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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
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:
•
All temperatures below their starting limits
•
Evaporator and condenser water flowing
Figure 36. 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 in 20 Minutes
(6 Second Filter)
52
Need to Cool
(Satisfied Differential to Start)
Waiting to Start
Restart Inhibit 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
• MBC Bearing Temps <90% of
Cutout
•
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 45 seconds.
Waiting to Start
MBC Clearance Check and
Levitate Bearings (~10 Seconds)
Confirm Condenser Water Flow
(6 Second Filter)
MBC Clearance Check
(if MBC Clearance Check =
Enabled)
Levitate Bearings
Energize Condenser
Water Pump Relay
Confirm Cond Water
Flow in 20 Minutes
(6 Second Filter)
Evaporator EXV
Pre-position
Starting
Starting
AFD Parking
(~8 Seconds)
MBC Cooling
Valve Closed
Economizer Valve
Closed
Drive Cooling
Valve Closed
Motor Cooling
Valve Closed
IGV Closed
(Except for Rapid Restart)
HDWA-SVX001D-EN
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