Table of Contents
Advertisement
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
Figure 35. Sequence of events: power up to starting
Power
Applied
to
Controls
Wait for Evaporator
UC800
Boot Time
(30 to 50
Seconds)
Check MBC
Parameter
Table Set
Overdrive All
EXVs Closed
Overdrive
IGV Closed
HDWA-SVX001D-EN
Last Chiller Mode
Was Auto
Call for Cooling
Auto
Waiting to Start
Water Flow
Temperature Checks:
Enforce Power-up
• Motor Winding Temp <90%
Start Delay Timer
of the Motor Winding Temp
(0 to 30 Minutes)
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
Energize Evaporator
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 Minutes
(6 Second Filter)
S S t t a a r r t t - - u u p p a a n n d d S S h h u u t t - - d d o o w w n n
•
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.
Waiting to Start
Wait for Condenser Water Flow
(6 Second Filter)
MBC Clearance Check
Levitate Bearings
Energize Condenser
Water Pump Relay
Confirm Condenser Water
Flow Within 20 Minutes
(6 Second Filter)
Evaporator EXV
Pre-position
Starting
Compresor
Send Run
Command to
AFD
51
Advertisement
Table of Contents
