Mea Hawk - Page 35

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T +1 847 766 9040 | F +1 847 350 1951
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 35
6) Reattach all disconnected tubing. It is acceptable if a small amount of hydraulic fluid (~1/4 cup)
escapes from reservoir during this process.
7) Charge accumulator and reservoir with nitrogen to pressures that are approximately 100 psi
greater than their respective pre-charge pressures listed on the actuator’s specification sheet.
8) Allow 10-15 minutes for the nitrogen temperature and pressure to stabilize. Check the nitrogen
pressure in the accumulator and reservoir and bleed off excess pressure until the pressures are
equal to their respective pre-charge pressures.
9) Power up the unit. Leave shutoff ball valves closed.
10) Login as the Admin user so that the accumulator pressure transmitter readings can be observed
on the HMI.
11) Open shutoff valves.
12) Change the Accumulator Setpoint on the home screen of the HMI to be equal to accumulator
pre-charge pressure + 50 psi (i.e. if the accumulator pre-charge pressure is 1900 psi, change the
Accumulator Setpoint on the HMI to 1950 psi).
13) Using the HMI put the actuator into Control mode to initiate the accumulator recharge sequence.
The motor/pump will run as the accumulator recharges. Verify that Accumulator Pressure readout
on the home screen of the HMI rises during recharge process.
14) During the recharge process, observe the hydraulic fluid indicator in the HPS and add fluid as
required to move the indicator to the full position.
15) Once the recharge sequence has finished the actuator will be in Control mode and will reposition
according to the control signal. Once the actuator moves to the position dictated by the control
signal, use the HMI to place the actuator into Manual Mode.
16) Using Manual mode on the HMI move the actuator to the opposite direction of the accumulator
failure position (i.e. if the accumulator closes the valve, move the valve to the fully open position).
17) Trip the accumulator. Depending on the actuator configuration, this may be done by losing
signal, losing main power, or losing ESD power.
Note: For this first accumulator failure cycle, the unit will most likely not fully stroke to the
accumulator fail position.
18) Return the actuator to the non-failure state, whether that be by restoring control signal, main
power, or ESD power.