Installation, Operation and Maintenance Manual
VCIOM-15345-EN Rev. 1
February 2022
41
Operation
Section 6: Operation
6.4.5
Power Stroke of Accumulator Based Actuator (OPEN/CLOSE/Modulation) (Optional)
During a normal power cycle, the motor drives the hydraulic pump. Hydraulic fluid from
the pump is forced into the Accumulator and pressurizes the accumulator. Hydraulic Power
Cylinder moves the actuator to the OPEN/CLOSE position which compresses the spring in
the Spring-Return Module.
For the Next Power Cycle, the pressure from the accumulator is used instead of the Pump.
When the accumulator pressure goes beyond the set limit, the accumulator pressurizes
automatically until the Power is reset or the Selector Switch is turned to OFF Position.
After Power reset or Selector Switch turned from OFF to LOCAL or REMOTE Position, the
accumulator charges only after the command to Actuator Operation.
6.4.6
Accumulator Opening Manual Override ((Optional))
1.
Close Isolation Valve (8) to isolate the Solenoid Valves if Valve (17) is in Failed
open mode.
2.
Turn the handle of Isolation Valve (22) 180° to the right, the Accumulator will
power stroke the actuator to OPEN/CLOSE position.
3.
Close isolation valve (22) by turning 180° to the left. The actuator Spring-Return
moves to full OPEN/CLOSE position. Open Isolation Valve (8).
6.4.7
Manual Handpump Power Stroke
1.
Close Handpump Isolation Valve (8).
2.
Stroke Handpump (13) until the OPEN/CLOSE stroke is complete.
3.
Open Handpump Isolation Valve (8) when the handpumping is complete.
NOTICE
If equipped with ESD, DO NOT open Handpump Isolation Valve (8) before the customer
supplied ESD Signal is present.
4.
To stroke the actuator to the Fail-Safe Position, if required, slowly open Manual
Bypass Valve (Lockable) (19).
NOTICE
Manual Bypass Valve (Lockable) (19) must be closed to enable any mode of operation.
Handpump Isolation Valve (8) must be open for normal operation.
