Mitsubishi Electric CAHV-P500YB-HPB, Service Handbook

Page: 141 / 169

[
IX
Troubleshooting ]
- 134 -
HWE15070 GB
2. General descriptions of injection LEV operation
The valve opening changes according to the number of pulses.
1) Control board and LEV
2) Pulse signal output and valve operation
3) LEV valve closing and opening operatio
Connector CNLVE
Outdoor control board
Drive circuit
DC12V
ø4
ø3
ø2
ø1
6
5
4
3
2
1
Red
Brown
Blue
Orange
Yellow
White
ø4
ø3
ø6
ø5
ø2
ø1
LEV
M
5
2
1 3
4
6
Output state
Output
(phase)
number
1
ON
ON
OFF
OFF
2
OFF
ON
OFF
OFF
3
OFF
ON
ON
OFF
4
OFF
OFF
ON
OFF
5
OFF
OFF
ON
ON
6
OFF
OFF
OFF
ON
7
ON
OFF
OFF
ON
8
ON
OFF
OFF
OFF
1
2
3
4
Output pulses change in the following orders when the
Valve is open; 1 2 3 4 5 6 7 8 1
Valve is closed; 8 7 6 5 4 3 2 1 8
*1. When the LEV opening angle does not change,
all the output phases will be off.
*2. When the output is open phase or remains ON,
the motor cannot run smoothly, and rattles and vibrates.
*Upon power on, a 520 pulse signal is sent to the LEV to determine the valve position
and bring the valve to the position indicated by " " in the diagram. (Pulse signal is output
for approximately 17 seconds.)
The LEV is free of noise and vibration when it is functioning properly, but it makes a noise
when it becomes locked.
*Whether a sound is generated or not can be determined by
holding a screwdriver against it, then placing your ear against the handle.
*If liquid refrigerant is present in the LEV, it may make the operating sound of the LEV
difficult to detect.
480 pulses
A
V
alve opening (refrigerant flow rate)
Valve closed
Valve open
Pulses
Fully open
B
A
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