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Thomson

Thomson Electrak

®

 MD Actuator - Installation Manual - 2020-02

21

5.2.3  Sleep operation

The Electrak MD utilizes a sleep mode operation when positioning is no longer required. This feature 

allows for a constant battery connection with minimal drain while the engine or vehicle is not running. 

After 5 seconds of bus inactivity, the actuator will put itself in a state of sleep. During this state the 

quiescent current is <1 mA for 12 Vdc models and <2 mA for 24 Vdc models. When bus activity is 

restored the actuator will begin a wake up phase, followed by an address claim request.

5.2.4  J1939 actuator control message (ACM)

All actuator control parameters are adjustable through the proprietary A message (PGN 61184). The 

preferred transmission repetition rate is 100ms (can also be sent as required by the application.) 

Additional message specific information can be found in the table below, all other Proprietary A 

information can be found in the SAE J1939/21 specification.

 

5.2.4.1  Position command

This 14-bit signal is used to set the target position for the next actuator motion. Although resolution 

of the signal is represented as 0.1 mm/bit, true positional accuracy will be dependent on the stroke 

length of the given model. The actuator uses an internally calculated deadband value to determine 

when within a target position range. The 0.0 mm and full extend stroke values represent 0 to 100% 

stroke and are only relative to the actual available stroke of the individual unit.

Range: 0.0 mm to 300.0 mm

Resolution: 0.1 mm/bit, 0 offset

5.2.4.2  Current limit

This 9-bit signal is used to set a current at which the actuator will cease motion. In the event a 

force is applied to the actuator that causes the motor current to exceed this settable value for more 

than 50 ms, the actuator will stop any current motion and activate a dynamic braking effect on the 

motor. This current limit does not apply during the motor starting phase where in rush current can be 

significantly higher than normal running. The max. current for each individual actuator can be found 

on the product label.

Range: 0.0 A to 8.0 A (12 Vdc actuator), 0.0 A to 4.0 A (24 Vdc actuator) 

Resolution: 0.1 A/bit, 0 offset

5.2.4.3 Speed command

This 5-bit signal is used to set the speed of the actuator. The signal adjusts the PWM driver within 

the actuator and the voltage applied to the motor. The resultant actuator speed will be a ratio of the 

actuators max speed and also dependent on the load applied to the actuator.
Range: 20% to 100% motor duty cycle 

Note: The PWM driver will not provide enough voltage for the motor to operate properly below 20% utilization, therefore, 20%  
shoud be considered a lower limit for speed control. 

 

Resolution: 5%/bit, 0 offset

5.2.4.4 Motion enable

This 1-bit signal is used to enable motion from the actuator. If this bit is low (0), no motion will be 

allowed. This signal can be used to define the next actuator movement message without starting the 

motor. When movement is required this bit can be changed to high (1) and motion will begin using 

the other parameter signals encoded in the ACM.

Actuator Control Message Signal Information

Start position

Length

Parameter name

1.1

14 bits

Position command

2.7

9 bits

Current limit

3.8

5 bits

Speed command

4.5

1 bit

Motion enable

4.6

35 bits

Factory use

The least significant bit of each message is indicated by the start position column

Summary of Contents for Electrak MD Series

Page 1: ...Thomson Electrak MD Electric Linear Actuator Installation Manual Edition 2020 02 www thomsonlinear com...

Page 2: ...as to the suitability of the product for any particular use or purpose For a copy of the entire warranty for this product that is contained in our standard terms and conditions of sale please go to ht...

Page 3: ...3 1 EC Declaration of conformity 5 4 Installation 6 4 1 Product label 6 4 2 Terminology 6 4 3 Operation environment 6 4 4 Mechanical installation 7 4 5 Electrical installation 10 4 6 Control options...

Page 4: ...packaging supplied by Thomson The temperature during transportation and storage must be between 40 to 85 C 40 to 185 F Avoid shocks to the package If the package is damaged check the actuator for vis...

Page 5: ...in any way and notify an appropriate person so that corrective actions can be taken Never open the actuator as that will compromise the sealing and the function of the actuator There are no serviceabl...

Page 6: ...please provide the serial number manufacturing date and the designation of the actuator s in question You can also use the QR code on the label to directly access Electrak MD information on www thomso...

