Stopped To Starting; Starting Wye-Delta - Trane Optimus RTHD Installation, Operation And Maintenance Manual

Start-Up and Shutdown

Stopped to Starting

The stopped to starting diagram shows the timing from a
stopped mode to energizing the compressor. The shortest
allowable time would be under the following conditions:
• No motor restart inhibit
• Evaporator and Condenser Water flowing
Figure 28. Sequence of events: stopped to starting
Chiller Mode
Set to Auto
Stopped
Or
Auto
Run
Inhibit
Confirm Evaporator
Water Flow
(6 Second Filter)
Energize Evaporator
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 minutes
(6 Sec Filter)
Oil Heater always ene rgized
when compressor is d e -
energized

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
Confirm No Transition Complete Signal
(Transition Complete Input Shorted)
Energize Start and
Stop Relays
Confirm No Compressor Currents
(Starter Fault Type I )
Starter Contactor Integrity Test
Arm/Run Command to Starter Module
60
Call for
Cooling
Waiting Waiting
to Start to Start
Enforce Restart
Confirm Condenser
Inhibit Timer
Water Flow
(0 to 30 mins)
(6 Second Filter)
Enforce 'Cond
Pmp Strt Delay'
(0 to 300 Sec)
Energize Condenser
Water Pump Relay
Confirm Condenser Water
Flow Within 20 minutes
(6 Sec Filter)
De-Energize Start and
Stop Relays
Energize and Hold
Shorting Relay
Confirm No Compressor Currents
(Starter Fault Type II )
Starting Compressor
• Power up Start Delay Timer has expired
• Adjustable Stop to Start Timer has expired
• Need to cool
The above conditions would allow the compressor to start
in 60 seconds.
Waiting Waiting
to Start to Start
Condense r Enforce 'Cprsr Confirm Presence of Oil
Water Pump Strt Delay'
Pre-Run (0 to 300 Sec)
(0 to 30 mins)
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
Energize Run
Contactor
Starting
Starting Compressor
Compressor
Starting Compressor
Transition Starter to Delta
in Wye
Max Accel Timer
(6 to 64 Seconds)
Starting
Waiting
Compressor
to Start
With Optical Oil Sensor
(0 to 2 mins)
Energize Unload
Solenoid
Pre-Position EX V
Confirm Transition Complete
Input within 2.5 seconds
(Starter Did Not Transition)
De-Energize Transition
Relay
Compressor
Running
RTHD-SVX01K-EN