Table of Contents
Advertisement
11 Electrical checks of the
main parts
11.1.3 Protection function
1. Excessively high or low Inverter voltage
a. Level of detection at 400 V / 50 Hz:
•
Excessively low voltage in case the DC voltage is lower than 350 V.
•
Excessively high voltage in case the DC voltage is higher than 750 V.
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
2. Malfunction in the current sensor
a. Level of detection:
•
A malfunction is detected when the operating frequency is 15–18 Hz and the inverter compressor current decreases
below 1.5 A.
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
3. Inverter overcurrent protection
a. Level of detection:
•
Overcurrent is detected when the current sensor detects that the compressor current is higher than the transistor
module's (IPM) rated current. (Instantaneous Overcurrent).
•
When the current detected by current sensor exceeds 105 % of the rated current continuosly for 30 seconds or for
3 minutes in total during a 10 minutes period, overcurrent is detected. (Electric Thermal Relay).
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
4.Transistor module (IPM) protection
a. Level of detection:
•
An anomaly is detected when some of the output terminals between "U" and "V", "V" and "W", "W" and "U" of the
transistor module (IPM) are short-circuited.
•
A malfunction is detected when the transistor module (IPM) running current reaches the rated current limit.
•
A malfunction is detected when the transistor module (IPM) thermistor measures an abnormal increase in
temperature.
•
A malfunction is detected when the transistor module (IPM) control voltage detects an abnormal decrease.
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
5. Fin temperature increase
a. Level of detection:
•
An anomaly is detected when the thermistor's internal temperature increases above 90 °C.
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
6. Earth detection
a. Level of detection:
•
A malfunction is detected when the terminal U, V, W a compressor earth are short-circuited before the compressor
is turned on.
•
A malfunction is detected when the transistor module (IPM) output terminals (U, V, W) are short-circuited.
b. Function:
•
When a malfunction has been detected, the Inverter compressor stops and transmits the stop cause signal to PCB1.
c. Cancellation of the protection function:
•
The stop cause signal transmission is cancelled when remote control switch is off or main power source is cut off.
332
SMGB0065 rev. 1 - 12/2010
Advertisement
Table of Contents
Troubleshooting
