HORA MC250/24 User manual

March 2011 / 111207 / EN
Operating Manual
Linear Actuators
MC250/24 • MC250/230 • MC253/24 • MC253/230
MC500/24 • MC500/230 • MC503/24 • MC503/230

General information
Linear actuators MC250 • MC253 • MC500 • MC503
2Version 2.1 - March 2011 Operating Manual
General information
Amendment
Copyright The copyright for this operating manual as well as all rights in case of patent
awarding or registration of registered design remains with the manufacturer!
Subject to alteration The regulations, directives, standards etc. are compliant with the current state of
information at the time of development and are not subject to modification service.
They must be applied by the operator at his own responsibility in their latest valid
version.
Concerning all data, information, and illustrations in this manual we reserve the
right of technical modifications and improvements. No claims can be considered
for alteration or rework of already delivered lift drives.
Version Date Modifications
1.0 August 2004 Initial preparation
2.0 July 2007 Complete revision and amendment
2.1 March 2011 Revision

Content
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 3
Content
1 Safety ......................................................................... 4
1.1 Proper use ............................................................... 4
1.2 Information for the operator ..................................... 4
1.3 Personnel................................................................. 5
1.4 Prior to starting work................................................ 5
1.5 During operation ...................................................... 5
1.6 Working environment............................................... 5
2 Product Specification ............................................... 6
2.1 Components ............................................................ 6
2.2 Accessories ............................................................. 7
2.3 Operating modes ..................................................... 7
2.3.1 Continuous mode ......................................... 7
2.3.2 Three-point mode ......................................... 8
2.4 Functions ................................................................. 8
2.4.1 Binary signal / Frost protection function ....... 8
2.4.2 Lock detection .............................................. 8
2.4.3 Internal temperature monitoring ................... 8
2.4.4 Open-circuit detection................................... 9
2.4.5 Set time ........................................................ 9
2.4.6 Hysteresis..................................................... 9
2.4.7 Manual mode and feedback signal............... 9
2.4.8 Autotest ...................................................... 10
2.4.9 Autopause .................................................. 10
2.4.10 Potential-free way-switch (optional extra)... 10
2.5 Technical data ....................................................... 10
2.6 Ratingplate............................................................. 11
3 Transport and storage ............................................ 11
4 Assembly ................................................................. 12
4.1 Check the scope of supply..................................... 12
4.2 Prepare for installation........................................... 12
4.3 Mount linear actuator on valve............................... 13
4.4 Fit/remove cover .................................................... 14
4.5 Connect the electrics ............................................. 15
4.5.1 Control-independent switching ................... 17
4.5.2 Remove printed circuit board cover............ 18
4.6 Optional extras installation..................................... 18
4.6.1 Way-switch printed circuit board
installation .................................................. 19
4.6.2 Fit the printed circuit board for mA
output signal. .............................................. 20
5 Commissioning........................................................22
5.1 Operating parameters and coding switch
positions.................................................................22
5.2 Set input signal.......................................................23
5.3 Set actuating time ..................................................23
5.4 Set hysteresis.........................................................24
5.5 Set actuating direction............................................24
5.6 Set Autotest and Autopause ..................................24
5.7 Set limit position.....................................................25
5.8 Set potential-free way-switch .................................25
5.9 Initialise the path-measuring system......................27
5.10 Commissioning.......................................................28
6 Operation..................................................................29
6.1 Switching between Manual and
Automatic modes ...................................................29
6.2 LED display............................................................30
7 Maintenance, Care and Repairs .............................30
8 Spare parts...............................................................30
9 Shutdown and Disposal..........................................31
10 Troubleshooting ......................................................31
10.1 Troubleshooting .....................................................31
10.2 Operating faults checklist.......................................32

