Protective Function - Hitachi RPI-0.8FSG1 Service Manual

MAIN PARTS

3.1.5 Protective Function

(1) Excessive High or Low Voltage for Inverter
(a) Level of Detection
When the voltage of direct current is greater than (A) V, abnormalities are detected.
1
When the voltage of direct current is smaller than (B) V, abnormalities are detected.
2
(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 source 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
1 When the current detected by current sensor reaches 150% of the rated current, overcurrent is
detected. (Instantaneous Overcurrent)
When the current detected by current sensor exceeds 105% of the rated current continuously for
2
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.
(4) Protection of Transistor Module and ISPM
(a) Level of Detection
When some of the output terminals between "U" and "V", "V" and "W", "W" and "U" of transistor
1
module or ISPM are short-circuited, an abnormality is detected.
When the running current of transistor module or ISPM reaches (Maximum Rated Current x
2
105%), an abnormality is detected.
3
When an internal temperature is measured by internal thermistor of transistor module or ISPM, an
abnormality is detected.
4 When the control voltage of transistor module or ISPM 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 canceled when a stopping order is issued or
main power source is cut off.
3-10
380 - 415V, 50Hz
Power Supply
380V, 60Hz
(A)
(B)
220V, 60Hz
750 440
350 194