Bosch Rexroth IndraDrive MPH-02 Functional Description page 185

MPH-02, MPB-02, MPD-02
Setting the Position Difference
Monitor
Configuring the Spindle Encoder
Monitor
Diagnostic Messages
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Motor, Mechanical Axis System, Measuring Systems
If the actual position value difference of motor encoder and external
encoder is to be monitored you first have to determine a useful value for
the monitoring window, according to the following procedure:
7. Accelerate the axis to maximum velocity with maximum acceleration,
then decelerate it with maximum deceleration. If possible, let the
maximum stationary machining load operate on the mechanical axis
system.
8. Determine the occurred maximum value of the actual position value
difference by means of the display parameter P-0-0391, Actual
position value difference encoder1 - encoder2.
9. Multiply this value with a safety factor (recommended: 2-fold value)
and enter it in the S-0-0391, Monitoring window feedback 2
parameter. The unit is that of the actual position value.
If this monitoring function is not desired you have to enter the value "0".
When using an optional encoder at a spindle you should first determine,
during the initial commissioning procedure, whether the maximum input
frequency of the respective encoder input is exceeded at maximum
speed. To do this, accelerate the spindle to maximum speed.
To prevent the drive from switching off, while in operation, with the
• F2046 Max. signal frequency of encoder 2 exceeded
error message, the spindle encoder monitor should be deactivated.
Therefor enter the respective value in the parameter
• P-0-0185, Control word of encoder 2 (optional encoder)
If the position deviation of a motor encoder or external encoder with
absolute position data reference exceeds the value in P-0-0095 or
P-0-0096 between the points of time the control voltage is switched off
and on again, the drive generates the error message
• F2074 Actual pos. value 1 outside absolute encoder window
- or -
• F2075 Actual pos. value 2 outside absolute encoder window
Note: The value in P-0-0095 or P-0-0096 has to be unequal zero;
value "0" deactivates the monitor!
When the actual position value difference of motor encoder and external
encoder (P-0-0391) exceeds the value of S-0-0391, the drive generates
the error message
• F2036 Excessive position feedback difference.
If, when switching the drive on, the loss of the position data reference of
absolute encoders (motor encoder or optional encoder) is detected due to
changes in the mechanical parameters, for example, the drive signals
• F2174 Loss of motor encoder reference
- or -
• F2175 Loss of optional encoder reference
When the encoder signal frequency of the external encoder exceeds the
maximum value stored in the firmware (see above) the drive generates
the error message
• F2046 Max. signal frequency of encoder 2 exceeded.
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