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Mitsubishi Electric PURY-WP200 Service Manual page 221

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[ IX Troubleshooting ]
LEV
-5- LEV
LEV operation
HBC controller LEVI, 2, and 3 (linear expansion valves) are driven by the pulse signal from the control board and are controlled
by a stepping motor.
(1) HBC controller LEV
The valve opening changes according to the number of pulses.
1) Control boards and the LEV (HBC controller LEV1, 2, 3)
LEV
Blue
4
Red
6
M
Yellow
2
5
1
White
Orange
2) Pulse signal output and valve operation
Output
(phase)
number
1
1
ON
2
ON
3
OFF
4
OFF
3) LEV valve closing and opening operation
Valve closed
A
E
B
80 - 100 pulses
HWE1113B
ø4
ø3
ø2
ø1
Output state
2
3
OFF
OFF
ON
OFF
ON
ON
OFF
ON
D
C
Valve open
Fully open *1
. 3000 pulses (HBC controller LEV1, 2, 3)
Pulses
Brown
Blue
Orange
Yellow
White
Output pulses change in the following orders when the
Valve is closed; 1
4
Valve is open;
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,
ON
the motor cannot run smoothly, and rattles and vibrates.
* Upon power on, the HBC controller circuit board sends 3200 Hz pulse
signals to the LEVs (HBC controller LEV 1, 2, and 3) to determine the valve
position and bring the valve to the position as indicated by A in the diagram.
When the valve operates smoothly, no sound from LEV or no vibration
occurs, however, when the pulses change from E to A in the chart or
the valve is locked, a big sound occurs.
*Whether a sound is generated or not can be determined by
holding a screwdriver against it, then placing your ear against the handle.
*1 The LEV opening may become greater depending on the operation status.
- 212 -
Control board
DC12V
6
5
Drive circuit
ø4
4
ø3
3
ø2
2
ø1
1
2
3
4
1
4
3
2
1
4
GB
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