Electrical System - Fujitsu Waterstage Comfort 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 relaySteps to be followed before
performing any work on the Inverter module:
Inspection of the IPM (mounted on transistor PCB) (Only for WOYA080LFCA and Inspection of the IPM (mounted on transistor PCB) (Only for WO*A080LFCA and
WOYA100LFTA models) WO*A100LFTA models)
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 ∞)
• 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
WOYA080LFCA
WO*A080LFCA
WOYA100LFTA
WO*A100LFTA
Maintenance document "1792 - EN"