Mitsubishi Electric CITY MULTI CMB-P1010V-E, Руководство по обслуживанию, Страница: 82 / 154

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LEV for BC controller and indoor unit
1 LEV receives pulse signal from microcomputer, and operates valve with stepping motor.
2
Valve opening changes in proportion to the number of pulses.
Connection of microcomputer circuit board and LEV
Connector
In the case of indoor board : CN60
In the case of multi board :
CNLV
Note:
Pay attention to colors of lead wires
because numbers of intermediate connec-
tors are different from those of circuit board
side connectors.
Pulse signal output and valve operations
Output (phase)
No.
Output states
1 2 3 4
ø 1
ø 2
ø
3
ø 4
ON OFF OFF ON
ON ON OFF OFF
OFF ON ON OFF
OFF OFF ON ON
1 Valve open : Output pulse changes in order of 1
→
2
→
3
→
4
→
1.
Valve close : Output pulse changes in order of 4
→
3
→
2
→
1
→
4.
2 All output phases are turned OFF when LEV opening does not
change.
3 In case output phase is lacking or kept “ON,” motor can not rotate
smoothly, generating ticking sound and vibration.
Closing and opening operations of valve
B
E
A
C
D
Valve opening (Flow rate)
V
alv
e
clo
sin
g V
al
ve
o
pe
nin
g
Full opening
(2000 pulses)
Number of
pulse(SJ)
Additional tightening zone
(870 ~ 100 pulses)
1 When turning on power source, issue valve closing signal of 2,200
pulses, so that valve opening is located at point
A
.
2 When valve runs smoothly, no sound or vibration is generated from
LEV. However, big sound is observed when valve opening changes
from point
E
to
A
or valve is locked.
(Sound generation can be identified from the bundle of screwdriver
attached to the valve.)
Intermediate connector
(mounted on outdoor unit only)
Brown
Red
Blue
Orange
Yellow
White
Microcomputer circuit boad
Operarion
circuit