HORA MC55/24 - Setting the Limit Position; Setting a Potential-Free Path Switch

5 Commissioning
Linear actuators MC160 • MC161 • MC163
Operating Manual Version 2.1 - March 2011 27
5.7 Setting the limit position
Use encoding switch S6 to select the limit position for the linear actuator:
• S6 ON: Limit position with extended spindle nut
• S6 OFF: Limit position with retracted spindle nut
The limit position is approached in the following situations:
• Due to wire break detection by the Y signal (2 … 10 V DC or 4 … 20 mA
only),
• Due to a binary signal (When electric circuit between terminal B1 and B2 is
interrupted),
• During auto test
• After a cut in supply voltage (manual adjustment)
5.8 Setting a potential-free path switch
Trim-pots P1/P2 is used to set the path switches independently. Try out the
sequence of operations for each position switch once.
 How to set a path switch
1 Ensure that the linear actuator has been commissioned and initialised.
 5.10 Commissioning on page 30
 5.9 Initialising the path measuring system on page 29
ATTENTION
Malfunction caused by imprecisely set path switches!
If you have set the actuator to manual mode (without supply voltage) it is only
possible to set the path switch approximately (central setting is the equivalent of
a switch point of c. 50% lift).
• To set the path switch accurately, set the actuator to automatic mode.
2 Move the actuator to the position where the switch event is to be triggered.
Follow the sequence of operations below with the supply voltage turned on.
WARNING
Risk of injury from electric shock by live parts!
When the supply voltage is turned on there is a risk of electric shock from live
parts.
• Take care not to touch any live parts.
• Take care to apply the tool in a way that does not cause short-circuit.
3 Open the cover (201).
 4.4 Assembling/disassembling the cover on page 16
Inside the cover is the path switch PCB (111).
4 Use a screwdriver to adjust the trim-pot until the path switch switches. The
related LED will either light up or switch off.
Potentiometer P1 (105 P1) is used to set path switch 1.
LED 1 shows the switching status.
Potentiometer P2 (105 P2) is used to set path switch 2.
LED 2 shows the switching status.