Mea Hawk Manual

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Hawk
Instruction and Operation Manual

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 2
TABLE OF CONTENTS
i. Safety Information ............................................................................................................................................................................ 5
ii. Intended Use of the Hawk Actuator ......................................................................................................................................... 6
iii. Environmental Considerations ................................................................................................................................................... 7
1. GENERAL DESCRIPTION ................................................................................................................................................................ 7
1-1 About MEA Inc. ........................................................................................................................................................................ 7
1-2 Customer Support .................................................................................................................................................................. 7
1-3 The Hawk Actuator ................................................................................................................................................................ 8
1-4 Hawk Design Features .......................................................................................................................................................... 8
1-4.1 Linear Actuator ................................................................................................................................................................ 8
1-4.2 Rotary Actuator ............................................................................................................................................................... 8
1-5 Optional Features ................................................................................................................................................................... 9
1-5.1 Manual Override ............................................................................................................................................................. 9
1-5.2 Fail to Position ................................................................................................................................................................. 9
1-5.3 Seat Protection ............................................................................................................................................................. 10
1-6 General Specifications ....................................................................................................................................................... 10
1-7 Area Approvals ..................................................................................................................................................................... 11
1-8 Operating Temperatures .................................................................................................................................................. 12
1-8.1 Thermal Jackets & Heat Tracing ............................................................................................................................ 12
1-9 Special Tool Requirements .............................................................................................................................................. 13
2. SHIPPING, HANDLING, STORAGE .......................................................................................................................................... 14
2-1 Delivery .................................................................................................................................................................................... 14
2-2 Receipt ..................................................................................................................................................................................... 14
2-3 Storage .................................................................................................................................................................................... 14
2-4 Unpacking .............................................................................................................................................................................. 14
3. THEORY OF OPERATION & DESIGN ..................................................................................................................................... 15
3-1 Design Principle ................................................................................................................................................................... 15
3-2 Linear Actuator ..................................................................................................................................................................... 16

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 3
3-3 Rotary Actuator .................................................................................................................................................................... 17
3-4 Multiple Motor/Pump Units ............................................................................................................................................ 18
3-5 Hawk Model Number ........................................................................................................................................................ 19
4. Controls ............................................................................................................................................................................................ 20
4-1 Control Modes ...................................................................................................................................................................... 20
4-2 Speed and Response Tuning .......................................................................................................................................... 20
4-2.1 Multiple Motor/Pump Speed & Response Tuning ........................................................................................ 21
4-3 Control Signal and Position Calibration ..................................................................................................................... 23
4-4 Failure Modes & Limit Switches .................................................................................................................................... 27
5. INSTALLATION ............................................................................................................................................................................... 28
5-1 Electrical Installation Checklist ....................................................................................................................................... 28
5-1.1 Proper Protective Earthing ...................................................................................................................................... 28
5-2 Actuator Alignment ............................................................................................................................................................ 28
5-2.1 Linear Actuator Alignment ...................................................................................................................................... 28
5-2.2 Rotary Actuator Alignment ..................................................................................................................................... 29
5-3 Mechanical Installation Checklist .................................................................................................................................. 29
5-4 Hydraulic Fluid Level Indicator ....................................................................................................................................... 29
5-5 Hydraulic Power Source (HPS) & Actuator Fluid Fill Procedure........................................................................ 30
5-6 Accumulator/Reservoir System ...................................................................................................................................... 32
5-7 Accumulator/Reservoir Fluid and Nitrogen Drain Procedure ............................................................................ 33
5-8 Accumulator/Reservoir Fluid and Nitrogen Fill Procedure ................................................................................. 34
5-9 Safe Seat System.................................................................................................................................................................. 36
5-10 Safe Seat Adjustment ...................................................................................................................................................... 37
5-11 Safety Precautions ............................................................................................................................................................ 38
5-11.1 Releasing Accumulator/Reservoir Stored Energy ........................................................................................ 38
5-11.2 Releasing Safe Seat Stored Energy .................................................................................................................... 39
6. MAINTENANCE .............................................................................................................................................................................. 40
6-1 Quarterly Inspection/Maintenance ............................................................................................................................... 40

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 4
6-2 Five Year Inspection/Maintenance ............................................................................................................................... 40
6-3 Ten Year Inspection/Maintenance ................................................................................................................................ 41
7. TROUBLESHOOTING ................................................................................................................................................................... 41