1 Safety
Linear actuators MC250 • MC253 • MC500 • MC503
4Version 2.1 - March 2011 Operating Manual
1 Safety
Read these Operating Instructions carefully particularly the following safety
instructions prior to installation and operation.
DANGER
DANGER
Directly threatening hazard leading to death or serious physical injuries.
WARNING
WARNING
Potentially hazardous situation which may lead to death or serious physical
injuries.
CAUTION
CAUTION
Potentially hazardous situation which could lead to minor physical injuries.
Indicates a hazard which may cause material damage.
ATTENTION
ATTENTION
Potentially hazardous situation where the product or an object in its environment
may get damaged.
Hint: Utilisation instructions and other useful information.
1.1 Proper use
Linear actuators MC250/24, MC250/230, MC253/24, MC253/230, MC500/24,
MC500/230, MC503/24, MC503/230 are controlled by three-point control or
constant control. Linear actuators in the series described in these Operating
Instructions are used for valve stroke adjustment.
Concurrence of the above type designation with the linear actuator rating plate
must be checked prior to starting any operations in order to guarantee utilisation
in accordance with specification. The data on the rating plate is decisive for linear
actuator technical data and mains power supply requirements.
Any utilisation for tasks other than the aforementioned usage in accordance with
specification and operating with mains power supply ratios other than those
permitted is not deemed to be utilisation in accordance with specification. The
operator bears sole liability for the risk to persons and machine and other assets
in the event of utilisation not in accordance with specification.
The intended use also includes the compliance with accident preventions, DIN
VDE regulations and safe working practices for all measures described in these
operating instructions in due consideration of prevailing rules.
1.2 Information for the operator
Always keep the Operating Instructions available at the linear actuator
deployment site.
Observe the current health and safety, accident prevention and DIN VDE
standards for installation, operation and maintenance.
Take into consideration any additional regional, local or in-house safety
regulations.

1Safety
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 5
Ensure that every person entrusted with one of the tasks specified in these
Operating Instructions has read and understood these instructions.
1.3 Personnel
Only qualified personnel may work on these linear actuators or in their vicinity.
Qualified persons are those persons entrusted with installation, assembly,
commissioning and operation or maintenance of the linear actuators and
possessing the appropriate qualifications for their activity. The necessary and
prescribed qualifications include:
•Training / instruction or authorization to turn on /off circuits and appliances /
systems according to EN 60204 (DIN VDE 0100 / 0113) and the standards of
safety technology.
•Training or instruction according to the standards of the safety technology
concerning care and use of adequate safety and work protection equipment.
•First Aid training.
Work in a safe manner and refrain from any working practice which endangers the
safety of persons or damages the linear actuator or other assets in any way
whatsoever.
1.4 Prior to starting work
Prior to starting any work, check that the type designations specified here concur
with the data on the linear actuator rating plate.
Linear actuators MC250/24, MC250/230, MC253/24, MC253/230, MC500/24,
MC500/230, MC503/24, MC503/230.
1.5 During operation
Safe operation is only possible if transportation, storage, installation, operation
and maintenance are carried out safely and materially and professionally
correctly.
Transportation,
installation and
assembly
Observe the general set-up and safety regulations for heating, ventilation, air-
conditioning and pipework design. Use tools correctly. Wear the necessary
personal and other safety equipment.
Repairs and
maintenance
Ensure that qualified personnel switch off the linear actuator prior to maintenance
or repair work in accordance with DIN VDE.
1.6 Working environment
Read the data concerning the working environment in the Technical Data.

2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
6Version 2.1 - March 2011 Operating Manual
2 Product Specification
The linear actuator controls a step motor with the aid of a microcontroller. The
rotational motion of the step motor is transformed into a linear motion via a
planetary gearbox and a leadscrew with spindle nut.
2.1 Components
1Actuator casing
2Cross head
3Coupling piece*
4Union nut
5Spindle nut
8Position display *
10 Protective tube
11 Spacer sleeve
13 Bridge
16 Gear casing
33 Sheeting
34 Knob
36 Hand wheel
47 Viewing window
* This component is available as a spare part!
60 Guide bush
101 Engine/ motor
107 Terminal board for 24 V or 230 V
110 Main board
201 Cover for 24 V or 230 V*
230 Cable inlet M20 × 1.5*
231 Cable inlet M16 × 1.5*
312 Safety disk
314 Blank flange*
315 Bolt*
452 Hexagonal nut M12*
480 Type plate
481 Circuit diagram on cover
Diagram 1 Component drawings
107
34
33,
481
110
101
36
10
5
452
312
2
60
11
13
16
1
480
47
230; 231
201
8
4
314
315
3

