Trane Optimus RTHD - Starting Sequence: Wye-Delta

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RTHD-SVX01L-EN
Starting Wye-Delta
The Starting Wye-Delta shows the order of operation for
this type of starter.
Figure 29. Sequence of events: Starting wye-delta
Arm/Run Command to Starter Module
Energize Start and
Stop Relays
Energize Stop and Start
Relays
Confirm No Compressor Currents
(Starter Fault Type I )
Confirm No Transition Complete Signal
(Transition Complete Input Shorted)
De-Energize Start and
Stop Relays
Energize and Hold
Shorting Relay
Confirm No Compressor Currents
(Starter Fault Type II )
When Currents Drop Below 85% RLA +1. 5
Seconds, Energize Transition Relay
De-Energize Shorting
Relay
Energize Run
Contactor
De-Energize Transition
Relay
Confirm Transition Complete
Input within 2.5 seconds
(Starter Did Not Transition)
Starting Compressor
Max Accel Timer
(6 to 64 Seconds)
Starting Compressor
Starting
Compressor
Compressor
Running
Confirm Proper Compressor Rotation
within 0.3 seconds (Phase Reversal)
and > 5% RLA (Phase Loss)
Confirm > 10% RLA Compressor
Currents within 1.6 se conds
(Starter Fault Type III )
Starter Contactor Integrity Test
Starting Compressor
in Wye
Transition Starter to Delta
Start-Up and Shutdown