Instruction Manual PSx3xxPN-STO
44
4) Setting upper mapping end:
The parameter defines the location of the maximum possible positioning
range, taking into account the scaling values and the referencing value.
5) Setting upper and lower limits:
If necessary, the maximum possible positioning range can be restricted to
prevent incorrect target positions that lead to a collision.
4.7 Using position scaling factors to set the spindle pitch
Par. 38 (numerator factor) and Par. 39 (denominator factor) can be used to represent
any desired spindle pitch:
number of steps per revolution = 400 *
𝑑𝑒𝑛𝑜𝑚. 𝑓𝑎𝑐𝑡𝑜𝑟
𝑛𝑢𝑚𝑒𝑟𝑎𝑡𝑜𝑟 𝑓𝑎𝑐𝑡𝑜𝑟
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.
4.8 Drag error monitoring
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 (Par. 46),
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.
By setting Par. 46 to 0 the drag error monitoring can be disabled.