2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 7
2.2 Accessories
2.3 Operating modes
The linear actuator can be operated in Manual or Automatic mode.
•The lift is adjusted via the handwheel in Manual mode.
•The lift is electrically controlled in Automatic mode.
2.3.1 Continuous mode
In Continuous mode the position of the linear actuator is specified by the system
control. The input signal (Y) from the system control in the linear actuator is
continually compared with the output signal (X) from the linear actuator for this
purpose. The output signal is dependent on the position of the linear actuator
(travel) in this instance.
The linear actuator moves until the input signal and the output signal correspond.
111 Printed circuit board for output signal X=0/4 … 20 mA
Diagram 2 Printed circuit board for mA output signal on the motherboard
106 Way-switch printed circuit board
Diagram 3 Way-switch printed circuit board in cover
0...20 mA
4...20 mA
111
LED1
LED2
LED2
LED1
106

2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
8Version 2.1 - March 2011 Operating Manual
Input signal (Y) The input signal (Y) from the system control specifies the reference position for
the linear actuator. It is an analogue signal on terminal Y.
The following input signals are possible:
•0 … 10 V DC / 2 … 10 V DC
•0…20mA/4…20mA
Output signal (X) The output signal (X) specifies the actual position of the linear actuator. It is an
analogue signal on terminal X.
0% to 100% valve lift is output as:
•0…10VDC
•0 … 20 mA or 4 … 20 mA (Printed circuit board for output signal as optional
extra (111))
2.3.2 Three-point mode
The direction of movement is specified via a control voltage on terminal 2 and
terminal 3 on the motherboard:
•If the control voltage on terminal 2 is on, the spindle nut extends.
•If the control voltage on terminal 3 is on, the spindle nut retracts.
2.4 Functions
2.4.1 Binary signal / Frost protection function
Terminals B1 and B2 on the motherboard are bridged in Normal mode. If the
circuit between B1 and B2 is broken, the linear actuator stores the actual position
and then moves automatically to its limit position.
All other control signals are ignored during this process.
The linear actuator remains in the limit position until the circuit between B1 and
B2 is closed again.
•In Three-point mode the linear actuator then returns automatically to the
stored position.
•In Continuous mode the reference value of the input signal is again
approached.
2.4.2 Lock detection
If the linear actuator becomes mechanically locked, it returns briefly and tries
again to reach the required position. If this does not happen after a total of 7
attempts, the linear actuator is switched off to avoid damage to linear actuator and
actuator.
The lock detection is displayed via the green LED in the(47)viewing window.
Table 7 on page 30
2.4.3 Internal temperature monitoring
The actuator has internal temperature monitoring.
Overheating protection If the temperature in the actuator casing exceeds a limit value, the motor will be
switched off. Once the motor has cooled down, it is automatically switched on
again.

2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 9
Actuator heating If the temperature in the actuator drops below 15 °C, the motor is switched to
heating in the operating pauses. The actuator heating switches off automatically
at a constant temperature of approx. 22 °C. The actuator heating does not affect
the functions of the actuator.
Heating capacity:
•12.5 W at temperatures from approx. 8 °C to approx.15 °C
•18 W at temperatures below 8 °C
The heating prevents the build-up of water condensation in the actuator and at the
same time guarantees the smooth running of the gears even at temperatures up
to approx. - 10°C.
Heating operation and motor switch-off are displayed via the LED in the (47)
viewing window.
Table 8 Red LED display on page 30
2.4.4 Open-circuit detection
Open-circuit detection is only available in Continuous mode with an input signal
2 … 10 V DC and 4 … 20 mA.
If the input signal drops below 1 V or 2 mA in Continuous mode, the linear
actuator moves to the limit position set by coding switch S7.
Open-circuit detection is displayed via the green LED in the (47) viewing window.
Table 7 Green LED display on page 30
2.4.5 Set time
The time the spindle nut takes to travel a defined path, is called actuating time.
The actuating time is indicated in s/mm. The actuating time is set by coding switch
S5.
5.3 Set actuating time on page 23
2.4.6 Hysteresis
The differential of the input signal (Y) required after a reversal of the signal
direction so that the spindle nut is moved, is called hysteresis.
It is used to avoid permanent oscillation of the actuator motor around a specific
lift position in the event of slight input signal changes.
5.4 Set hysteresis on page 24
2.4.7 Manual mode and feedback signal
The lift can be manually changed in Manual mode without power supply.
•The electronic motor and control are switched off in Manual mode so that lift
movements by the control are not possible.
•As soon as the linear actuator is switched to Manual mode, the control
switches a signal to Terminal R, if the power supply is on.
6.1 Switching between Manual and Automatic modes on page 29

