General Descriptions Of Injection Lev Operation - Mitsubishi Electric CAHV-P500YA-HPB Service Handbook

[ IX Troubleshooting ]

2. General descriptions of injection LEV operation

The valve opening changes according to the number of pulses.
1) Control board and LEV
LEV
4
M
6
2
5
1
2) Pulse signal output and valve operation
Output
(phase)
number 1 2
1
ON OFF
2
ON ON
3
OFF OFF
4 OFF OFF
3) LEV valve closing and opening operatio
Valve closed
Valve open
A
HWE10060
ø6
ø5
ø4
ø3
ø2
ø1
Output state
3 4 5 6 7
OFF OFF OFF OFF ON
ON OFF OFF OFF OFF
ON ON ON OFF OFF
OFF OFF ON ON ON
B
Fully open
480 pulses
Pulses
Red
Brown
Blue
Orange
Yellow
White
Connector CNLVE
Output pulses change in the following orders when the
Valve is open;
8
Valve is closed;
ON
*1. When the LEV opening angle does not change,
OFF
all the output phases will be off.
OFF
*2. When the output is open phase or remains ON,
OFF
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 "
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.
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Outdoor control board
DC12V
6
5
Drive circuit
ø4
4
ø3
3
ø2
2
ø1
1
1 2 3 4 5 6
8 7 6 5 4 3
" in the diagram. (Pulse signal is output
A
7 8 1
2 1 8
GB