Installation, Operation and Maintenance Manual
Control Valves Electric Actuated Type M 4
6) Installation Places
󲱕 Indoors or outdoor that has no direct sunlight, with the atmosphere temperature of -5 - +55.
󲱕 The place where the humidity is 90%RH or less and the dew won’t be congealed.
Nominal Size: 50, 80, 100mm
1) Error Detection
When the position signal is deviated from the input signal but the output stem is stuck due to overload or certain
malfunction, the PSN repeats starting the motor at the maximum torque for several times. If the stem is still stuck
after that, the PSN outputs an alarm signal (LED turned ON) and stops power supply to the motor.
In order to reset the PSN, apply several times 0% and 100% input signals in turn, or turn off and on the power supply.
In case the alarm is off frequently, check for foreign obstacles in the valve, inappropriate adjustments, or re-tightened
gland packing or other possible causes of the overload.
2) Electric Limiter
An electric limiter is in the valve, which protect rocking when the input signal becomes 4mA or less, or 20mA or
more. Thus, the valve stops closing at the point, 3.8mA even when the input signal is decreased to 3.8mA or less
and stops opening at the point, 20.2mA even when the input signal is increased to 20.2mA or more.
3) Timer Function
This unit is equipped with a timer protecting from the motor from overheating. The timer prevents the motor from
restarting for a certain interval once the motor has been stopped within dead band.
When the high temperature protection is activated in a high temperature ambient, adjust the timer to a long interval.
4) Protective Fuse
A fuse is incorporated for protection against over current in the control PCB and motor.
If the power LED does not turn on with the power supplied to the actuator, check the fuse status.
If a replaced fuse is blown quickly, it is possible that the control PCB and/or motor are damaged. Consult near
Asahi dealer.
5) Installation Places
󲱕 Indoors or outdoor that has no direct sunlight, with the atmosphere temperature of -5 - +55.
󲱕 The place where the humidity is 90%RH or less and the dew won’t be congealed.
6) Wiring
Do not install signal wires and power supply wires together in a pipe because it may cause a malfunction due to
inductive noises. If they must be installed together, use shielded cables.
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