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

3 Transport and storage
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 11
2.6 Ratingplate
The rating plate is located on the linear actuator casing.
This includes the type designation and the fabrication number (F.No.) with the
date of manufacture (last four digits).
2.1 Components on page 6
3 Transport and storage
CAUTION
Risk of injury in the event of non-compliance with safety regulations!
•Wear the necessary personal and other safety equipment.
•Avoid knocks, shocks, vibrations and similar to the linear actuator.
•Store the linear actuator (and if necessary the complete actuating unit) in a dry
place.
•Observe the transportation and storage temperature of -20 to +65°C.
Input signal Y/
Input resistor (resistance
of load)
• 0 … 10 V DC / 77 k
• 2 … 10 V DC / 77 k
• 0 … 20 mA / 510 
• 4 … 20 mA / 510 
Output signal X/
Load capacity
• 0 … 10 V DC / resistance of load 1200 , Imax. 8 mA
• 0 … 20 mA / resistance of load 500 -
with printed circuit board for output signal as optional
extra (111)
• 4 … 20 mA / resistance of load 500 -
with printed circuit board for output signal as optional
extra (111)
Feedback signal R/Load
capacity
• 24 V DC / Minimum resistance 480 Imax. 35 mA
Transmission resistance
between B1 and B2
•max.10
Table 2 Technical Data Signals
Diagram 4 Example of a rating plate
MC500/230
F.-Nr.: 07204142/01/0607
AC 50 Hz 230 V
Y=0…10 V DC
X=0…10 V DC
max. 25 VA
IP 54
S3-50% ED
5kN
5s/mm
Stroke 60 mm

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
12 Version 2.1 - March 2011 Operating Manual
4 Assembly
Prior to installation of the linear actuator:
4.1 Check the scope of supply on page 12
4.2 Prepare for installation on page 12
Installation of the linear actuator includes the following tasks:
4.3 Mount linear actuator on valve on page 13
4.4 Fit/remove cover on page 14
4.5 Connect the electrics on page 15
4.1 Check the scope of supply
1Check the packaging for damage.
2Dispose of the packaging in an environmentally friendly manner.
3Check against the delivery note that the delivery is complete.
4Report any missing or damaged products to the manufacturer.
4.2 Prepare for installation
ATTENTION
Damage due to valve not being fitted!
If the linear actuator is operated without valve, then the spindle nut may fall out
due to the missing stop.
•Therefore, only operate the linear actuator with a valve fitted.
1Ensure that there is space of approx.200 mm above the cover at the installation
site.
2Check the working environment prior to fitting the linear actuator and
commissioning:
3Ensure that the valve is fitted correctly. See Valve Installation Instructions for
further information.
4Determine the installation position of the linear actuator. Linear actuators may
not be installed in a suspended position.
Diagram 5 Installation positions for linear actuator and valve
A
B
A-B

