Spirax Sarco AEL7 Series - Commissioning; Commissioning Safety Information; Adjustment of Travel Dependent Switch S3 (8-20 kN actuators only)

IM-P713-01 CTLS Issue 1
45
AEL7 Series Electric actuator
6.1 Commissioning Safety Information
Caution
Before commencement of any commissioning work, please read to Section 1 "Safety
Information" and Section 4.1 "Electrical Connection Safety Considerations".
Warning
Mains connection and commissioning of the AEL7 Series actuator requires specialist
knowledge of electrical circuits and systems, and the inherent dangers. A working knowledge
of linear actuators is also required.
Risk of injury by moving parts. Ensure that that the control system is disabled and the
electrical power supply is isolated to ensure that the valve and actuator do not move without
warning. The incorrect use of power supplies to assist the installation, commissioning and
maintenance of electrically actuated valve assemblies increases the risk of personal injury.
Warning - crush hazard
Do not place hands within the actuator yoke or on the stem when isolation of the electrical
power supply has been removed.
Do not attempt to restrict actuator stroke or movement, or increase seat load through the
placing of objects within the actuator yoke. This practice could also result in the loss of sight.
6.2 Adjustment of Travel Dependent Switch S3
(8-20 kN actuators only)
Caution
Before commencement of any work to inspect, install, commission, remove or modify the
travel dependent switch, please read to Section 1 "Safety Information" and Section 4.1
"Electrical Connection Safety Considerations".
The 8-20 kN AEL7 Series actuators are supplied with three switch cams. One is for the travel dependent
switch (S3 – used to limit the actuator stroke for larger thrust actuators when used on shorter stroke valves).
The remaining two cams are for the auxiliary switched (S4 and S5). Please refer to Fig. 9 for product
orientation.
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Manually drive the actuator to the desired maximum stroke (retracted) position
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Loosen the knurled nut up to the lock nut
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Carefully insert an insulated terminal screwdriver in one of the S3 cam slots and turn the cam slowly
until the point that the switch S3 is just made (confirm with a measurement instrument if necessary)
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Tighten the knurled nut
Note: The lock nut must not be moved. If the cams are tight to move, hold the travel lever
in positon rather than the lock nut.
For situations when the travel dependent switch is not going to be used, ensure that the
setting of this switch does not interfere with setting of the valve, actuator or positioner card.
6. Commissioning