Configuration Options
AR = External Anti-rotate Assembly
This option provides a rod and bushing to restrict the actuator rod from rotating when the load is not held by another method. Shorter actuators have single sided anti-rotation attachments. Longer lengths require attachments on both sides for proper operation.
High Temp Protective Bellows
This option provides an accordion style protective bellows to protect the main actuator rod from damage due to abrasives or other contaminants in the environment in which the actuator must survive. The high temperature material of this bellows is silicone coated fiberglass. This standard bellows is rated for environmental temperatures of -73 degrees to 288 degrees Celsius. Longer strokes may require the main rod of the actuator to be extended beyond standard length. Consult Exlar applications engineers for details.
L1, L2, L3 = Adjustable External Travel Switches
This option allows up to 3 external switches to be included with the SR Series actuator. These switches provide travel indication to the controller and are adjustable. Purchasing the anti-rotate option with external limit switches is required.
Motor Options
SR Motor options are described with a 3 digit code. The first digit calls out the stack length, the second the rated bus voltage, and the third the number or poles of the motor. Refer to the mechanical/electrical specifications for motor torque and actuator rated force.
All 8 Pole, Class 180 H
118 = 1 stack, 115 Vrms
138 = 1 stack, 230 Vrms
158 = 1 stack, 400 Vrms
168 = 1 stack, 460 Vrms
218 = 2 stack, 115 Vrms
238 = 2 stack, 230 Vrms
258 = 2 stack, 400 Vrms
268 = 2 stack, 460 Vrms
Motor Speed Designators
All Exlar T-LAMTM motors and actuators carry a standard motor speed designator as defined below. This is representative of the standard base speed of the motor, for the selected bus voltage.
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Designator
|
Base Speed
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Actuator/Motor Series
|
|
-50
|
5000 rpm
|
SR21
|
|
-40
|
4000 rpm
|
SR31
|
|
-30
|
3000 rpm
|
SR41
|
|
01-99
|
Special Speed, Consult Exlar
|
If the model number is created and the location for the motor speed designator is left blank, this is the base speed that each motor will be manufactured to. The model number can also be created including this standard speed designator.
Exlar also provides the flexibility to manufacture all of its T-LAM products with special base speeds to match the customer’s exact application requirements. This may be a higher than standard speed motor, or lower base speed than standard which will allow the customer to get the required torque, at a speed optimized to their application, and use the minimum amount of current from their amplifier.
The callout for a special speed is configured in the model number by using a two digit code from 01-99. These numbers represent the number, in hundreds, of RPM that will be the base speed for the particular motor.
For example, an SR-31-03-01-BSA-EM3-138-30 motor that normally has a 3000 rpm standard winding, can be changed to a 3300 rpm winding by changing the -40 to a -33. It can be changed to a 5000 rpm winding by changing the -40 to a -50.
Changing this speed designator will change the ratings of the motor, and these must be obtained from Exlar applications engineers. Also, it is not possible to produce every possible speed from 01-99 for each motor at each voltage, so please contact Exlar applications engineers for confirmation of the speed that is desired for the application.
PB = Protective Bellows
This option provides an accordion sytle protective bellows to protect the main actuator rod from damage due to abrasives or other contaminants in the environment in which the actuator must survive. The standard material of this bellows is neoprene coated nylon. This standard bellows is rated for environmental temperatures of -54 degrees to 121 degrees Celsius. Longer strokes may require the main rod of the actuator to be extended beyond standard length. Consult Exlar applications engineers for details.
PF = Preloaded Follower
This option offers a true zero backlash follower for the SR Series actuator. The dynamic load rating of zero backlash, preloaded screws is 63% of the dynamic load rating of the standard non-preloaded screws. The calculated travel life of a preloaded screw will be 25% of the calculated travel life of the same size and lead of a non-preloaded screw for the same application.
RB = Rear Electric Brake
This option provides a rear internal holding brake for the SR Series actuator. The brake is permanent magnet activated and electrically released. 24 VDC.
Rod End Attachments
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Rear Clevis Pin
-
Spherical Rod Eye
-
Rod Eye
-
Rod Clevis
SR = Splined Main Rod
This option provides a main rod manufactured of ball spline shafting, and the front seal and bushing assembly replaced with a ball spline nut to provide the anti-rotate function without using an external mechanism. Rod diameters are the closest metric equivalents to standard Exlar rod sizes. This option is NOT sealed in any way. This option is not suitable for any environment in which contaminants come in contact with the actuator, and may enter the actuator.
XL = Non-Standard Lubrication
This option provides for indication in the model number that the customer has specified a lubrication other than the standard provided by Exlar.
XT = Special Travel Option Selections
The XT option can be used to specify various special travel options on the SR Series of Linear Actuators. Because this option can be used to specify many things, it is important that an order including the -XT option spell out in detail, the exact options being selected by the including of the -XT in the model number.
It is recommended that prior to ordering an actuator including the -XT specifier that a quote be obtained through Exlar’s special products application engineers for the desired options, and that quote be referenced on, or included with any order placed.