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 5
i. Safety Information
As with any powered industrial equipment, when installing, operating, or servicing a Hawk actuator the
technician or operator needs to be aware of potential safety risks prior to performing any operation.
Hawk actuators contain hydraulic fluids under high pressure, hazardous electrical voltage, and can
develop large forces. In addition, some units may have stored energy devices which must be taken into
account when setting up, operating and servicing these particular units. It is highly recommended that
the operator fully familiarizes themselves with this manual and its procedures prior to performing any
operation on the Hawk actuator.
Attention
Important information follows. Material should be reviewed prior to proceeding.
Hazardous Voltage / Shock Hazard
Proper Lock out and Tag Out procedures must be followed prior to access.
Crush or Pinch Point Hazard:
Extreme caution must be taken when installing or performing any mechanical work on the
actuator. Many areas presenting a pinch point hazard are present. Appropriate personal
protection equipment and suitable clothing must be worn. Be sure to never place any part of
your body in an area that presents a crush or pinch point hazard.
Shock Hazard:
High voltage levels are present in the control enclosure. Extreme caution must be taken when
performing electrical work. It is highly advised that qualified technicians install and service any
device.
Explosion Hazard:
Only remove the Hydraulic Power Source (HPS) cover when the area is free of ignitable
concentrations.
Only disconnect wiring while the circuit is not live and when the area is free of ignitable
concentrations.

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 6
Stored Energy, Spring Tension:
Some Hawk configurations incorporate compressed springs as fail-safe mechanisms. Any work
performed with a compressed spring can result in personal injury and/or equipment damage if
the proper safety precautions are not taken. The spring must be completely decompressed prior
to beginning any work.
Stored Energy, Accumulator Pressure:
Some Hawk configurations incorporate pressurized accumulators to achieve stroking speed
requirements, to act as fail-safe mechanisms, or as part of the Safe Seat feature. During normal
operation, the accumulator will be pressurized. Failure to understand the operation of the
accumulator system may lead to personal injury and/or equipment damage due to
improper/inadvertent operation. Any work performed with a pressurized accumulator can result
in personal injury if proper precautions are not taken. The accumulator must be de-pressurized
prior to beginning any service work on the actuator.
Manual Handwheel Assembly:
When the Manual Hand Pump or Manual Handwheel Assembly is in use, be sure to use proper
Lock Out and Tag Out procedures to prevent personal injury or process interruption.
ii. Intended Use of the Hawk Actuator
Under no circumstances should the Hawk actuator be used for any purposes outside of its intended use.
Misuse of the unit can lead to harmful consequences including damage to critical components and
serious injury to the operator.

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 7
iii. Environmental Considerations
This equipment is designed for the following environmental conditions:
Area Outdoor Use
Ambient Temperature -40 °F to +150 °F (-40 °C to +65 °C)
Humidity 90% relative humidity for temperatures up to +150 °F (+65 °C)
Supply Voltage Fluctuations ±10%
Dust and Water Protection Per IP 66 requirements
1. GENERAL DESCRIPTION
1-1 About MEA Inc.
MEA INC has engineered, designed, and built custom hydraulic actuation solutions for over 50 years.
Specializing in electro-hydraulic actuator control systems for critical valves and dampers, our integrated
teams can build to nearly any requirement, delivering a robust and reliable solution built for decades of
operation. Lifecycle support is a cornerstone of our business, offering innovative service solutions that
facilitate ease of maintenance and dependability of critical equipment. Our global footprint gives us
agility and expertise that is always close by.
1-2 Customer Support
MEA Inc. is led by professional and experienced personnel geared towards providing the full satisfaction
of our clients with our state of the art product lines. In addition to our factory service and sales
departments, MEA also employs a worldwide team of representatives to ensure help is never far away.
For service, sales, warranty or technical support, please contact our facility at the following:
MEA Incorporated
2600 American Lane
Elk Grove Village, IL, 60007
T: [phone]
F: [phone]
For further information, visit our website at www.meaincorporated.com

