Mitsubishi Electric PAC-LV11M-J Installationshandbuch PDF herunterladen (Seite 25)

2) LEV operation

When the power is turned on, a pulse signal of 2200 pulses is output (valve closure signal), to bring the valve to position A.

When the valve is operating normally, it is free of vibration noise. If the valve locks or when it goes from point E to A in the figure,

it makes louder noise than would be heard when there is an open phase.

Check for abnormal sound/vibration by placing the metal tip of a screwdriver against the valve and the handle side against your

ear.

3) Troubleshooting

(a) Close

(b) Open

(d) No. of pulses

(e) Extra tightening (80 - 100 pulse)

(f) Valve opening degree

Symptom Checking Criteria Remedy

Circuit failure on

the microcomputer

Disconnect the connectors on the control board, and connect LEDs to test the cir-

cuit as shown below.

Pulse signals are output for 10 seconds when the main power is turned on. If there

are LEDs that do not light up at all or remain lit after the pulses are turned off, there

is a problem with the driving circuit.

Replace the con-

troller board if

driving circuit fail-

ure is detected.

Locked LEV The motor will idle and make small clicking noise if it is run while the LEV is locked.

If this clicking noise is heard both when the valve is fully closed and while it is being

opened, it indicates a problem.

Replace the LEV.

Disconnected or

shorted LEV motor

coils

Measure the resistance between the coils with a tester (red-white, red-orange,

brown-yellow, brown-blue). The normal range of resistance is 150 Ω±10%

Replace the LEV.

(f)

(a)

(b)

(e)

(d)

(c)

1 k

LED

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