7.12.2.9 Approach to reference point with subsequent drive to zero signal
In order that approach to reference point is more precise, positioning to the zero position of the encoder can be
done after driving free of the reference switch. That this always happens to the same position, it is necessary
to adjust the zero position of the encoder (zero signal) mechanically in such a way that it occurs a half motor
revolution after reference switch. The distance from reference switch to zero position is displayed in ru.69.
Adjustment by software is signicant more comfortable compared to the mechanical adjustment and is done via
parameter PS.60. Parameter PS.60 „zero puls offset“ species the position offset of the zero signal:
new zero signal position = zero signal position of encoder + PS.60
reasonable value range of PS.60 : - increments per revolution / 2……. + increments per revolution /2
PS.14; calculate Offset PS.60
Bit Meaning Value Explanation
12 Calculate Offset
0: off At the approach to reference point the offset in PS.60 is calculated
by way that the drive rotates half turn to the new zero signal positi-
on.
4096: on
PS.60 = +/- encoder increments per revolution/2 + position value – zero signal position of the encoder
+ : drive in positive direction to the zero signal
- : drive in negative direction to the zero signal
PS.14 bit12 must be deactivated after the calculation. The position of the reference switch to the zero signal
can be monitored with parameter PS.14 Bit8 in a range 1/4… 2/3 revolution (ru.59).
7.12.2.10 Approach to reference point with overdriving of the reference limit switch
The reference limit switch is overdriven at rst with setting PS.14 = Bit13. Driving free occurs when the refe-
rence limit switch with constant direction of rotation is no longer active.
If the reference limit switch is already active at the start of the approach to reference point, it is driven free at
rst against to the preferred direction. Subsequently the drive reverses and drives to the reference limit switch
again.
PS.14: Mode of position reference
Bit Meaning Value Explanation
13
Delete when
overdriving
0: off
The reference switch is overdriven when the function is switched
on. Driving free occurs when the reference limit switch with constant
direction of rotation is no longer active.
Simultaneously a special application was given. If the reference
switch is already active at the start of the approach to reference
point, it is driven free at rst against to the preferred direction. Sub-
sequently the drive reverses and drives to the reference limit switch
again. Thereby a gearless is compensated.
8192: on
Posi- and synchronous operating
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.12 - 13
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