2 Product Specification
Linear actuators MC250 • MC253 • MC500 • MC503
8 Version 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.
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