Electrical System - Fujitsu WATERSTAGE WS A050DD6 Series Maintenance Document

Split system single phase type

3.1.2 Electrical System

Outdoor Unit Overvoltage
Check for possible causes in the list below (this list is
not exhaustive):
•
Problem with the compressor
•
Main board
•
Faulty power relay
Inspection of the IPM (mounted on transistor PCB) (Only for WO*A080LDC and
WO*A100LDT models)
Disconnect the connection wires between the
transistor PCB-Capacitor PCB and Transistor PCB-
Inverter compressor.
Set the tester to resistance mode, and measure the
resistance between the following terminals :
TM301 (P) – TM305 (U) / TM304 (V) / TM303 (W)
TM302 (N) – TM305(U) / TM304 (V) / TM303 (W)
Judge the results as follows :
Terminal
Tester (+) Tester (-)
P U
P V
P W
U P
V P
W P
N U
N V
N W
U N
V N
W N
40
Resistance value
Over 2kΩ
(Including ∞)
Over 20kΩ
(Including ∞)
Over 2kΩ
(Including ∞)
Steps to be followed before performing any work
on the Inverter module:
•
First switch off the system using the circuit
breaker at the head of the line.
•
Remove the unit cover and then remove the
Inverter module cover.
•
Measure the voltage at the condenser terminals.
You should find a value of 5 Vdc or less.
WO*A080LDC
WO*A100LDT
Maintenance Document 1589-3