Page 7.12 - 8 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Posi- and synchronous operating
7.12.2.2 Approach to reference point / stopping point
PS.14 determines on which side of the reference point switch the drive is positioned after the approach to re-
ference point. Even if, after the free driving of the reference switch, positioning is to occur based on the zero
signal, "stopping point " determines if the rst null signal is to be driven on at the right or left of the reference
switch.
The adjustment is only considered if the reference point switch serves not simultaneously as limit switch.
PS.14: Mode of position reference
Bit Meaning Value Explanation
3
Stopping
point
0: right Stop on the right side of the reference point switch
8: left Stop on the left side of the reference point switch
7.12.2.3 Approach to reference point / stop at zero signal
An approach to reference point that depends only on the initiator signal of the reference point switch is insuf-
ciently precise for many applications. Therefore, the possibility exists to couple the reference point with the
marker pulse of the encoder.
To that end, positioning after the free driving of the reference switch is done on the marker pulse of the encoder
and the current actual position=marker pulse is then overwritten with the reference point value.
With "stop at null signal= 4: yes" this function is activated.
Additionally, two monitoring functions can be switched in with bit 4 "error if no zero signal" and bit 8 "Verify zero
signal". These are only active if "stop at null signal= yes" is programmed.
PS.14: Mode of position reference
Bit Meaning Value Explanation
2
Stop at zero
signal
0: no The drive stops directly after free driving of the reference point switch.
4: yes
The drive positions on the null signal of the encoder after free driving of
the reference point switch at the free drive-speed. If during the drive to the
reference switch no null signal was received, the behaviour of the drive is
determined by bit 4 "error if no zero signal".
4
Error, if no zero
signal
0: off
If, during the reference point search, no null signal is recognised, the drive
rotates maximally another two revolutions at the free drive-speed to locate
the null signal. If the null signal is found, the drive reverses and drives
back to the reference point switch. Positioning on the null signal is execut-
ed after that.
If no null signal is recognised during the null signal search, the inverter
reports "error! encoder 1" or "Error! Encoder 2" (E.EnC1 respectively
E.EnC2)
16: on
If no zero signal is recognized during searching for the reference point
switch (i.e. if the reference switch is reached before the encoder sends
the rst marker pulse), the inverter immediately indicates „Error! encoder
1" or "Error! encoder 2“ (E.EnC1 or E.EnC2).
8
Examine the
zero signal
0: off no examination of the position of the null signal
256: on
The distance from switch to null signal is examined after driving free of
the reference point switch. If the zero signal does not lie within a range
of ¼ to ¾ revolution, „Error! encoder 1" or "Error! encoder 2“ (E.EnC) is
released.
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