Electrical System - Fujitsu Waterstage WS G140DC6 Series Maintenance Document

Split system (Single phase and 3-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 Power Transistor Module (Main board)
Disconnect the compressor relay and the condenser
connection. Measure the resistance value at the
points shown on the illustration, and then compare
the values observed with those in the table.
Multimeter
42
Terminal block
Resistor
1 MOhm
or more
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.
3-phase type Single phase type
N
W
V
Main PCB
U
P
Maintenance Document 1544-1