HDWA-SVX001D-EN
51
Power Up to Starting
The following figure shows the timing from a power up
event to energizing the compressor. The shortest
allowable time would be under the following
conditions:
•
All temperatures below their starting limits
•
Evaporator and condenser water flowing
•
Power up start delay setpoint set to 0 minutes
•
Need to cool
The above conditions would allow for a minimum
power up to starting compressor time of 45 seconds.
Figure 35.
Sequence of events: power up to starting
Last Chiller Mode
Was Auto
Call for Cooling
Auto
Waiting to Start
Waiting to Start
Levitate Bearings
Energize Condenser
Water Pump Relay
Evaporator EXV
Pre-position
Overdrive
IGV Closed
Energize Evaporator
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 Minutes
(6 Second Filter)
Confirm Condenser Water
Flow Within 20 Minutes
(6 Second Filter)
Power
Applied
to
Controls
Starting
Compresor
Wait for Condenser Water Flow
(6 Second Filter)
Wait for Evaporator
Water Flow
UC800
Boot Time
(30 to 50
Seconds)
Enforce Power-up
Start Delay Timer
(0 to 30 Minutes)
Temperature Checks:
• Motor Winding Temp <90%
of the Motor Winding Temp
Cutout
• AFD Heatsink Temp <90%
of the AFD Heatsink Temp
Cutout
• MFC PCB Temp <90% of the
PCB Temp Cutout
• Compressor Bearing Temps
<90% of the Cutout
Check MBC
Parameter
Table Set
Overdrive All
EXVs Closed
MBC Clearance Check
Send Run
Command to
AFD
