Daikin VRV IV+ Service Manual page 277

To perform a diode module and power module check
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
a Connector X3A
b Power terminal assembly
For double fan units
3 Measure the voltage on the rectifier voltage check connector (a) X5A to check
inverter PCB A3P (c).
Result: The measured voltage should be approximately 560 V DC.
4 Measure the voltage on the rectifier voltage check connector (b) X6A to check
inverter PCB A6P (d).
Result: The measured voltage should be approximately 560 V DC.
b
a Connector X5A
b Connector X6A
c Inverter PCB A3P
d Inverter PCB A6P
Is the measured voltage correct?
Yes
No
Prerequisite: First check the rectifier voltage of the inverter PCB, see
"3.10.1 Checking procedures" [
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
a
b
d
a
Action
Diode module and power module are
OK. Perform a power transistor check of
the inverter PCB, see
procedures" [
Perform a diode module and power
module check, see
procedures" [
4
274].
3 Components
|
c
"3.10.1 Checking
4
274].
"3.10.1 Checking
4
274].
Service manual
277