Thomson
Thomson Electrak
®
LL Actuator - Installation Manual - 2020-11
13
4.6.3 Onboard control functions (control type LEX)
Utilizing the internal control system the actuator will:
• Stop the actuator immeditately at each end of mechanical travel and throughout the stroke anytime
current exceeds a factory preset value for the rated load (over load condition). This value is adjusted
during operation automatically to provide consistent force. Resetting the actuator requires motion in
opposite direction to continue normal operation.
• Stop the actuator when 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 normal operation can be continued.
Always turn power off to the actuator before working on it to eleminate the risk of the actuator
making unplanned moves after it has carried out the automatic reset.
Power the actuator by connecting lead 2 to + Vdc and lead 1 to - Vdc in the power cable.
If using a brake resistor it should be connetc between leads 2 and 3 in the power cable. Make sure to use
the correct type of resistor (section 4.5.6).
To extend the actuator apply voltage between lead 6 and 8 in the signal cable. To retract the actuator
apply voltage between lead 7 and 8 in the signal cable.
The actuators will stop automatically when reaching the mechanical end of stroke in any directions and
motion will only be possible in the opposite direction.
External limit switches can be connected to leads 3 and 5 (stop extend) and 4 and 5 (stop retract) in the
signal cable in order to stop the motion in either direction before reaching the mechanical ends of stroke.
When affected they will stop the actuator and motion will only be possible in the opposite direction.
Control Option Specifications
Supply voltage
[Vdc]
16.8 - 32
Max. actuator current draw
[A]
see product label
Input logical high level
[Vdc]
5 - 32
Input current @ 24 Vdc
[mA]
2
F Fuse
R Brake resistor (section 4.5.6)
S1 Switch retract
S2 Switch extend
S3 Limit switch stop extend
S4 Limit switch stop retract
not used
input stop extend
input stop retract
+
–
retract
extend
