors | Transient suppression of all relay and contactor coils (except ST) is recommended to minimize the possibility of electrical interference with the soft start electronics and to increase relay contact life. |
| RCR | Run Command Relay | Used in shunt trip fault isolation installations only if 120 V control of the ATS48 soft start is required. |
| RFR | Run Forward Relay | Used in non-reversing installations with a isolation contactor for proper sequencing of contactor logic. When energized, RCR initiates the start sequence. When de-energized, stopping is initiated. Operator controls can be either on/off selector switch, HOA selector switch or start/stop push buttons. RCR remains energized during a fault. Once the fault condition has been cleared, RCR must be de-energized by a "stop" command then re-energized to restart the soft start. |
| RRR | Run Reverse Relay | Used for reversing applications only, this coil duplicates the functionality of RCR for the forward direction and is interlocked with the RFR relay. |
| ST | Shunt Trip Coil | Used for reversing applications only, this coil duplicates the functionality of RCR for the reverse direction and is interlocked with the RRR relay. |
| TR | Trip Relay | This coil is attached to the shunt trip coil on the disconnect and will energize 2 seconds after a soft start fault by the TR timer contact. The time delay is to prevent nuisance tripping of the circuit breaker during soft start power-up or during line undervoltage conditions. |
| FR | Fault Relay | Used in shunt trip circuit breaker logic only; coil energized upon a soft start fault. The fault relay is energized during normal operation and deenergizes if the soft start fault contacts open or if the motor thermal switch (if supplied) opens. FR also provides additional contacts for the soft start fault output. |
Suggested Components for Standard Duty Applications
Induction Motor
| Rated hp (1) | 208 V | 230 V | 460 V | 575 V | ATS48 Soft Start Model | Device Rated Current @ 40 °C (104 °F)(2) | ATS Control Power Burden (W) | Class CC 600 V Time Delay @115 V |
|---|---|---|---|---|---|---|---|---|
| 3 | 5 | 10 | 15 | ATS48D17Y | 17 | 25 | 0.5 A | |
| 5 | 7.5 | 15 | 20 | ATS48D22Y | 22 | 25 | 0.5 A | |
| 7.5 | 10 | 20 | 25 | ATS48D32Y | 32 | 30 | 0.6 A | |
| 10 | -- | 25 | 30 | ATS48D38Y | 38 | 30 | 0.6 A | |
| 15 | -- | 30 | 40 | ATS48D47Y | 47 | 30 | 0.6 A | |
| 15 | 20 | 40 | 50 | ATS48D62Y | 62 | 30 | 0.6 A | |
| 20 | 25 | 50 | 60 | ATS48D75Y | 75 | 30 | 0.6 A | |
| 25 | 30 | 60 | 75 | ATS48D88Y | 88 | 30 | 0.6 A | |
| 30 | 40 | 75 | 100 | ATS48C11Y | 110 | 30 | 0.6 A | |
| 40 | 50 | 100 | 125 | ATS48C14Y | 145 | 30 | 0.6 A | |
| 50 | 60 | 125 | 150 | ATS48C17Y | 170 | 30 | 0.6 A | |
| 60 | 75 | 150 | 200 | ATS48C21Y | 210 | 50 | 1 A | |
| 75 | 100 | 200 | 250 | ATS48C25Y | 250 | 50 | 1 A | |
| 100 | 125 | 250 | 300 | ATS48C32Y | 320 | 50 | 1 A | |
| 125 | 150 | 300 | 350 | ATS48C41Y | 410 | 80 | 1.5 A | |
| 150 | -- | 350 | 400 | ATS48C48Y | 480 | 80 | 1.5 A | |
| -- | 200 | 400 | 500 | ATS48C59Y | 590 | 80 | 1.5 A | |
| 200 | 250 | 500 | 600 | ATS48C66Y | 660 | 80 | 1.5 A | |
| 250 | 300 | 600 | 800 | ATS48C79Y | 790 | 80 | 1.5 A | |
| 350 | 350 | 800 | 1000 | ATS48M10Y | 1000 | 80 | 1.5 A | |
| 400 | 450 | 1000 | 1200 | ATS48M12Y | 1200 | 80 | 1.5 A |
Notes:
(1) Motor full load currents through 500 hp @ 460/575 V, 250 hp @ 230 V, and 200 hp @ 208 V are taken from the National Electric Code (NFPA 70-2002, Table 430.150). Above these ratings, motor full load currents are calculated based upon 1.2 A/hp for 460 V and 2.4 A/hp for 230 V. Motors listed are for standard duty applications. For severe duty applications, select the next larger soft start size.
(2) The ambient temperature indicated in the table represents the temperature of the air surrounding the ATS48 soft start. Any additional temperature factors associated with the enclosure system or actual installation ambient temperature must be considered when determining the actual rated current (ICL) of the soft start. For operating ambient above 40 °C (104 °F) without a shorting/bypass contactor and 50 °C (122 °F) with a shorting/bypass contactor but not exceeding 60 °C (140 °F), the rated current (ICL) of the soft start must be de-rated by 2% per °C.
NOTE: To select control operators (push buttons, pilot lamps, and selector switches), control power transformers, and wire management devices (control and power terminal strips, wire terminations) indicated on the recommended wiring diagram configurations, visit www.us.squared.com.
