Mitsubishi Electric PAC-AK31BC, Техническое и сервисное руководство

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<Output pulse signal and the valve operation>
(2) Linear expansion valve operation
Open
Extra tightening (about 32 pulse)
Pulse number
500 pulse
Opening a valve
all the way
Close
V
alve position (capacity)
Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
The output pulse shifts in above order.
• When linear expansion valve operation stops, all output phase
become OFF.
• When the switch is turned on, 700 pulse closing valve signal will be
sent till it goes to
A
point in order to define the valve position.
(The pulse signal is being sent for about 20 seconds.)
• When the valve moves smoothly, there is no sound or vibration
occurring from the linear expansion valve : however, when the pulse
number moves from
B
to
A
or when the valve is locked, sound can
be heard.
No sound is heard when the pulse number moves from
B
to
A
in
case coil is burnt out or motor is locked by open-phase.
• Sound can be detected by placing the ear against the screw driver
handle while putting the screw driver to the linear expansion valve.
LEV
M
1
6
:
4
:
4
:
3
:
2
:
1
2
1 Red
Brown
Blue
Orange
Yellow
White
3
4
5
6
Connector LEV-A
LEV-B
LEV-C
LEV-D
LEV-E
DC12V
branch box controller board
Drive circuit
:
3
:
2
:
1
3
2
5
4
Linear expansion valve
(1) Operation summary of the linear expansion valve
• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the branch box controller
board.
• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the branch box controller board and the linear expansion valve>
1
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
:
1
Output
(Phase)
Output
:
2
:
3
:
4
2 3 4
5 6 7 8
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
ON
(LEV) in Branch box