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46
September 2020
Service Instructions
MAN-02-08-77-0714-EN Rev. 2
Section 6: Operation
Operation
6.4.2.1
Accumulator Charge
The motor (Z) drives the hydraulic pump (Y) and discharges fluid to the nitrogen
blanket pre-charged accumulator (E).
6.4.2.2
Power Stroke ((Open/Close))
Upon completion of the accumulator charging, the pressure switch (R) set point is
reached and stops the motor. Either one of the two closing or opening solenoids (J)
or (K) are energized open and the accumulator (E) provides hydraulic pressure to
flow thru the energized solenoid, either (J) or (K) and the actuator strokes open or
closed.
6.4.2.3
ESD Operation ((Optional))
In an ESD application the ESD Solenoid (P) is constantly energized closed. This cus-
tomer supplied signal is held as long as the signal is present. Upon loss of the signal
to the ESD solenoid, the solenoid will de-energize and open allowing hydraulic
supply fluid from the accumulator (E) to pass thru the ESD solenoid and to the
closing port of the actuator (W).
6.4.2.4
Manual Hand Pump Stroke
1. Open the Hand Pump Selection Isolation Valve (M) to the pump position.
NOTE:
Both Hand Pump Selection Isolation Valves (M) must be engaged whether hand pumping
open or close.
2. Select and push the open or close knob on the Hand Pump (L).
3. Stroke the hand pump until the OPEN/CLOSE stroke is completed.
4. Push the manual relief valve located on the hand pump to retract the pump
ram back into the pump body and pull the pump handle down.
5. Upon completion of the OPEN/CLOSE hand pump stroke, return both hand
pump selection isolation valves back to the automatic position.
6.4.2.5
Accumulator override Feature ((Optional))
To stroke the actuator OPEN or CLOSED using the accumulator override isolation
valves , open valve (AD) to stroke the actuator open, or open (AE) to stroke the
actuator closed.