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
9
1-5 Optional Features
1-5.1 Manual Override
Three levels of manual operators are offered:
HMI Manual Mode – If hydraulic fluid pressure and electrical power are present the user may use
the Manual mode to operate the actuator via the HMI.
Hydraulic Handpump – If the hydraulic system of the actuator is operable the user may use a
hydraulic handpump to bypass the control electronics and reposition the actuator.
Mechanical Handwheel – If neither the hydraulic system nor the control electronics are operable
the user may manually reposition the valve with a mechanical handwheel.
1-5.2 Fail to Position
The Hawk Actuator can be configured to fail in one of three positions: Extend/Clockwise, Retract/Counter-
Clockwise, or Last Position. The Extend/Clockwise and Retract/Counter-Clockwise failure positions are
achieved via compressed mechanical springs or charged hydraulic accumulators. Lower thrust/torque
Hawk models typically utilize the mechanical spring option, while higher thrust/torque Hawk models
utilize the hydraulic accumulator option.
Failure to the Extend/Clockwise and Retract/Counter-Clockwise positions may be initiated by a loss of
control signal or by one of two power losses: Loss of Main Power or Loss of Emergency Shutdown (ESD)
Power.
With the ESD Power loss option the end user must provide a separate, dedicated 2-wire ESD power supply
(typically 24 VDC) in addition to the main power supply. If this ESD power is lost the actuator will move,
depending on configuration, to either the Extend/Clockwise or Retract/Counter-Clockwise position. If the
ESD Power loss configuration is present, the actuator will fail in last position on loss of main power supply
loss. The end user must then trip the ESD Power to initiate the fail to position.
If the ESD Power loss configuration is not present, the actuator can be configured to move, depending on
configuration, to either the Extend/Clockwise or Retract/Counter-Clockwise position on loss of main
power.
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