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 8
1-3 The Hawk Actuator
The Hawk is a high-performance, rugged line of linear and rotary electro-hydraulic actuators and drives. It
is ideal for applications requiring high duty cycles, large thrust and torques, or fast stroking speeds. The
Hawk’s modular electro-hydraulic system is easily configurable to suit specific valve or damper control
requirements while at the same time providing safe and virtually maintenance free performance.
1-4 Hawk Design Features
 100% continuously modulating duty cycle
 Low installation cost - simple power & control input connection, mounting flexibility
 High-speed operation
 Complete control – low dead-band, fast response, superior linearity & repeatability
 Automatic fail-safe position and ESD functions for safety applications
 Low power consumption, motor only runs when actuator moves
 Digital control electronics
 Programmable operating parameters such as speed, position limits, acceleration, deceleration,
deadband
 Built in alarms and diagnostic features
1-4.1 Linear Actuator
 Stroke lengths up to 100”
 Thrust output up to 100,000 lbf
 Stroke speeds up to 0.2 sec/inch of travel depending on cylinder size and motor/pump selections
1-4.2 Rotary Actuator
 Rotation up to 180°
 Torque output up to 400,000 in-lbs
 Stroke speeds up to 0.5 sec/90° depending on cylinder size and motor/pump selections

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
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.

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 10
1-5.3 Seat Protection
Electro-hydraulic actuation, such as the Hawk, can create extremely high seating thrust or torque. In some
cases, applying excessive actuator force while in the seated position can permanently deform the seating
surface, which may lead to process fluid leak by. The Hawk’s Safe Seat feature protects the valve in two
ways, by hydraulically limiting the maximum force the actuator applies to the valve in the seated position
and by maintaining a constant force on the seated valve. Since the Safe Seat is a hydraulic system it is
precise, adjustable, and rugged.
1-6 General Specifications
Construction
& Control
Actuator Type
Electro-Hydraulic, Self-Contained, Servo Motor Powered
Duty Cycle
100% Continuously
Modulating Duty Cycle
Power Supply
24-48 VDC, 1 PH, 50/60 HZ
110-120 VAC, 1 PH, 50/60 HZ
208-240 VAC, 1 PH, 50/60 HZ
208-240 VAC, 3 PH, 50/60 HZ
380-408 VAC, 3 PH, 50/60 HZ
Control Signal
4-20 mA Command Signal
24 VDC Pulse
115 VAC Pulse
Feedback Signal
4-20 mA Output
Feedback Type
4-20 mA Non-Contact Electromagnetic
Failure Mode
Loss of Signal
Loss of Power
Hydraulic Pressure
2000 psig
Hydraulic Fluid
Synthetic Gear Oil (AGMA Grade 4)
Hydraulic Pump
Positive Displacement Gear Type
Pump Capacity
0.168 gpm (Small)
0.554 gpm (Medium)
1.12 gpm (Large)
2.24 gpm (XL)
3.33 gpm (Mega)
6.61 gpm (Mega XL)
Stored Energy
Spring or Accumulator
Internal Reservoir
Integral, Sealed and Pressurized (10-20 psi)
Electrical Protection
Fused
IP Rating
IP Rating 66

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 11
Accessories & Options
Failure Positions
Fail Last Position (Standard)
Fail Open
Fail Closed
Failure Methods Accumulator
Spring
Emergency Shutdown (ESD) Loss of 24 VDC ESD Signal
Limit Switches Electronic
Proximity Type, SPDT
Manual Override
Electronic HMI (Standard)
Mechanical Handwheel
Hydraulic Handpump
Performance
Speed
Adjustable from 25% to 100% of Rated HPS Speed
Resolution
0.1% of Stroke
Repeatability
0.05% of Stroke
Deadtime
80 ms
Deadband
Adjustable from 0.05% to 5% of Stroke
1-7 Area Approvals
The Hawk actuator and control enclosure must only be installed in areas which are appropriate for each
item’s respective area approval.
Actuator
Cl 1, Div 2, Groups A, B, C, D (Standard)
Cl 1, Div 1, Groups B, C, D (Optional)
Note: Carries Intertek ETL Listed Mark and is tested to CSA standards
Control Enclosure
NEMA 4X (Standard)
Cl 1, Div 2, Groups B, C, D (Optional)
Cl 1, Div 1, Groups B, C, D (Optional)

