MSP4 / MSP5 / MSP6
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-4854 Rev.15 P. 8 / 8
TROUBLESHOOTING
TROUBLE
POWER
LED
INPUT
LED
STATUS
LED
POSSIBLE CAUSE
HOW TO PROCEED
Actuator
does not
work
ON
ON
Blink
2 sec.
intervals
Abnormal input signal.
(No change over deadband)
Check input signal.
Narrow the deadband.
ON
---- *
Blink
0.5 sec.
intervals
Actuator mechanism is damaged.
Repair the unit.
Overload caused by a foreign object caught
in the valve.
Check the valve.
Control PCB damaged.
Repair or replace the PCB.
Wiring error at the motor or position sensor. Check the connector.
Low power voltage or insufficient power
supply.
Check the power supply.
ON
OFF
Blink
2 sec.
intervals
Abnormal input signal.
Check the input signal.
Wiring error at the input signal.
Check the connector and connecting section.
OFF
---- *
---- *
Wiring error at the power supply.
Check the connector and connecting section.
Abnormal power voltage.
Check the power supply.
Fuse melted.
Replace the fuse.
ON
---- *
ON
Malfunction by noise.
Turn off the power supply and restart.
Low power voltage or insufficient power
supply.
Check the power supply.
ON
---- *
OFF
Malfunction by noise.
Turn off the power supply and restart.
Low power voltage or insufficient power
supply.
Check the power supply.
Unstable operation
Power voltage is low or fluctuating.
Check the power supply.
Unstable input signal.
Check the controller, cables. Eliminate
noise.
Position sensor (potentiometer) damaged.
Replace the potentiometer.
Stem stops in the middle of stroke
or
Stem slows down in the middle of
stroke
Actuator mechanism is damaged.
Repair the unit.
Overload caused by a foreign object caught
in the valve.
Check the valve.
* The input LED status does not matter.
For repair or parts replacement, consult M-System or representatives.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protec-
tors for protection against induced lightning surges.
Please consult M-System for appropriate models.
