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9-11
Chapter 9.
MAINTENANCE
& TROUBLESHOOTING
9 - 4
Motor Adjustment is Impossible
There are two ways of wiring a motor to the DCP32: wiring for direct motor rotation and wiring for reverse motor
rotation. When wired for direct motor rotation, the motor rotates in the clockwise (CW,
) direction as DCP32
output increases. There are two ways of making the motor rotate in the reverse direction (counterclockwise: CCW)
depending on your control requirements (e.g. cooling control):
• By switching the control operating direction on the DCP32 with the motor wired to the DCP32 for direct motor
rotation as it is, or
• By wiring the motor to the DCP32 for reverse motor rotation.
The control operating direction (direct/reverse) can be switched on the DCP32. If the motor is wired to the DCP32
for direct motor rotation, the DCP32 can be easily set up for control in either direction. This makes it easier to rem-
edy trouble that may occur during controller operation. For this reason, we recommend wiring the motor to the
DCP32 for direct motor operation.
15
14
13
11
12
16
DCP32
Wiring for direct motor rotation
Wiring for reverse motor rotation
3
24 Vac
2
1
Y
T
G
Motor
15
14
13
11
12
16
DCP32
3
24 Vac
T
CW
open
CCW
closed
CW
open
CCW
closed
CW
open
CCW
closed
CW
open
CCW
closed
2
1
G
Y
Motor
CW
: Clock Wise (
)
CCW : Counter Clock Wise (
)
The DCP32 is also provided with a function (
AL10
to
AL12
) for detecting MFB disconnection or short-circuit if
the motor has been wired to the DCP32 in the wrong way.
By this function, the DCP32 judges reverse direction wiring in the same way as direct direction wiring, and does
not generate an alarm. If the setting of variable parameter
m-C
is left at the factory setting (“0”), motor operation
is continued even if MFB disconnection occurs.
The following tables summarize the phenomena that occur according to how the motor and DCP32 are wired when
the motor is automatically adjusted (variable parameter
m-At
setting 1 is input). Motor rotation is started from the
fully closed position (motor is turned as far as possible CCW).
The values displayed in the lower display in the tables are only examples. Alarms are displayed after the motor
fully closes or fully opens.