OSCNS209-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
7/7
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
TROUBLE SHOOTING
Problem
Cause
Solution
Actuator
does not
move.
Faulty wiring.
Correct the wiring.
Voltage and
input signal are
not coming.
Check the voltage and
input signal.
Incorrect
voltage.
When it's burned out by
excess voltage, replace
the actuator.
Connection or
wiring is not
correct.
Correct the miswiring
and misconnection.
Be careful not to
mistake the plus and
minus of wiring.
Short the circuit,
contact failure.
Review wires and
connection.
Motor is too old. Replace the actuator.
Operation
is unstable.
Excess surge or
voltage was
applied.
Replace the actuator.
Rainwater
entered 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.
Problem
Cause
Solution
Stop in the
mid position.
• Biting of
valve seat.
• The scale
has adhered
to the valve
trim.
Remove a foreign
object.
Clean or replace valve
parts.
(NH)
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.
Leakage
from
valve body
• Valve cap
get loose.
• Valve body is
damaged.
Replace the valve.
(NS NP)
Leakage
from
valve seat
Seat is worn
or damaged.
Replace the valve.
Replace the actuator.
Loose
seal-spring,
damage.
Replace seal-spring.
Leakage
from
valve trim
Packing is
worn or
distorted.
Replace the valve.
Tighten the gland nut.
(NH)
For more information contact
NIPPON VALVE CONTROLS, INC. for consultation.
