halstrup-walcher PS*3**C series, Инструкция по эксплуатации

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Instruction Manual PSx3xxC
26
Referencing value (SDO #2004):
The referencing process affects all transferred values, i.e., the target value, actual
value, upper mapping end and upper and lower limit.
There are two ways of setting the referencing value:
1) Directly, by writing the referencing value to SDO #2004.
2) Indirectly, by writing an actual value to SDO #2003. This makes it possible to
assign any “true” actual value to the current, physical actual value. The resulting
difference is then the referencing value. This value will immediately be included in
calculations for each transferred value and can also be read via SDO #2004.
When changing the referencing value, automatically the target value, the actual value,
the upper mapping end and the upper and lower limit are re-calculated.
The removal of the motor power supply has no affect on the internal
measuring system.
d) Using actual value assessment factors to set the spindle pitch
SDO #2010 (numerator factor) and #2011 (denominator factor) can be used to
represent any desired spindle pitch.
Both factors are set to a value of 400 by default, resulting in a resolution of 0.01 mm
at a spindle pitch of 4 mm.
The denominator factor serves as a simple means of setting the spindle pitch and
resolution.
The numerator factor is primarily used for setting "unlevel" resolutions.
Examples:
Spindle pitch Resolution Numerator
factor
Denominator
factor
4 mm 1/100 mm 400 400
1 mm 1/100 mm 400 100
2 mm 1/10 mm 400 20
Numerator and denominator factors may take on values between 1 and 10,000.
e) Drag error
During a positioning run, the device compares the computed target position with the
current actual value. If the
difference is larger than the ‘drag error’ value (SDO
#2005), the device sets the corresponding bit in the status word. This situation is
especially likely to occur if external factors (required torque, voltage to motor too low)
prevent the device from achieving the target rpm.
f) Abort run when the master fails
If the connection to the master is interrupted during a positioning run, the master
cannot abort an actual run. There are two ways of generating an automatic run abort
in a case like this: node guarding und heartbeat consumer.