Troubleshooting - Yoshitake MD-53 Product Manual

5.5 Troubleshooting

Trouble
Ball (and motor) 1. Fluid pressure exceeds
does not rotate.
2. Ball is stuck with foreign
3. Limit switch
4. Power voltage is
5. Wiring is wrong
6. Disconnection inside
7. Loose connection of
8. Thermal protector has
9. Thermal protector
Ball (and motor) 1. Limit switch malfunctions.
does not stop
rotating.
2. Cam has loosened and
3. Wiring is wrong.
Other troubles 1. While the
2. Ball does not rotate while
Cause
the specified working
pressure.
substances.
malfunctions.
improper.
actuator.
wiring.
crack.
malfunctions.
does not rotate.
opening- closing
indicator lamp
shows
normal condition, ball does
not stop at either fully
opened or fully closed
position.
motor runs, because the
motor's movement is not
conveyed to connector
through output shaft.
How to check
1. Check the fluid pressure
with a pressure gauge.
2. Check the movement while
rotating actuator by hand.
3. While rotating actuator by
hand, check the continuity
between lead wires at the
time of valve's
opening/closing by using
ohmmeter.
4. Check power voltage by
using voltmeter.
6. While rotating actuator by
hand, check the continuity
between lead wires at the
time of valve's
opening/closing by using
ohmmeter.
7. Check terminal
connections for loose
screws.
8. Check thermal protector for
crack, after dismounting
actuator cover.
9. Thermal protector actuates
when the ambient
temperature exceeds 55 °C
or when motor generates
heat more than rated due
to overcurrent.
1. While rotating actuator by
hand, check the continuity
between lead wires at the
time of valve's
opening/closing by using
ohmmeter.
11
Remedy
1. Adjust the fluid pressure
to the appropriate level.
2. Please contact us.
3. Replace the actuator
with new one.
4. Adjust the power
voltage to the
appropriate level.
5. Correct the wiring.
6. Replace the actuator
with new one.
7. Fasten the screws
firmly.
8. Replace the actuator
with new one.
9. Cool down the thermal
protector and eliminate
the cause of
overcurrent.
Then, the thermal
protector recovers and
operates normally.
1. Replace the actuator
with new one.
2. Replace the actuator
with new one.
3. Correct the wiring.
1. Replace the actuator
with new one.
2. Replace the actuator
with new one.
■EPDT-191a■