Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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9 Electrical checks of
the main parts
SMGB0070 rev. 1 - 08/2011
225
9
9.1.3 Protective function
1 Excessive high or low voltage for inverter
a. Level of detection
Š
When the voltage of direct current is greater than (A) V, abnormalities are detected.
Š
When the voltage of direct current is smaller than (B) V, abnormalities are detected.
Power supply 400V, 50Hz / 380-415V, 50Hz 230V, 50Hz
(A) 750 440
(B) 350 194
b. Function
When abnormalities are detected, the inverter compressor is stopped and transmit the signal code of stoppage
cause to PCB1.
c. Cancellation of protection function
Transmission for signal code of stoppage cause is cancelled when a stopping order is given or main power sour-
ce is cut off.
2 Abnormality of current sensor
a. Level of detection
When current of the inverter compressor decreases lower than 0.5A during the inverter compressor frequency
between 15Hz and 18Hz, an abnormality is detected.
b.
Function
When abnormalities are detected, the inverter compressor is stopped, and transmit the signal code of stoppage
cause to PCB1.
c. Cancellation of Protection Function
Transmission for signal code of stoppage cause is cancelled when a stopping order is issued or main power
source is cut off.
3 Overcurrent protection for inverter
a. Level of detection
When the current detected by current sensor reaches 150% of the rated current, overcurrent is detected. (Instan-
taneous overcurrent)
When the current detected by current sensor exceeds 105% of the rated current continuously for 30 seconds or
for 3.5 minutes in total during a 10 minutes period, overcurrent is detected. (Electric thermal relay)
b.
Function
When abnormalities are detected, the inverter compressor is stopped and transmit the signal code of stoppage
cause to PCB1.
c. Cancellation of protection function
Transmission for signal code of stoppage cause is canceled by stopping order is issued or main power source is
cut off.