Mitsubishi Electric VL-250CZPVU-L-ERT Handbook page 46

Components
DC motor 1. Remove the motor cover, and measure resistance at the following points to check for coil
breakage:
(Measure the resistance with the motor connectors (CN9, CN10) disconnected from the
power circuit board.)
<VL-250 type>
• Between V and U...102.8 Ω
• Between V and W...102.8 Ω
• Between W and U...102.8 Ω
<VL-350 type, VL-500 type>
• Between V and U...27.8 Ω
• Between V and W...27.8 Ω
• Between W and U...27.8 Ω
* Resistance in a 30 °C atmosphere
2. Other check points
• Are any parts discolored to black?
• Is any liquid adhered to any parts?
• Is the circuit board broken?
• Is the solder cracked?
[4] Diagnosis of the thermistor
Remove the thermistor connector (RA thermistor: CN15, OA thermistor: CN22) from the control circuit
board, and measure resistance to detect a failure.
Resistance (reference)
Open (100 kΩ or higher)
Shorted (1.0 kΩ or lower)
3.0 kΩ
4.2 kΩ
6.0 kΩ
8.8 kΩ
20.6 kΩ
32.8 kΩ
53.9 kΩ
Reference temperature
for failure detection
It is abnormal.
It is abnormal.
30°C
20°C
10°C
0°C
-10°C
-20°C
-30°C
─ 46 ─
Checklist
U
<Circuit board in the DC motor for VL-250 type>
V
<Circuit board in the DC motor for
VL-350 type and VL-500 type>
V W
U W