mundoclima Aerotherm V17 Series, Руководство по обслуживанию

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L1/L2 troubleshooting 4.19.7
The normal DC voltage between terminals P and N on inverter module is 310V in standby and 380V when the fan motor is
running. If the voltage is lower or higher than the normal voltage, the unit displays an L1 or L2 error.
Figure 4-4.2: Inverter module terminals
Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on
L1 / L2
Power supply is abnormal
Yes
Re-start the unit once the power supply
has returned to normal
No
Bridge rectifier is damaged
1
Yes
Replace the bridge rectifier
No
Replace the inverter module
2
Notes:
1. Check the bridge rectifier using one of the following two methods (refer to Figure 4-4.3):
ƒ
Method 1: measure the resistance between any two of the 5 bridge rectifier terminals. If any of the resistances is close to zero, the bridge rectifier
has failed.
ƒ
Method 2: dial a multimeter to the diode setting:
- Put the red probe on the DC power output negative terminal (terminal 5) and put the black probe onto each of the AC power input terminals
(terminals 1, 2 and 3) in turn. The voltage between terminal 5 and each of terminals 1, 2 and 3 should be around 0.378V. If the voltage is 0, the
bridge rectifier has failed.
- Put the red probe on the DC power output positive terminal (terminal 4), then put black probe onto each of the AC power input terminals
(terminals 1, 2 and 3) in turn. The voltage between terminal 4 and each of terminals 1, 2 and 3 should be infinite. If the voltage is 0, the bridge
rectifier has failed.
2. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the PFC and IPM modules (on the reverse side of the
inverter module PCB). Refer to Figure 4-4.1.
N
P U V W
P
U
V
W
N
MUNDOCLIMA AEROTHERM V17 - BIBLOC