Daikin VRV IV+ Service Manual page 225

To perform an insulation check of the compressor
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
a
a Faston connector
7 Install the compressor insulation.
8 Turn ON the power using the respective circuit breaker.
9 Start the unit operation via the central controller.
10 Once the compressor operates, measure the U-V-W inverter voltages. All
measurements MUST be the same.
Inverter voltage measurements are
correct?
Yes
No
11 Measure the current in each phase U-V, V-W and U-W. All measurements
MUST be the same.
Compressor motor winding current
measurements are correct?
Yes
No
Prerequisite: First perform an electrical check of the compressor, see
"3.3.1 Checking procedures" [
Prerequisite: Stop the unit operation via the central controller.
1 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see
rectifier voltage" [
2 Remove the cover of the compressor wire terminals.
a
a
Action
Continue with the next step.
Replace the inverter PCB, see
"3.10 Inverter
Action
Perform an insulation check of the
compressor, see
procedures" [
Preventively replace the compressor,
see "3.3.2 Repair
4
221].
4
356].
3 Components
|
4
PCB" [ 274].
"3.3.1 Checking
4
221].
4
procedures" [ 227].
"To check the
Service manual
225