Mitsubishi PUZ-A18NHA6 - Linear Expansion Valve Testing

64
<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
Valve position (capacity)
A
B
C
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phases
becomeOFF.
 •Whenthepower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thannormalsituation.
NosoundisheardwhenthepulsenumbermovesfromBtoA i n 
casecoilisburnoutormotorislockedbyopen-phase.
 •Soundcanbedetectedbyplacingtheearagainstthescrewdriv-
er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
12 V DC
Outdoor 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opens/closesthroughsteppingmotorafterreceivingthepulsesignalfromtheoutdoorcontrollerboard.
•Valvepositioncanbechangedinproportiontothenumberofpulsesignal.
<Connectionbetweentheoutdoor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
(A12,18)
OCH577A