HORA MC250/230, Operating Manual, Page: 10 / 32

2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
10 Version 2.1 - March 2011 Operating Manual
2.4.8 Autotest
If a valve is not actuated over a long period, the valve cone may seize. The
Autotest function prevents this. If the Autotest function of the linear actuator is
switched on, the linear actuator moves after approx.10 days without actuation
automatically in rapid traverse to the limit position set by coding switch S7 and
returns to the starting position.
 5.6 Set Autotest and Autopause on page 24
2.4.9 Autopause
The actuator uses this function to count the actuator commands which mean a
change in direction. In the event of more than 20 different directional actuator
commends per minute, a compulsory pause of 3 s is imposed.

5.6 Set Autotest and Autopause on page 24
2.4.10 Potential-free way-switch (optional extra)
The optional way-switch printed circuit board (106) can be used to set two lift
positions at which a potential-free electrical contact is opened or closed.

5.8 Set potential-free way-switch on page 25
2.5 Technical data
Type MC250/24, MC253/24,
MC500/24, MC503/24 MC250/230, MC253/230,
MC500/230, MC503/230
Supply voltage 24 V AC ± 10%
24 V DC ± 10% 115 V AC ± 10%
230 V AC + 6% -10%
Power consumption max. 18 VA max. 25 VA
Weight MCxx0 = 7 kg
MCxx3 = 7,4 kg MCxx0 = 8,2 kg
MCxx3 = 8,6 kg
Dimensions See Technical Datasheets
Stroke max. 2.36 in max. 2.36 in
Frequency 50/60 Hz ± 5% 50/60 Hz ± 5%
Ambient temperature -10 to +140.00°F -10 to +140.00°F
Enclosure protection IP 54 IP 54
Operating mode S3-50% ED S3-50% ED
Set time 2,5 bzw. 5 s/mm 2,5 bzw. 5 s/mm
Actuating power MC25x = 2,5 kN
MC50x = 5 kN
The specified actuating
power is only achieved in
operation at 24 V DC with
rectified AC voltage. MC25x = 2,5 kN
MC50x = 5 kN
Table 1 Technical data