Additional Suggested Components for Standard Duty Applications
| ATS48 Soft Start Model | Contactors (1), (2), (3) | Disconnect (4) | Fusible Disconnect | Fuse Block (6) | Molded Case Switch (7) | Circuit Breaker Thermal Magnetic (7) | ||
|---|---|---|---|---|---|---|---|---|
| IC1 Isolation Contactor | IC2 Reversing Contactor (5) | Mechanical Interlock | SC Shorting Contactor (AC1) Class/Rating | Power Fuses | ||||
| D17Y | LC1D09 | LC1D09 | (8) | LC1D09 J / 25 | 60308J | FHL36000M | FAL36030 | |
| D22Y | LC1D18 | LC1D18 | (8) | LC1D18 J / 30 | 60308J | FHL36000M | FAL36040 | |
| D32Y | LC1D25 | LC1D25 | (8) | LC1D25 J / 40 | 60608J | FHL36000M | FAL36050 | |
| D38Y | LC1D32 | LC1D32 | (8) | LC1D32 J / 50 | 60608J | FHL36000M | FAL36060 | |
| D47Y | LC1D40 | LC1D40 | (8) | LC1D40 J / 60 | 60608J | FHL36000M | FAL36080 | |
| D62Y | LC1D50 | LC1D50 | (8) | LC1D50 J / 80 | 61038J | FHL36000M | FAL36090 | |
| D75Y | LC1D80 | LC1D80 | (8) | LC1D80 J / 100 | 61038J | FHL36000M | FAL36100 | |
| D88Y | LC1D80 | LC1D80 | (8) | LC1D80 J / 120 | 62003J | KHL36000M | KAL36110 | |
| C11Y | LC1D115 | LC1D115 | (8) | LC1D115 J / 150 | 62003J | KHL36000M | KAL36150 | |
| C14Y | LC1D115 | LC1D115 | (8) | LC1D115 J / 200 | 62003J | KHL36000M | KAL36200 | |
| C17Y | LC1F150 | LC1F150 | LA9FF970 | LC1F150 J / 225 | 64033J | LHL36000M | LAL36225 | |
| C21Y | LC1F185 | LC1F185 | LA9FG970 | LC1F185 J / 300 | 64033J | LHL36000M | LAL36250 | |
| C25Y | LC1F225 | LC1F225 | LA9FJ970 | LC1F225 J / 350 | 64033J | LHL36000M | LAL36350 | |
| C32Y | LC1F330 | LC1F330 | LA9FJ970 | LC1F330 J / 400 | 64033J | LHL36000M | LAL36400 | |
| C41Y | LC1F400 | LC1F400 | LA9FJ970 | LC1F400 J / 500 | 6633J | MHL36000M | MAL36500 | |
| C48Y | LC1F500 | LC1F500 | LA9FJ970 | LC1F500 J / 600 | 6633J | MHL360006M | MAL36600 | |
| C59Y | LC1F500 | LC1F500 | LA9FJ970 | LC1F500 L / 700 | (6) | MHL360008M | MAL36800 | |
| C66Y | LC1F630 | LC1F630 | LA9FJ970 | LC1F630 L / 900 | (6) | MHL360008M | MAL36900 | |
| C79Y | LC1F630 | LC1F630 | LA9FL970 | LC1F630 L / 1100 | (6) | MHL36000M | (9) | |
| M10Y | LC1F780 | LC1F780 | LA9FL970 | LC1F780 L / 1350 | (6) | MHL36000M | (9) | |
| M12Y | LC1F780 | LC1F780 | LA9FX970 | LC1F780 L / 1600 | (6) | NCL3600012M | (9) | |
Footnotes:
(1) All coils are selected for 120 V, 60 Hz operation. Refer to the Digest for additional coil voltages or auxiliary contact configurations. One block may be added to each contactor.
(2) Power terminals are not included with LC1-F contactors. For additional ordering information visit www.us.squared.com.
(3) The use of transient suppressors across all contactor coils is recommended. Refer to the latest editions of Schneider Electric's full line product catalogs for selection of transient suppressors.
(4) According to the National Electric Code, branch circuit overcurrent protection must be provided for each soft start. Short circuit protective devices recommended in this table are within NEC requirements for Type 1 coordination.
(5) Reversing contactors for C11 through M12 soft starts must be assembled from components. Parts quantities for a basic contactor assembly, minus the power connection links and terminals, are indicated before each part number. Refer to the latest editions of Schneider Electric's full line product catalogs for power connector link and terminal kits. Reversing contactor interlock units used for the C79 through M12 soft starts are designed for vertical interlocking of the individual contactors. Horizontally interlocked contactors are used for D17 through C59 soft starts.
(6) Fuse holder part number references are for Class J fuses only based on Ferraz Shawmut spring reinforced with box type connectors acceptable for Al/Cu wiring. Class L fuses require bolt-on connections to user-supplied power bus work.
(7) The molded case switches and circuit breakers selected require the addition of operator mechanisms to allow operation from the exterior of an enclosure. Refer to the latest editions of Schneider Electric's full line product catalogs for operator mechanism information. When using a shunt trip relay for SCR fault isolation, order a disconnect switch with suffix -1021 for addition of shunt trip coil.
(8) The D Line contactor is available as a reversing configuration. For these applications, change the IC1 part number prefix from LC1- to LC2- to order the IC1 and IC2 combination complete with mechanical interlocks.
(9) Devices rated above 660 A have not been coordinated with circuit breakers. You must use a Class L fuse for overcurrent protection with ATS48 soft start models C79, M10, and M12.
