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9. Auto recovery from power failures (customization)
When the Run/Stop input is a pulse signal, the unit can be customized to support auto recovery from power
failures. (When a Continuous signal is used, this custom option is not available since the unit keeps track of the
ON/OFF state of the make signal.) Times from 2 sec. to 10 min. can be selected for auto recovery from power
failure. For details, contact Toshiba Carrier.
<If recovery from power failures does not support customization>
The operation of the heat pump and module controller at the time of a power failure is as follows,
depending on the power failure time.
[Less than 20 msec
→
Power failure of duration within 20 msec is not considered as power failure and
operation continues]
[Less than 50 msec
→
For power failure of duration between 20 msec and 50 msec, operation is
temporarily stopped, but is automatically restored]
[50 msec or more
→
Power failure of duration 50 msec or more is considered a power failure and the
equipment shuts down. Manual reset (external signal required)]
Note 1: The above times are approximate.
Note 2: Auto recovery of module controller from power failure is possible with customization. (In the
Unit or External mode)
Power supply
condition
Power on
Power failure
(20 msec)
Power on (power rec ov ery )
Run
Run
Operating c ondition c ontinues
Pump
Run
Built-in pump c ontinues operation
Compressor
Run
Compres s or operation continuous operation
Power failure
20 ms ec
Power supply
condition
Power on
Power on (power recov ery )
Run
Run
Stoppage s tatus
Operating c ondition c ontinues
Pump
Run
Built-in pump s hutdown
Shutdow n for
appr ox. 5 sec
After power rec overy : The built-in pump s tarts approx imately 5 s ec later
Compressor
Run
Compres s or s hutdown
C ompr essor
automati c
r ecover y
N or mal star tup
Compres s or run
Power failure
Starts up 3 min after power rec ov
Within 50 ms ec
Compres sor shutdown
After power rec ov ery :
Starts 3 min later
Power failure
(20 to 50 ms ec )
Power supply
condition
Power on
Power failure (50 msec or more)
Power on (power rec overy)
Run
Run
Stoppage s tatus
Normal s tartup
Pump
Run
Built-in pump s hutdown
Normal s tartup
Compressor
Run
Compres s or shutdown
Normal
s tartup
Compress or run
Power failure
Manual res tart pos s ible 3 min after power failure
Manual
res tart