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 12
1-8 Operating Temperatures
The Hawk actuator and control enclosure must only be installed in areas which are appropriate for each
item’s respective temperature rating.
Actuator
Standard
-20 °F to +130 °F (-29 °C to +55 °C)
Cold Weather Package
-40 °F to +110 °F (-40 °C to +43 °C)
Cold Weather Package
with Thermal Jacket & Heater
-75 °F to +110 °F (-60 °C to +43 °C)
High Temperature
-20 °F to +150 °F (-29 °C to +65 °C)
Operating the actuator outside of the rated temperature range may impact hydraulic fluid viscosity which
will impact both actuator speed and thrust/torque output.
Control Enclosure
Standard
-20 °F to +120 °F (-29 °C to +49 °C)
Cold Weather Package
-40 °F to +120 °F (-40 °C to +49 °C)
1-8.1 Thermal Jackets & Heat Tracing
Thermal jackets with integrated heat tracing are required for the Hawk actuator to operate in
temperatures below -20 °F (-29 °C). Each thermal jacket provided by MEA Inc is manufactured with the
actual actuator dimensions in mind. The heat tracing power supply, junction boxes, and fittings are not
supplied by MEA Inc. and must be field wired by the user.
Thermal Jackets & Heat Tracing
Insulation
1.5” Thickness, Teflon Impregnated Fiberglass Cloth
Temperature Regulation
Self-Regulating, No Thermostat Required
Power Supply
120 VAC, 50/60 HZ
240 VAC, 50/60 HZ
Field Connection
2-Wire, 16 AWG
Electrical Protection
20 Amp Fuse Recommended (Customer to Provide)
Maximum Temperature
150
°F (65 °C) when Energized
185
°F (85 °C) when De-energized
Area Approvals
Cl 1, Div 2, Groups B, C, D (Standard) 1
Note 1: CSA and UL Rated

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 13
The heat output of the heat tracing, shown below, is self-regulating and dependent on ambient
temperature.
Figure 1-8.1 Heat Trace Output
1-9 Special Tool Requirements
The following tools required for Hawk installation and maintenance may be considered special. Standard
hand tools are used for all other installation and maintenance procedures.
 Hydraulic Fluid Fill Gun
 Nitrogen Fill Kit (Only applicable to actuators with Accumulator or Safe Seat features)

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 14
2. SHIPPING, HANDLING, STORAGE
2-1 Delivery
For items that will be shipped parcel, a rigid box will be used to support the items during shipment. Each
item within the box will be wrapped separately. The packing material used will be sufficient to prevent
items from damage as a result of typical shipping conditions. The box shall be sealed with reinforced
sealing tape.
For items that will be shipped freight, a pallet will be used to package the items/boxes together. The
pallet will be sized to prevent overhang of items being shipped and with rigidity sufficient to support the
load. Boxes that are being stacked on a pallet shall be packed per the above parcel packing. The items
will be strapped or banded to the pallet and wrapped to prevent articles from being separated.
For items that require crating, the crating used will be sufficient to prevent items from damage as a result
of typical shipping conditions via land or sea.
2-2 Receipt
MEA strives to package our products to avoid damage during shipment. However, do to unforeseen
circumstances, at times damage may occur. When products are received inspect the shipping container
and make note of excessive physical damage. If any products are believed to be damaged due to
shipping, the shipment may be rejected, and the freight company should be contacted and a damage
claim made.
2-3 Storage
It is highly recommended that all MEA products are stored in a controlled environment and remain in
their original shipping container during the duration of storage. The recommended storage environment
for all MEA products shall be clean, non-corrosive, dry, and at a temperature between +32 °F and +100 °F
(0 °C and +38 °C).
2-4 Unpacking
When local shipping laws allow, the MEA Hawk actuator is shipped pre-filled with hydraulic fluid and fully
prepared for installation. The system has been operated, tested, and inspected thoroughly to meet
quality and performance requirements. After removing the actuator system from its packaging, please be

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 15
sure to inspect for any indications of damage that may have occurred during shipping. If any signs of
damage are detected, please contact MEA Inc immediately to determine the appropriate corrective action.
In addition, verify that the received items match the accompanying packing list. If any discrepancies exist,
please contact MEA Inc immediately to determine the appropriate corrective action.
3. THEORY OF OPERATION & DESIGN
3-1 Design Principle
The Hawk’s Hydraulic Power Source (HPS) design utilizes a bi-directional gear pump directly coupled to a
servo motor. In conjunction with the pump & motor, electronically controlled solenoid valves are used to
sequence flow operations. Servo motors are ideally suited for this application due to their ability to
reverse direction, operate with variable speed, and maintain a fixed speed when being over-driven.
When the actuator is moving, all fluid passes through the pump, permitting a controlled variable rate
addition or dissipation of energy. The pump and servo motor control fluid flow rate and direction while
the solenoids only perform lock in place functions, not fluid flow regulation. The speed of the unit is a
function of pump displacement and cylinder volume only.

