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8-76
Drive Functions
Position-Controlled Operating
Non-Position-Controlled
Operating Modes
Monitoring the Slip
After the measuring wheel mode has been deactivated, the position data
reference to the axis, if necessary, has to be established again for relative
and absolute encoders.
When activating and completing the measuring wheel mode in position-
Modes
controlled operating modes, the actual position value of the motor
encoder is included in the actual position value of the measuring wheel
encoder (S-0-0051, Position feedback 1 value -> S-0-0053, Position
feedback 2 value).
When switching to a non-position-controlled operating mode while the
measuring wheel mode has been activated, the actual position value of
the measuring wheel encoder is taken to the actual position value of the
motor encoder (S-0-0053, Position feedback 2 value -> S-0-0051,
Position feedback 1 value).
In non-position-controlled operating modes control, as a basic principle,
takes place with regard to the motor encoder. If first the measuring wheel
mode is activated and only then the drive is switched to a position-
controlled operating mode, the actual position value of the motor encoder
is taken to the actual position value of the measuring wheel encoder
(S-0-0051, Position feedback 1 value -> S-0-0053, Position feedback
2 value).
In non-position-controlled operating modes it is possible, with active
measuring wheel mode, to lift the feed rolls off the material (discharge the
feed rolls), for example.
Due to the measuring wheel mode, slip that can occur between material
and drive motor is compensated via the position control. But slip also
implies wear in the mechanical drive system and at the material. The
controller supports reducing wear by allowing the monitoring of the
occurring slip with regard to a maximum allowed value to be set.
The current actual slip value is displayed in P-0-0242, Current actual slip
value in %. It is referring to
• one measuring wheel revolution, if "feed constant 2" is active in
parameter P-0-0185 (typical case: measuring wheel is measuring
linear infeed)
- or -
• one revolution of the external encoder, if "feed constant 2" is not active
in parameter P-0-0185 (encoder is measuring rotary infeed).
If the calculated slip exceeds the value in parameter P-0-0244,
Monitoring window of slip in % (value unequal "0"), the slip monitoring
function triggers with the error message F2036 Excessive position
feedback difference and the drive reacts with the error reaction that has
been set.
To determine the monitoring window, the maximum occurring slip, e.g.
during a machining cycle, is stored in parameter P-0-0243, Maximum
occurred actual slip value in %.
Note:
The slip monitor is deactivated with the value "0" in P-0-0244!
MPH-02, MPB-02, MPD-02
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
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