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. 7 / 8
B) Sensitivity (Deadband)
There may be a case where the motor operates in re-
sponse to an input signal change but does not stop and
oscillates by frequently changing the rotation direction.
Widen the deadband by turning DZ adjuster clockwise in
such a case.
The deadband is factory-set to 1.5 %.
C) Limit Switches
(for optional full-open and full-closed signals) *
Loosen the screws and adjust positions of the dogs.
Each dog cannot be set at an intermediate position.
Be sure to set the dog at the fully-open or closed-position.
See Figure 9.
Note: Not available when the long-life potentiometer option
(/P) is selected.
Limit Switches
Dog (full-opened position)
Screws
Dog (full-closed position)
Potentiometer
Figure 10. Limit Switches
MAINTENANCE
For effective use and longer life of the MSP, regular checking appropriate for its operating conditions are recommended.
Refer to the following table.
■
INSPECTION
ITEM
CHECKING POINT
HOW TO PROCEED
Stem operation
Apply input 0%, 50%, 100%, then back to 50%, 0%.
Check that the actuator operates and positions cor-
rectly at each input value.
Repair or calibrate the unit.
Abnormal sound
Check if abnormal sound is heard during operation.
Repair the unit.
Connector
Leadwire
Ensure that the connector is firmly connected.
Check for breakage of leadwires.
Ensure that the insulation coating is not broken or
damaged.
Repair or replace the connector/leadwires.
Water or rust inside
the housing
Check that there is no water or rust inside the hous-
ing.
Check that the gasket is not damaged.
Check that the cable connector is not loose.
Remove water, dry the housing and the parts inside.
Replace rusted parts, if any.
Replace the gasket, if damaged.
Re-tighten the cable connector.
Screws
Check that screws and bolts are securely fastened.
Re-tighten them, if loose.
Lock nut
Check that the Lock nut is not loose.
Re-tighten the Lock nut if loose and calibrate the
unit.
For repair or parts replacement, contact M-System or representatives.
■
LUBRICATION
There is no need of oiling the MSP 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 ensure that the actuator
operates properly.
