2 Product Specification
Linear actuators MC55
Operating Manual Version 3.3 - November 2014 7
2.2 Operating modes
The linear actuator can be operated manually or automatically.
• In manual mode stroke is adjusted via the hand wheel.
• In automatic mode stroke is controlled electrically.
2.2.1 Continuous mode MC55Y
In continuous mode the system control presets the position of the linear actuator
whilst inside the linear actuator the input signal (Y) of the system control is
continuously compared with the output signal (X) of the linear actuator. In doing
so the output signal depends on the position of the linear actuator (travel).
The linear actuator keeps moving until the input signal and the output signal
match.
Input signal (Y) The input signal (Y) of the system control specifies the desired position for the
linear actuator. It is applied in the form of an analogue signal to terminal Y.
Possible input signals:
• 0…10VDC / 2…10VDC
• 0…20mA / 4…20mA
Output signal (X) The output signal (X) determines the actual position of the linear actuator. It is
applied to terminal X in the form of an analogue signal.
0% to 100% valve lift is put out as:
• 0 … 10 V DC
2.2.2 Three-point mode MC55/24, MC55/230
The direction of rotation is set via the control voltage at terminal 2 and terminal 3
on the main PCB:
• When the control voltage is applied to terminal 2, the spindle nut will be
extended.
• When the control voltage is applied to terminal 3, the spindle nut will be
retracted.
Output signal (X) The output signal (X) determines the actual position of the linear actuator. It is
applied to terminal X in the form of an analogue signal.
0% to 100% valve lift is put out as:
• 0 … 10 V DC
2.3 Functions
2.3.1 Binary signal / frost protection function MC55Y
The terminals B1 and B2 on the main PCB are bridged during normal operation.
If the electric circuit between B1 and B2 is interrupted, the linear actuator will store
the current position and afterwards move automatically to its limit position.
All other control signals will be ignored during this process.
The linear actuator will remain in limit position until the electric circuit between B1
and B2 has closed.
As soon as the electric circuit between B1 and B2 is closed, the desired value of
the input signal will be started.
5.5 Setting the limit position for MC55Y on page 21
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