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 13
4.3 Mount linear actuator on valve
If the linear actuator und the valve are delivered separately, the linear actuator
must then be mounted on the valve.
Proceed as follows to install the linear actuator:
1Remove the blank (314) flange.
Diagram 6 on page 13
2Remove the bolt (315) from the coupling (3) or force it out.
Assembly of MC250/24, MC250/230,
MC500/24 and MC500/230
Assembly of MC253/24, MC253/230,
MC503/24 and MC503/230
2Cross head
3Coupling piece
5Spindle nut
18 Valve stem
19 Valve neck
36 Hand wheel
308 Retaining washers
314 Blank flange
315 Bolt
428 Screws
451 Hexagonal nut M10
459 Hexagonal nut
Diagram 6 Mount linear actuator on valve
36
5
314
3
315
18
451
428
308
2
19
36
5
314
3
315
18
451
459
2
19

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
14 Version 2.1 - March 2011 Operating Manual
3Rotate the hexagonal nut M10 (451) wrench size 17 onto the valve spindle (18).
4Rotate the coupling (3) onto the valve spindle (18).
5Use the flat hexagonal nut to lock the valve spindle (18) to secure it against
distortion.
6Place the actuator with traverse (2) onto the valve neck (19).
7 For Types MC253, MC503:
Fix the traverse (2) with a hexagonal nut (459) wrench size 50.
8 For Types MC250, MC500:
Fix the traverse (2) of the actuator with screws (428) wrench size 13 and
retaining washers (308) on the valve neck (19).
9Use the handwheel (36) to adjust the spindle nut (5) upwards so that the
bolt(315) can be refitted.
10 Fit the blank (314) flange!
Proceed as follows to dismantle the linear actuator:
1Carry out the installation sequence steps in reverse order.
4.4 Fit/remove cover
The terminals for the electrical connection are located in the cover.
WARNING
Electric shock due to live components!
If the power supply is switched off, there is danger of electric shock due to live
components.
•Prior to starting work ensure that the actuator is disconnected safely from the
mains power supply.
•Secure against unauthorised switching-on.
•Remove the cover only temporarily.
Proceed as follows to remove the cover:
1Unlock the cover (201). Use a screwdriver (34) to turn the rotary knob counter-
clockwise through 90° as far as the stop.
2Insert a screwdriver into a groove in the cover and lift off the (201) cover.
34 Knob 201 Cover
Diagram 7 Remove cover
201
34
7 mm

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 15
ATTENTION
Damage to the equipment due to damaged wiring!
When removing the cover it is possible to tear or damage the wiring in the cover.
•Remove the cover carefully.
3Remove the cover (201) carefully.
4Disconnect the plug connection between motherboard (110) and cover (201).
Proceed as follows to replace the cover:
1Insert the cables previously removed into the plug connector in the motherboard
(110).
Take care not to damage the grooves in the plug connector and bush.
Hint: The cover (201) can be fitted in four different positions offset by 90° respectively.
This enables convenient laying of the connecting cable in the event of different
installations of the linear actuator.
2Put the cover (201) on and press it into place with moderate application of force.
3Check the correct fit of the cover to ensure the tightness of the actuator casing.
4Lock the cover (201). Use a screwdriver (34) to turn the rotary know clockwise
through 90° as far as the stop.
4.5 Connect the electrics
WARNING
Danger of death if carried out by unqualified personnel!
Connection of the electrics by unqualified personnel may cause death, serious
physical injury or considerable material damage as a result.
•Ensure that this work is only carried out by qualified personnel.
1.3 Personnel on page 5
WARNING
Electric shock due to live components!
Once the power supply has been switched on, there is risk of electric shock due
to live components.
•Prior to starting work ensure that the actuator is disconnected safely from the
mains power supply.
•Secure against unauthorised switching-on.
Proceed as follows to prepare for the power connection:
1Ensure that the power supply concurs with the data on the linear actuator rating
plate.
2Design the cable profile in accordance with the actuator power and the
necessary cable length in order to avoid operating faults.
3Lay the mains cables for a power supply of> 48 V separately from the signal and
control cables.
If the cables are laid in a common cable duct, screened control cables must be
used.

