Hitachi RASC-10HNPE, Руководство по обслуживанию, Страница: 143 / 306

8 Electrical checks of the main parts
Inverter
SMGB0091 rev.2 - 11/2015 133
8
8.1.3 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 3N~ 400V 50Hz
(A) 750
(B) 350
b. Function . When abnormalities are detected, the inverter compressor is stopped and transmits 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 source is cut off.
2 Abnormality of current sensor
a. Level of detection . When current of the inverter compressor decreases lower than 1.5 A 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 transmits 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 .
Š
When the current detected by current sensor reaches 150% of the rated current, overcurrent is detected.
(Instantaneous overcurrent).
Š
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 transmits the signal code of
stoppage cause to PCB1.
c. Cancellation of protection function . Transmission for signal code of stoppage cause is cancelled by stopping
order is issued or main power source is cut off.
4
Protection of IPM/DIP-IPM
a. Level of detection .
Š
When some of the output terminals between “U” and “V”, “V” and “W”, “W” and “U” of IPM/dip IPM are short-
circuited, an abnormality is detected.
Š
When the running current of IPM/DIP-IPM reaches (maximum rated current x 105%), an abnormality is
detected.
Š
When an internal temperature is measured by internal thermistor of IPM, an abnormality is detected.
Š
When the control voltage of IPM/DIP-IPM decreases, an abnormality is detected.
b. Function
. When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage
cause is transmitted 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.
5 Fin temperature increase
a. Level of detection . When the temperature of internal thermistor exceeds more than 90ºC (for 4-6HP) or 100°C
(for 8/10HP), an abnormality is detected.
b. Function . When abnormalities are detected, the inverter compressor is stopped and the signal code of stoppage
cause is transmitted 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.