PSN1 / PSN3
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-4857 Rev.10 P. 8 / 9
PROTECTIVE FUNCTIONS
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ERROR DETECTION
• When the position signal is deviated from the input sig-
nal but the output stem is stuck due to overload or certain
malfunction, the PSN repeats starting the motor at the
maximum torque for several items. 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 ob-
stacles in the valve, inappropriate adjustments, or re-
tightened gland packing or other possible causes of the
overload.
• e sure to remove the cause of alarm in order to ensure
appropriate life span.
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ABNORMAL TEMPERATURE INCREASE PROTECTION
• When the incorporated temperature sensor detects an ab-
normal temperature increase in the motor, the PSN out-
puts an alarm signal (LED blinks in 0.5-sec. ON – 0.5-sec.
OFF sequence) and stops power supply to the motor until
the temperature decreases to an acceptable level.
• The PSN is designed to automatically recover power sup-
ply to the motor. It take longer to recover normal opera-
tion when ambient temperature is higher.
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PROTECTIVE FUSE
• A fuse is incorporated for protection against overcurrent
in the control PCB and motor.
• If the power LED does not turn on with the power sup-
plied 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 M-Sys-
tem or M-System’s representative.
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MOTOR PREHEAT FUNCTION
When the PSN detects a temperature lower than 0°C or
32°F (approximate) on the surface of its motor, the PSN sup-
plies current to the motor in order to warm up and maintain
its surface temperature at 5°C or 41°F (approximate).
Maintain the power supply ON when the PSN is used in the
ambient temperature below 0°C or 32°F.
MAINTENANCE
For effective use and longer life of the PSN, regular checking appropriate for its operating conditions are recommended. Refer
to the following table.
ITEM
CHECKING POINT
HOW TO PROCEED
Functioning
Apply input 0%, 50%, 100%, then back to 50%, 0%.
Check the actuator operations and positions at each
input value.
Repair or calibration
If the alarm indicator LED is on, check that the
valve operates lightly and smoothly.
Abnormal sound
No abnormal sound is heard during operation.
Repair or calibration
Connector
Leadwire
The connector is firmly connected.
No breakdown of leadwires.
The insulation covers are not torn, not bruised.
Repair or calibration
Inside humidity, rust
No condensation. No rust.
If there is water inside, check the packing.
Remove water, dry the case and inside parts.
Replace rusted parts. Calibration.
If the packing is damaged, replace it.
Screws
Check that screws and bolts are securely fastened.
Re-tighten them.
Nut
Check that the nut at the valve stem is not loose.
Re-tighten it and calibrate.
For repair or parts replacement, contact M-System or representatives.
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LUBRICATION
There is no need of oiling the PSN in normal operating conditions.
■
REGULAR TEST RUNNING
If the valve is not frequently operated, run a test operation regularly (once a week, for example) to check proper functions.