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 16
3-2 Linear Actuator
The linear version of the Hawk actuator consists of a single, double-acting, equal displacement cylinder,
which in combination with pressurized fluid from the HPS, creates linear movement of the driven device.
In Control mode, the actuator receives a desired position signal from the DCS. This signal is compared to
the current position signal provided by the actuator’s position feedback. The difference between the
desired position and current position is the deviation. If this deviation exceeds the user defined deadband
the servo driver begins the process of moving the actuator by first energizing the motor, which in turn
spins the pump. For a brief period, less than 80 ms, the pump builds pressure in the system before the
solenoids are energized. Once sufficient system pressure is generated, the solenoids open and the
hydraulic fluid moves the cylinder and the driven device.
Ultimately, the actuator will move the driven device in the direction that will decrease the deviation to 0%
± the deadband. Once reaching this position the servo motor and solenoids will de-energize and the
actuator will remain in place until the next deviation occurs.
Figure 3-2.1 Linear Hawk Hydraulic Schematic

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 17
3-3 Rotary Actuator
The rotary version of the Hawk actuator consists, depending on required torque output, of either one or
two double-acting, equal displacement cylinders which in combination with a rack and pinion linkage and
pressurized fluid from the HPS, creates rotary movement of the driven device. In Control mode, the
actuator receives a desired position signal from the DCS. This signal is compared to the current position
signal provided by the actuator’s position feedback. The difference between the desired position and
current position is the deviation. If this deviation exceeds the user defined deadband the servo driver
begins the process of moving the actuator by first energizing the motor, which in turn spins the pump.
For a brief period, less than 80 ms, the pump builds pressure in the system before the solenoids are
energized. Once sufficient system pressure is generated, the solenoids open and the hydraulic fluid
moves the cylinders and the driven device.
Ultimately, the actuator will rotate the driven device in the direction that will decrease the deviation to 0%
± the deadband. Once reaching this position the servo motor and solenoids will de-energize and the
actuator will remain in place until the next deviation occurs.
Figure 3-3.1 Rotary Hawk Hydraulic Schematic

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 18
3-4 Multiple Motor/Pump Units
For applications that require large thrust/torque output or fast stroking speeds it is possible a secondary
motor/pump unit will be used in tandem with a standard HPS. The secondary power unit pumps a large
volume of hydraulic fluid to move large displacement cylinders quickly, while the smaller displacement
HPS pump maintains the ability to provide fine positioning.
The system operates on the principal that both motor/pumps operate when large actuator movements
are required, but only the HPS motor/pump operates for smaller movements. In addition, even when the
secondary motor/pump is used it is de-energized prior to completion of the actuator movement and the
HPS alone is responsible for the final, fine positioning.
Using the large, secondary pump only would create excess mechanical gain in the actuator system and
would require a proportionally larger deadband to maintain controllability, while using the HPS alone
would provide the fine positioning required, but would not deliver the stroking speeds needed. The
solution is to utilize both a large displacement and small displacement pump in the same system utilizing
the advantages of both and neutralizing the disadvantages of using either individually.

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 19
3-5 Hawk Model Number

MEA INC
2600 American Lane | Elk Grove Village, IL 60007 | USA
T [phone] | F [phone]
COMPLETE CONTROL
www.meaincorporated.com
MEA Incorporated | Hawk Actuator Instruction and Operation Manual
02/2018 20
4. Controls
4-1 Control Modes
It is important that users familiarize themselves with the functions of each mode of operation. Failure to
understand the actuator operation can result in unexpected performance and an increased chance of
personal injury. For more information on unit installation and start-up refer to Section 5.
Manual
In the Manual mode, the actuator will be under the control of the HMI only and will not respond to a DCS
control signal. This mode provides manual jogging of the actuator for purposes of initial calibration,
hydraulic fluid drain and fill, maintenance, etc.
Control
In Control mode, the actuator receives a desired position signal from the DCS. This signal is compared to
the current position signal provided by the actuator’s position feedback. If the difference between the
desired position and current position exceeds the user defined deadband the actuator will move to the
desired position. The Hawk actuator may be configured to receive 4-20 mA analog control signals or
pulse control signals.
Standby
In Standby mode, the actuator is offline and will not respond to a DCS control signal.
Setup
In Setup mode, the actuator is offline and will not respond to a DCS control signal.
4-2 Speed and Response Tuning
The Hawk speed and response tuning can be configured by the user within the Setup menu.
Intermediate Window
All Hawk actuators operate in two speed modes. A faster speed for large position changes and a slower
speed for fine-positioning. This setting determines the point at which the actuator switches from the
faster to the slower speed and is entered as a percentage of actuator movement.
Run Intermediate
Sets the slower, fine-positioning actuator speed.