IMO - 49 EJ/EJX (MODEL G) ELECTRIC ACTUATORS

3 MAINTENANCE
3.1 General
CAUTION: Use the correct parts. Failure to do so could result
in improper operation or personal injury. Contact your Neles-
Jamesbury distributor or representative for authentic Neles-Jamesbury
replacement parts.
I. These actuators require no lubrication, and under normal
operating conditions only periodic observation is needed to see
that they are functioning properly. Maintenance or repair requirements
other than those described herein, should be referred to
Neles-Jamesbury for service.
NOTE: These actuators are equipped with thermal overload
protection, if the actuator does not run, allow to cool before
operating. Also check to insure that the manual override shaft has
fully re-engaged.
2. To remove the EJ 20, 50 and 90 cover, remove the position
indicator pointer and cover hold down screws. To remove the
EJX20, 50 and 90 cover, remove cover hold down screws. Extreme
care must be taken to avoid any damage to mating faces of
the cover flanges of EJX actuators since scratches or nicks would
violate hazardous location rating.
3. To remove the capacitor, unplug the connector from the basic
board and remove the capacitor from the wire tie.
4. When reinstalling the cover, care must be taken not to allow
the cover to cock in relation to the base. On all EJ actuators the
cover gasket must be installed between the cover and base flanges
before reinstalling the cover. Tighten one screw partially, then
another on the opposite side of the flange, repeatingthis procedure
until all screws are partially tightened. Repeat this procedure to
fully tighten screws. On the EJX actuators replace the cover and
cover hold down screws. Care must be taken during reassembly
that no particles or dirt are on the mating surface of flanges.
4 CAM ADJUSTMENT
4.1 General
INSTRUCTIONS
There are NO TOOLS REQUIRED to adjust the cams. The cam is
a friction fit to the shaft. Cams are adjusted by rotating the cam
on the shaft by hand. When reinstalling the cover care must be
taken not to allow the cover to cock in relation to the base. On all
EJ actuators the cover gasket must be installed between the cover
and base flanges before reinstalling the cover. 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 screws. On the EJX actuators replace
the cover and cover hold down screws. Care must be taken during
reassembly that no particles or dirt are on the mating surface of
flanges. To adjust for proper valve open and close positions, the
cams for the motor control limit switches #I and #2 must be
moved as follows:
4.2 Valve Open Position:
(Switch #2) (Upper Switch)
(See Figures 3 and 5)
If the valve needs to open more, rotate the cam clockwise as viewed
from the top of the motor. (Counterclockwise on the EJ90 and
EJX90 actuators.) If less valve rotation is required, then rotate the
cam in the opposite direction. There are three slots on the outside
of each cam, these can be used to fine tune the final position of the
cam lobe into the switch lever arm. The slots will accept the blade
of a standard instrument style screw driver. The screw driver can
be used as a lever arm to aid in moving the cam on the shaft. There
is also a small “screwdriver/lever” type tool supplied with the
instruction package. This tool can be used in place of a screwdriver.
A Ball valve is fully open when the hole in the ball is in the center
of the valve body water way.
A Butterfly valve is fully open when the disc is perpendicular to the
valve body flange.
4.3 Valve Closed Position:
(Switch #I) (Lower Switch)
(See Figures 4 and 5)
If the valve needs to close more, (refer to the appropriate AMI for
proper closing position) rotate the cam counterclockwise as
viewed from the top of the motor. (Clockwise on the EJ90 and
EJX90 actuators.) If less rotation is required, rotate the cam in the
opposite direction.
NOTE: EJ20, EJ50, EJX20 and EJX50 actuator cams rotate 135
degrees, EJX90 and EJX90 actuator cams rotate 270 degrees
because of the added gear box.
5 REPLACEMENT OF A
MOTOR CONTROL LIMIT
SWITCH
(See Figure 5)
To remove a limit switch package that is not working, pry the
housing off of the mounting bracket or limit switch housing using
a small instrument type screw driver. Slide the switch package up
and off the cam/gear shaft and discard. In most cases the switch
package will be damaged during removal of the limit switch from
the housing. A new housing is supplied with every limit switch.
Each limit switch package is made up of: a limit switch housing, a
cam and a prewired 5 ampere limit switch with a female connector.
To install the switch package onto the top of an existing motor
control limit switch or switch mounting bracket, follow the steps
as outlined below:
I. Slide a fully assembled switch package over the cam/gear shaft
and snap the locking legs into the holes on top of the switch housing
or switch mounting bracket. The lowerswitch (the switch installed
first) is used to control the CLOSE position of the valve.
2. Repeat the procedure for the next switch. This switch is used
to control the OPEN position of the valve.
3. Attach the lead wire with the connector into the mating
connector on the Basic board. The connectors are labeled OPEN
and CLOSE.
4. Cam adjustment is made the same as in the Cam Adjustment
Section of this IMO.
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