(b) Resistance is measured when the - side of the multimeter
touches the + side of the diode module and the + side of the
multimeter touches the ~ terminals (3 Nos.) of the diode module. It
is normal for all the resistances to be greater than 500 kΩ.
(c) Resistance is measured when the - side of the multimeter
touches the - side of the diode module and the + side of the
multimeter touches the ~ terminals (3 Nos.) of the diode module. It
is normal for all the resistances to be between 5 and 50 kΩ.
(d) Resistance is measured when the + side of the multimeter
touches the - side of the diode module and the - side of the
multimeter touches the ~ terminals (3 Nos.) of the diode module. It
is normal for all the resistances to be greater than 500 kΩ.
(4) Method for checking the capacitor
(a) Check that the screws are tightly fastened.
(b) Check that the capacitor is not blackened or bulging out.
When checking the capacitor, disconnect the -B- terminals.
Do not disconnect the -A- terminals.
Capacitance
400 V
For Inverter
4700 µF
For the fan controller
2700 µF
(5) Method for checking the resistor
Measure both ends of the resistor as shown in the figure. It is
normal for the resistance to be ∞ Ω.
Resistance
400 V
For Inverter
RS1
0.5 kΩ
RS2
0.5 kΩ
R1
6.3 kΩ
R2
10.5 kΩ
(6) Method for checking the fan controller
(a) Turn OFF the power source switches before performing this work.
Also ensure that LED501 (red) on the fan controller is turned OFF.
If LED501 is ON, electrical shock may occur.
(b) Disconnect all the cables connected to the fan controller.
Measure the resistance between terminals using a multimeter. Do not use a digital multimeter.
Screw
8 Troubleshooting
269
SMGB0065 rev. 1 - 12/2010
8
