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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]
Power supply
Power on
condition
Run
Run
Pump
Run
Compressor
Run
Power failur e
[Less than 50 msec → For power failure of duration between 20 msec and 50 msec, operation is
temporarily stopped, but is automatically restored]
Power supply
Power on
condition
Run
Run
Pump
Run
Compressor
Run
Power failur e
[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)]
Power supply
Power on
condition
Run
Run
Pump
Run
Compressor
Run
Power failur e
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 failure
Power on ( power r ec ov er y )
(20 msec)
O per ating c ondition c ontinues
Built- in pump c ontinues oper ation
Compr es s or oper ation c ontinuous oper ation
20 ms ec
Power failur e
Power on ( power r ec ov er y )
( 20 to 50 ms ec )
Stoppage s tatus
O per ating c ondition c ontinues
Built- in pump s hutdown
Shut dow n for
appr ox . 5 s ec
Compr es s or s hutdow n
Compr es s or s hutdown
After power r ec ov er y :
Star ts 3 min later
Within 50 ms ec
Star ts up 3 min after power r ec ov
Power failur e ( 50 ms ec or mor e)
Stoppage s tatus
Built- in pump s hutdown
Compr es s or s hutdown
Manual r es tar t pos s ible 3 min after power failur e
After power r ec ov er y : T he built- in pump s tar ts appr ox imately 5 s ec later
C ompr es s or
automat i c
r ec ov er y
N or mal s t ar tup
Power on ( power r ec ov er y )
Manual
r es tar t
- 57 -
Compr es s or r un
Nor mal s tar tup
Nor mal s tar tup
Nor mal
Compr es s or r un
s tar tup
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