OSEEX206-EN
Document is subject to change without notice.
NIPPON VALVE CONTROLS, INC.
1-21-19 Meieki minami, Nakamura-ku, Nagoya 450-0003 JAPAN
TEL: 81-52-582-6435 FAX: 81-52-582-6439
10/10
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
TROUBLE SHOOTING
Problem Cause Solution
Actuator
does not
move.
Faulty wiring. Correct the wiring.
No voltage is
coming.
Check the voltage.
Incorrect
voltage.
When it's burned out by
excess voltage, replace
the actuator.
Short the
circuit, contact
failure.
Review wires and
connection.
Motor is too
old.
Replace the actuator.
Repair in our factory.
Capacitor is
too old.
Replace the capacitor.
Operation is
unstable.
Excess surge
or voltage was
applied.
• Replace the control
board or limit switch.
(Repair in our factory)
• Replace the actuator.
Rainwater
entered the
actuator.
• Dry the inside.
• Replace the actuator.
Added high
harmonics
noise from an
inverter.
Attachment a filter for
each inverter maker
option.
Effect of high
level noise.
Use the shielded wire
and ground the wiring.
Separate signal wire
from power line.
Switch leakage
current is
large.
Current leakage should
be less than 1 mA.
Stop in the
mid position.
• Biting of
valve seat.
• The scale
has adhered
to the valve
ball.
Manually operate an
actuator and remove a
foreign object.
Clean or replace valve
parts.
(MS MH)
Overload
protector runs
because of
over-torque.
Motor protection circuit
returns by the signal of
operation of an
opposite direction.
Turn on the power
again.
Received
the alarm
signal.
Problem Cause Solution
Leakage
from
valve body
• Valve cap
get loose.
• Valve body is
damaged.
Replace the valve.
Leakage
from
valve seat
Seat is worn
or damaged.
Replace the valve.
Replace the seat.
(MS MH)
Leakage
from
valve stem
Stem packing
is worn or
distorted.
Replace the valve.
Replace the packing.
(MS)
Replace the o-ring.
(MH)
For more information contact
NIPPON VALVE CONTROLS, INC. for consultation.
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