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34
September 2020
Service Instructions
MAN-02-08-77-0714-EN Rev. 2
Section 4: Set-up/Start-up Procedure
Set-up/Start-up Procedure
4.8.4
Open Limit Switch Adjustment
4.8.4.1
With the actuator in the Open Position, rotated fully counterclockwise,
the Target for OPEN LS-1 will need to be adjusted.
4.8.4.2
Reconnect electrical power to the unit.
4.8.4.3
Push down on the Target for OPEN LS-1 and move counterclockwise until
it is off of the switch in the counterclockwise direction. Both the OPEN
and the CLOSE lights on the LDM should be illuminated at this point.
4.8.4.4
Now, push down and slide the Target for OPEN LS-1 clockwise until the
CLOSE light just goes out. It is important to always adjust a Target in the
opposing direction of the valve travel to get an accurate setting.
4.8.4.5
With the LOCAL/OFF/REMOTE Selector Switch set to LOCAL, toggle the
OPEN/CLOSE Selector Switch to CLOSE and allow the Actuator to travel to
the Close position, rotated fully clockwise.
4.8.4.6
Push down and slide Target for CLOSE LS-2 counterclockwise until it is off
the switch in the clockwise direction.
4.8.4.7
Now, push down and slide the Target for CLOSE LS-1 clockwise until the
OPEN light just goes out.
4.8.4.8
Toggle the OPEN/CLOSE Selector Switch to OPEN and allow the actuator
to rotate counterclockwise to the fully open position and check to see
OPEN LS-2 is operated; the CLOSE light should go out. Cycle the actuator
open and closed a few times, checking the setting of CLOSE LS-1 and
OPEN LS-2.
4.8.5
Four Limit Switch Models
4.8.5.1
If your unit utilizes four switches LS-3 OPEN and LS-4 CLOSE, adjust in
the same manner except you will need to use a continuity tester on the
terminal strip to detect switch operation. LS-3 is connected to terminals
A31, A32 and A33. LS-4 is connected to A35, A36 and A37. Look at these
switches on the wiring diagram for exact configuration.
4.9
Function Test
4.9.1
Double-Acting Actuator without an ESD Solenoid Valve
NOTE:
The components referenced below are referencing Schematic 4.8.1. and is for illustration
purposes only. When using this procedure refer to the Bettis EHO Actuator General
Arrangement Drawing and Hydraulic Schematic for the unit being worked on.
4.9.1.1
Ensure both Hand Pump Selector Valves (M) are in the automatic
open position.
4.9.1.2
Energize the desired solenoid valve (J) to open the actuator or (K) to close
the actuator.
4.9.1.3
Toggle the OPEN/CLOSE Selector Switch to start the Electric Motor. The
Hydraulic Pump Draws Fluid from the Reservoir and discharges fluid thru
either the opening solenoid (J) or the closing solenoid (K) which ever one
is energized.
4.9.1.4
Upon completion of the open or close stroke, the Pressure Switch will
reach its set point and stop the Electric Motor.