Emico Noah Actuation NA 006, Manual, Page: 35 / 35

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If the ACTUATOR fails to function correctly, first check for any mechanical / alignment problems,
then check for any electrical problems. See chart below for more information.
Problem Cause Solution
Manual override will not move
Level will not hold position when
pulled toward the handwheel
The handwheel is engaged and
rotated, but the output drive
bushing will not move.
The worm wheel and
mechanucal
limit stop is jammed
Worm wheel and gear
separation and failure
Mechanical limit stop is not set
correctly
Disassemble the ACTUATOR
and replace damaged gear.
Reset the mechanical limit stop
Loosen the mechanical limit stop
and the valve mounting bolts.
Correct the mechanical stop
position and then secure the
mounting bolts and limit stop
In manual operations,
the ACTUATOR will not cycle full
open or full close
Normal
operation
by remote
location
ACTUATOR will not
cycle to full open
or full close
ACTUATOR
suddenly stops
during operation
ACTUATOR will not
function from
remote location
When 3 phase operation rotates
ACTUATOR in the oppsit direction
than the signl that os applied
Limit switch malfunction and
/ or mechanical limit stop set
incorrectly
The over torque switch
has tripped
Reset the limit switch cam and
reset the machanical limit stop
Main power failure Main power check
Wire disconnect or Shot circuit Replace defective wire
Motor or condenser is damage Replace motor or condenser
Motor has over heated Do not over cycle the motor
Wiring failure Check the circuit diagram
Gears are JAMMED Release JAMMED Gears
Phase reversal
Phase reversal
Switch two of the 3 phase wires
When ACTUATOR continues to
rotate even after the cam strikes
the limit switch
Limit switch failure,
disconnect or short curcuit
Replace defective switch and
reconnect loose wire
Switch two of the 3 phase wires
※ In addition to the above described mechanical / electric failures, other causes may be the reason for a
failure based on the site conditions. For more informaion please contact EMICO for consulation. For faster
service, please have all of the nameplate information availble calling the factory.
Valves torque has increased.
Valve needs to be checked/
repaired or replaced, or the over
torque switch has failed and
needs to be reset.
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