Page 7: ...sidered to ensure it does not create harm 4 4 2 Basic installation considerations 1 Only mount the actuator using the holes in the rear a and front b adapters Check the model number on the actuator pr...

Page 8: ...able connector cover plate 1 The cover plate is held in place by a screw M2 5 with Torx T8 head that can be accessed through the hole in the top of the cover plate a Keep in mind to mount the actuator...

Page 9: ...ustomer connections In the other end the cable is integrated in to the cable connector cover plate b section 4 4 4 The plug in connector allows replacing the actuator without disconnecting the flying...

Page 10: ...ed If using an AC powered power supply it must be sized to handle the inrush current batteries typically have no problem delivering the inrush current Also contacts switches and relays must be sized a...

Page 11: ...od attempted to use the control will either keep the speed stop or be permanently damaged and cause malfunction 4 6 3 How to determine the control option Electrak MD is equipped with one of the contro...

Page 12: ...blue orange violet brown grey red white black white XXX Control Option Specifications Input voltage MD12 MD24 Vdc 9 16 18 32 Max actuator current draw A see product label F Fuse S1 Double pole double...

Page 13: ...the current move is finished in the situation where voltage or temperature are outside their normal operating ranges Once within the normal operating range the actuator will automatically reset and n...

Page 14: ...ontrol Option Specifications Input voltage MD12 MD24 Vdc 9 16 18 32 Max actuator current draw A see product label Potentiometer type wirewound Potentiometer max input voltage Vdc 32 Potentiometer max...

Page 15: ...ator and less the 2 mA for a 24 Vdc actuator The sleep mode will exit and return to normal operation when the next move command is received Dynamic braking throughout the entire stroke length whenever...

Page 16: ...d black to Vdc in the power cable To extend the actuator apply Vdc to violet and to retract apply Vdc to orange in the signal cable while applying Vdc to grey F Fuse S1 Extend switch S2 Retract switch...

Page 17: ...Fuse S1 Extend switch S2 Retract switch LXP Control Option Specifications Input voltage MD12 MD24 Vdc 9 16 18 32 Max actuator current draw A see product label Potentiometer type wirewound Potentiomet...

Page 18: ...fications Input voltage MD12 MD24 Vdc 9 16 18 32 Max actuator current draw A see product label Potentiometer type wirewound Potentiometer max input voltage Vdc 32 Potentiometer max power W 1 Potentiom...

Page 19: ...nd by applying Vdc to pin 6 violet wire and to retract by by applying Vdc to pin 5 orange wire When this is done the actuator will move with its maximum allowed settings 4 6 12 2 CAN Bus SAE J1939 ins...

Page 20: ...elected address the actuator will continue to request other addresses until it finds one that it can claim 2 The Electrak MD device can also use the commanded address PGN to select a specified address...

Page 21: ...o set a current at which the actuator will cease motion In the event a force is applied to the actuator that causes the motor current to exceed this settable value for more than 50 ms the actuator wil...

Page 22: ...ances or play in the actuator Range 0 0 mm to 300 0 mm Resolution 0 1 mm bit 0 offset 5 2 5 2 Measured current This 9 bit signal is used to inform the user of the actual current being drawn used by th...

Page 23: ...vibration being applied to the actuator 5 2 5 9 Parameter flag This 1 bit signal is used to inform the user that one of the parameter signals in the ACM is outside the allowed parameters the specific...

Page 24: ...fatal error message The actuator has encountered an uncommanded change in the stroke feedback device potentiometer The user can reset the actuator first to try and clear the error but if that does not...

Page 25: ...oad duty cycle 25 C see product label Restraining torque Nm lbf in 0 internally restrained Motor leads cross section mm2 AWG 0 75 18 Signal leads cross section mm2 AWG 0 35 22 Cable length depending o...

Page 26: ...dular Control System options XXX internal end of stroke limit switches XXP XXX analog potentiometer position output EXX Electronic Monitoring Package EXP EXX analog potentiometer position output LXX E...

Page 27: ...Thomson Thomson Electrak MD Actuator Installation Manual 2020 02 27...

Page 28: ...llo 95 97 20834 Nova Milanese MB Phone 39 0362 366406 Fax 39 0362 276790 E mail sales italy thomsonlinear com Spain Thomson E mail sales esm thomsonlinear com Sweden Thomson Estridsv g 10 29109 Kristi...

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