HORA MC250/230, Operating Manual, Page: 17 / 32

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual
Version 2.1 - March 2011 17
4.5.1 Control-independent switching
If operating with 24 V power supply and 0 … 10 V DC / 2 … 10 V DC input
signal, the actuator can be switched to control-independent using the three-stage
switch in the control cabinet.
 Proceed as follows to switch the actuator to control-independent:
1 Connect the 24 V AC power supply via a diode and a three-stage switch to
terminal Y.
2 This switch can be used to move the linear actuator into the following positions:
• Control mode through input signal Y (Normal mode)
• 10 V-Position
• 0 V-Position, at 2 … 10 V DC the linear actuator can be moved to the position
selected by coding switch S7.
 5.1 Operating parameters and coding switch positions on page 22
5.7 Set limit position on page 25
Terminal Description
UB, N1 Supply voltage
2 Control voltage for downward movement in Three-point mode
3 Control voltage for upward movement in Three-point mode
R Feedback signal in "Manual mode"
• R= 24 V DC max. 35 mA
B1, B2 Binary input / Frost protection function
N2 Zero potential for signals X, Y and R
• If the zero potentials for signals X, Y and R are identical to the
zero potential for the power supply, terminals N1 and N2 can be
bridged.
• If the actuator is operated in Continuous mode at 230 V, N2
must be closed.
• If the actuator is operated in Three-point mode at 230 V, N2
must be closed, if X and R also need to be used.
Y Input signal for Continuous mode
X Output signal for Continuous mode
20, 21, 22 Terminals for way-switch unit WE1
23, 24, 25 Terminals for way-switch unit WE2
Table 3 Circuit diagram legend
Diagram 9 Control-independent switching
e.g.: 1N4001;
1N4148
10 V Pos.
0 V Pos.
control operation