Power Jacks EMA Actuators - Manual (Page 9)

EMA Linear Actuator
Tel: +44 (0) 1358 285100 email: [email protected]
web: www.powerjacks.com
9
5. Adjusting the limit switches
Electrical connections may only be performed by licensed electricians.
Standard mechanical limit switches are used to cut off the electrical drive before the final
position is reached. The limit switch is triggered by a cam on the lifting nut assembly.
The positions of these limit switches are fixed and are not adjustable. The position is
determined by the length of stroke specified by order and cannot be changed at a later
date. The mounting of a position-measuring system is possible as an option.
Suitably rated mechanical safety limit switches must be used if the non-
disconnection of the electrical drive constitutes a potential danger to
people.
Adjusting the best possible sensing distance:
1.
Position the cam on the lifting nut assembly to cover the opening of the switch.
2. Screw the switch into the housing until the unit switches over.
3. Lock the switch in place with the lock nut.
4. Check the correct function of the switches by moving the lifting-nut assembly
manually.
5. If the switch works correctly then repeat the procedure for the next switch.
Otherwise repeat procedure for this switch.
6. Once all the limit switches are set ensure that the cam on the lifting nut is resting
in a position in between both end of travel limit switches.
The drive must not be put into service before all limit switches have been
mounted and correctly adjusted.