Trane RTHD Troubleshooting Manual page 35

Starting Wye Delta With Contactor Integrity Test
Confirm No Transition Complete Signal
(Transition Complete Input Shorted)
Energize Start and
Stop Relays
Confirm No Compressor Currents
(Starter Fault Type I )
De-Energize Start and
Stop Relays
Starter Contactor Integrity Test
Arm/Run Command to Starter Module
Figure 14.Sequence of Operation Y-delta Start
RLC-SVD05A-EN
Starter
Energize and Hold
Shorting Relay
Confirm No Compressor Currents
(Starter Fault Type II )
Starting Compressor
Energize Stop and Start
Relays
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 )
When Currents Drop Below 85% RLA + 1 . 5
Seconds, Energize Transition Relay
De-Energize Shorting
Relay
Starting
Starting Compressor
Compressor
Starting Compressor
Transition Starter to Delta
in Wye
Max Accel Timer
(6 to 64 Seconds)
Confirm Transition Complete
Input within 2.5 seconds
(Starter Did Not Transition)
Energize Run
Contactor
De-Energize Transition
Relay
Compressor
Running
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