Limit Switch Settings; Ccw (Open) Switch Setting; Cw (Close) Limit Switch Setting - Emerson EL-O-MATIC EL 150 Guía De Referencia

4

Limit Switch Settings

The end of travel limit switches have been factory set
for approximately 90° of valve travel. They will however
coincide with the exact end of valve travel positions.
The switches and their operating cams are located
under the limit switch bracket which is fixed to the top
of the motor.
fig. 4.1. Location of Limit Switches
Important
* Set mechanical stops before setting limit
switches.
* The switches should be adjusted after the
actuator is installed on the valve and after the
mechanical stops have been set.
* The motor is de-energized once the flatted side
of the cam is in contact with the limit switch
actuator arm, and the switch is no longer
depressed.
* Capacitor may be removed from the limit switch
bracket for better access.
* For more precise setting you can leave the allen
wrench in the cam during setting procedure.
fig. 4.2. Switch Break
Position
DOC.ATX.EL.1 Rev.: -
4.1
1 Remove actuator cover.
2 The limit switches are marked "1" for close and "2"
Limit switches
and cams
fig. 4.4 Switch Functions.
4.1.1
3 Manually or electrically rotate actuator/valve to the
Indicator shaft
4 REMOVE ELECTRICAL POWER.
5 Using a 2mm allen wrench loosen set screw on
6 Rotate green cam until switch lever arm rides on
7 Rotate cam counter-clockwise until the switch
8 Tighten set screws.
9 Electrically cycle the actuator to check switch
4.1.2
10 Manually or electrically rotate actuator/valve to the
11 REMOVE ELECTRICAL POWER.
12 Using a 2mm allen wrench loosen set screw on
13 Rotate red cam until switch lever arm rides on the
14 Rotate cam clockwise until the switch trips. This
15 Tighten set screws.
16 Electrically cycle the actuator to check switch
fig. 4.3. Initial
Position
5
Procedure
for open.
Primary Switches / cams
Extra Switches / cams

CCW (Open) switch setting

desired position.
cam.
the curved portion of the cam. (fig 1d).
trips.
This can be detected by a slight audible "click", or
use a battery powered test light across terminal 8
and 10.
setting.

CW (Close) limit switch setting

desired position.
cam.
curved portion of the cam (fig 1d).
can be detected by a slight audible "click", or use a
battery powered test light across terminal 5 and 7.
settings.
1 CLOSED (red)
2 Open (green)
3 (gray)
4 (gray)
May '03