Mea Hawk - Page 43

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 43
Actuator can not completely
close the valve
The pump is slipping
Over time general wear and tear may cause pump slip to increase.
This can lead to lost pump efficiency and in the worst cases the
pump is unable to generate sufficient pressure in the actuator to
close the valve/damper against a load.
Actuator with accumulator does
not complete a full stroke upon
failure
The Accumulator/Reservoir
system is either filled with too
much or too little hydraulic fluid
Log in as the Admin user to enable viewing of the Accumulator
Pressure on the HMI Home screen and determinine if the
Accumulator/Reservoir system is filled with too much or too little
hydraulic fluid:
Too Much Fluid - After the actuator strokes to the fail position
observe the Accumulator Pressure on HMI Home screen. If the
pressure remains close to the Accumulator Setpoint pressure, the
Accumulator/Reservoir system is overfilled.
Too Little Fluid - After the actuator strokes to the fail position
observe the Accumulator Pressure on HMI Home screen. If the
pressure is less than 100 psi, the Accumulator/Reservoir system is
underfilled.
If overfilled, follow the Accumulator/Reservoir Fluid and Nitrogen
Drain Procedure to completely drain the Accumulator/Reservoir
system and then follow the Accumulator/Reservoir Fluid and
Nitrogen Fill Procedure to refill the system with hydraulic fluid and
nitrogen.
If underfilled, follow the Accumulator/Reservoir Fluid and Nitrogen
Fill Procedure to refill the system with hydraulic fluid and nitrogen.
Input Command (DCS) Missing
or below 2mA alarm
The control signal has been lost
or fallen below 2 mA
A low control signal may be due to improperly landed field wiring,
physical damage to wiring, or an inadequate signal from the DCS.
Loss of feedback signal below
2mA alarm
The feedback signal has been
lost or fallen below 2 mA
A low feedback signal may be due to improperly landed field wiring,
physical damage to wiring, or a malfunction in the actuator's
position transmitter.
Valve not in position within time
alarm
The actuator has failed to reach
the desired position within time
The total time the actuator is permitted to move from the current
position to the desired position is settable in the HMI Setup screens.
Several possible causes of this alarm are:
1. The Not In Position Alarm Time is set too low. Verify the setting
in the HMI Setup screens.
2. The running speed of the actuator is set too low. Verify the
setting in the HMI Setup screens.
3. The hydraulic fluid level is low and preventing the actuator from
moving properly. Check the hydraulic fluid level indicator and verify
that the actuator is properly filled.
4. The valve/damper is physically prevented from moving due to
debris or damage.
ESD is active alarm 24 VDC ESD power has been lost
An ESD condition may be triggered by improperly landed field
wiring, physical damage to wiring, or a loss of 24 VDC ESD power.