Altistart 48 Enclosed Altistart 48 Soft Starters Page 35 Wiring Diagrams

35 Altistart 48 soft starters for asynchronous motors Description of components Wiring Diagrams Description of components in 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 event. 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 and Pilot Relay The shorting contactor is used to reduce the heat dissipated by the soft starter when the motor is operating at full speed and voltage. The soft starter 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 starter 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 starter 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 starter 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 starter is required. 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 event. Once the fault condition has been cleared, RCR must be de-energized by a "stop" command then re-energized to restart the soft starter. RFR Run Forward Relay Used for reversing applications only, this coil duplicates the functionality of RCR for the forward direction and is interlocked with the RFR relay. RRR Run Reverse Relay Used for reversing applications only, this coil duplicates the functionality of RCR for the reverse direction and is interlocked with the RRR relay. ST Shunt Trip Coil This coil is attached to the shunt trip coil on the disconnect and will energize 2 seconds after a soft start detected fault by the TR timer contact. The time delay is to prevent nuisance tripping of the circuit breaker during soft starter power-up or during line undervoltage conditions. TR Trip Relay Used in shunt trip circuit breaker logic only; coil energized upon a soft starter detected fault. FR Fault Relay The fault relay is energized during normal operation and de-energizes if the soft starter detected fault contacts open or if the motor thermal switch (if supplied) opens. FR also provides additional contacts for the soft starter fault output.

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