IMO - 596
Issue Date: 12/01
INSTALLATION, MAINTENANCE, AND
OPERATING INSTRUCTIONS
FEEDBACK
POTENTIOMETER KIT
FOR ERV ELECTRIC
ACTUATORS
Read entire instructions carefully before installation or servicing
1
GENERAL
This instruction manual contains important information
regarding the installation, maintenance, and troubleshooting
of the
Jamesbury
ERV Electric Actuator Feedback
Potentiometer option. Please read these instructions
carefully and save them for further reference.
The
Jamesbury
ERV Series Actuators can be equipped with
a 1000 Ohm Feedback Potentiometer, whenever remote
indication of valve position through its full rotation is
required. This external tracking signal is variable and
proportional to the output position of the actuator.This kit
is designed for 90° rotation.
1.2 Caution
Whenever an actuator is to be removed from the valve and
then remounted, the limit switch settings must be checked
to make sure the valve is making the proper travel.
Reference IMO-593 for cam adjustment instructions.When
servicing a valve/actuator assembly, the best practice is to
remove the entire assembly from service. Refer to the valve
INSTALLATION
and
MAINTENANCE
Sections before
removing valve from the line.
1.3 General Technical Information
The standard configuration of the Feedback
Potentiometer provides 40” #22AWG wire leads for
termination outside of the actuator enclosure. For
termination inside the actuator enclosure, a 12-position
terminal block is required (Kit Number EK5117).
2
INSTALLATION
To remove the cover, remove the cover hold down screws.
EXTREME CARE MUST BE TAKEN TO AVOID ANY
DAMAGE TO MATING SURFACES. SCRATCHES OR NICKS
WOULD VIOLATE THE HAZARDOUS LOCATIONS
RATINGS OF THE ACTUATOR.
When reinstalling the cover, care must be taken not to
allow the cover to cock in relation to the base. Care must
be taken during the reassembly so that no particles or dirt
are on the mating surfaces of the flanges. Replace cover
and cover hold down screws. Tighten one screw partially,
then another on the opposite side of the flange, repeating
this procedure until all screws are partially tightened.
Repeat this procedure to fully tighten all screws.
1.1
WARNING
1.
REMOVING THE COVER, SHUT OFF ALL ELECTRICAL POWER AND
DISCONNECT ALL CONNECTIONS.
2.
TO PREVENT IGNITION OF HAZARDOUS ATMOSPHERES, DISCON-
NECT SUPPLY CIRCUIT BEFORE OPENING UNIT. KEEP ASSEMBLY
TIGHTLY CLOSED WHEN IN OPERATION.
3.
TO MAINTAIN THE HAZARDOUS LOCATION RATING OF THE ERV
ACTUATOR, IT IS ESSENTIAL THAT THE MATING OF THE SURFACES
OF THE FLANGES BE PROTECTED FROM NICKS AND SCRATCHES
WHILE DISASSEMBLED. UPON REASSEMBLY, THERE MUST NOT BE
ANY DIRT OR PARTICLES ON THE MATING SURFACES OR
FLANGES.
