Trane CVGF500 Installation, Operation & Maintenance Manual page 101

11. The starter module must now confirm closure of the transition complete contact
An MMR diagnostic will be generated if the transition complete contacts (2K2-AUX) do
not close.
Now that the compressor motor (4M1) is running in the "Delta" configuration, the in-
let guide vanes will modulate, opening and closing to the chiller load variation by op-
eration of the stepper vane motor actuator (4M2) to satisfy chilled water setpoint. The
chiller continues to run in its appropriate mode of operation: Normal, Softload, Limit
Mode, and so forth If the chilled water temperature drops below the chilled water set
point by an amount set as the "differential to stop" setpoint, a normal chiller stop se-
quence is initiated as follows:
1.
2. After the 50 seconds has elapsed, the stop relay (2A1¬J10) and the condenser wa-
If the <STOP> key is pressed on the operator interface, the chiller will follow the same
stop sequence as above except the chilled water pump relay (1A5¬J2) will also open
and stop the chilled water pump after the chilled water pump delay timer has timed
out after compressor shut down.
If the "Immediate Stop" is initiated, a panic stop occurs which follows the same stop
sequence as pressing the <STOP> key once except the inlet guide vanes are not se-
quence closed and the compressor motor is immediately turned off.
CVGF-SVX03B-EN
(2K2- AUX) within 2.32 to 2.38 seconds after the run relay (2A1-J6) is closed. Final-
ly, the transition relay (2A1-J2) is opened de-energizing the transition contactor
(2K4) and the compressor motor starting sequence is complete.
The inlet guide vanes are driven closed for 50 seconds.
ter pump relays (1A5-J2) open to turn off. The oil pump motor (4B3) will continue
to run for 1 minute post-lube while the compressor coasts to a stop. The chilled
water pump will continue to run while the Main processor module (1A22) moni-
tors leaving chilled water temperature preparing for the next compressor motor
start based on the "differential to start" setpoint.
Control System Components
101