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
16 Version 2.1 - March 2011 Operating Manual
4Check the power supply voltage.
If the required tolerance of the power supply voltage cannot be maintained with a
mains transformer, an AC voltage regulator must be used.
2.5 Technical data on page 10.
Proceed as follows to switch the electrics on:
1Remove the (201) cover.
Proceed as follows to remove the cover: on page 14.
2Feed the cable through the screw connector in the cover to the terminal strip.
3Connect the electrics in accordance with the circuit diagram.
Diagram 8 on page 16
Hint: The circuit diagram (481) is located on the printed circuit board cover (33).
ATTENTION
Malfunction due to incorrect zero potential!
If the linear actuator is electrically supplied by signal generators with different zero
potentials, this may cause incorrect dynamic performance.
•Ensure that the zero potentials are correctly used.
Table 3 on page 17
4Tighten the screw connections.
Diagram 8 Wiring diagram

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:
1Connect the 24 V AC power supply via a diode and a three-stage switch to
terminal Y.
2This 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
2Control voltage for downward movement in Three-point mode
3Control voltage for upward movement in Three-point mode
RFeedback 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.
YInput signal for Continuous mode
XOutput 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

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
18 Version 2.1 - March 2011 Operating Manual
4.5.2 Remove printed circuit board cover
The printed circuit board cover must be removed (33) first in order to adjust the
linear actuator via the coding switches.
WARNING
Electric shock due to live components!
If the power supply is switched off, there is danger of electric shock due to live
components.
•Prior to starting work ensure that the actuator is disconnected safely from the
mains power supply.
•Secure against unauthorised switching-on.
1Insert a screwdriver into a groove in the cover (201) and lift the (201) cover out.
2Insert a small screwdriver into the groove provided in the printed circuit board
cover for this purpose(33) and remove it with care.
3Once the printed circuit board cover(33) has been removed from the actuator
casing, (1) coding switches S1 to S10 will be accessible.
4.6 Optional extras installation
Optional extras are only part of the scope of supply of the linear actuator if
expressly ordered! The linear actuators are prepared for retrofitting the following:
•Way-switch printed circuit board (106)
•Printed circuit board for output signal X=0/4 … 20 mA (111)
2.2 Accessories on page 7
Diagram 10 Remove the printed circuit board cover from the actuator casing.
33

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
Operating Manual Version 2.1 - March 2011 19
4.6.1 Way-switch printed circuit board installation
WARNING
Electric shock due to live components!
If the power supply is switched off, there is danger of electric shock due to live
components.
•Prior to starting work ensure that the actuator is disconnected safely from the
mains power supply.
•Secure against unauthorised switching-on.
1Open the linear actuator (201) cover.
4.4 Fit/remove cover on page 14
2Press the way-switch printed circuit board (106) onto the terminal board (27)
using the (107) three spacers.
3Place the plug connector bush (115) for the way-switch printed circuit board
(106) on the pin strip (123) on the (110) motherboard. Pay attention to the
grooves in the pin strip and plug connector bush.
27 Spacers
106 Way-switch printed circuit board
107 Terminal board for 24 V or 230 V
115 Plug connector bush
110 Main board
201 Cover for 24 V or 230 V*
Diagram 11 Installation of the way-switch printed circuit board in the cover
201
27
106
115
110
107

4 Assembly
Linear actuators MC250 • MC253 • MC500 • MC503
20 Version 2.1 - March 2011 Operating Manual
4Adjust the way-switch.
5.8 Set potential-free way-switch on page 25
4.6.2 Fit the printed circuit board for mA output signal.
WARNING
Electric shock due to live components!
If the power supply is switched off, there is danger of electric shock due to live
components.
•Prior to starting work ensure that the actuator is disconnected safely from the
mains power supply.
•Secure against unauthorised switching-on.
1Open the cover (201) and remove the printed circuit board cover(481).
4.4 Fit/remove cover on page 14
4.5.2 Remove printed circuit board cover on page 18
2Remove the jumper (JP1) from the motherboard (110).
3Put the jumper (JP1) onto the plug-in bridge (113) for the printed circuit board for
mA output signal.
4Plug the printed circuit board for mA output signal (111) together with its pin strip
into the plug-in bridge (113) on the motherboard (110).
5Lock the spacers (27) into the holes in the motherboard.
123 Pin strip
Diagram 12 Pin strip for way-switch printed circuit board on the motherboard
123