3 Product Description
C-863.12 Mercury Controller
MS249E
Version: 1.2.1
11
3.5
Functional Principles
3.5.1
Block Diagram
The C-863.12 controls the motion of the logical axis of a positioner. The following block diagram
shows how the C-863.12 generates the output signal for the axis connected:
Figure 3: C-863.12: Control value generation
The C-863.12 supports both positioners with PWM amplifier and positioners without PWM
amplifier (p. 43). The positioner must be equipped with an encoder with A/B quadrature signal
transmission for feedback of the current position.
3.5.2
Motor Control
The maximum output voltage of the C-863.12 is only as high as its supply voltage. To avoid
damaging the motor by excessive operating voltage, the C-863.12 scales its output voltage to
the motor connected.
Details on scaling:
▪
The C-863.12 compares its current supply voltage (maximum 48 V) to the value of
parameter 0x7C (
Maximum Motor Output (V)
), which specifies the maximum
permissible operating voltage of the motor (maximum of 48 V depending on the motor
type; see the documentation for the positioner).
▪
Depending on the result of the comparison, the C-863.12 scales the control value for
the PWM converter (see block diagram (p. 11)) and therefore the output voltage as
well.
Example:
The C-863.12 is operated with a 24 V power adapter. The motor of the positioner connected is
designed for a maximum operating voltage of 12 V, which means that parameter 0x7C has a