Control For Recovery From Power Interruption (Option) - Hitachi SAMURAI Series Service Manual

2 Control Functions
Control functions on the module

2.1.4 Control for recovery from power interruption (Option)

When this function is enabled, even in the case of power interruptions exceeding 2 seconds in length, operation restarts
automatically in the operation mode as before the power failure, once a 3-minute guard has passed.
To enable this function, the DIP switch of option C on the settings PCB (PCB

Setting PCB (PCBA)
Momentary power failure where rated
voltage drops by more than 20% with
a duration between 12ms and 2s
Power source
status
OFF
Pump operation
order
OFF
Chiller unit
operation status
OFF
Compressor
ON
operation status
OFF
?
N O T E
• When this function is enabled, recovery upon restoration of the power supply returns to the state before the power interruption. In case
that the chiller unit was in operation before the power interruption, it restarts upon recovery of the power source. Depending on the
situation, this may lead to unintentional automatic startup of the chiller unit.
• The control for recovery from power interruption restarts in the same state as before the occurrence of the power interruption.
Therefore, in case that the power interruption occurs while the unit is stopped, it remains stopped even upon recovery of the power
source.
15 SMGB0120 rev.0 - 11/2017
DSW5
ON
ON
ON
ON
ON
min
Time guard
) (DSW5-1#) has to be set to ON.
A
Option C
1 2 3 4
When the function for recovery
from power failure is selected
(In case that this function is
not selected, it is necessary to
Power failure exceeding
2 seconds
min
Selected from DIP
Time guard
switches
restart operation)
2