Posi- and synchronous operating
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.12 - 9
7
7.12.2.4 Approach to reference point / no driving free
Apart from the two modes "stop at null signal" or "stop after driving free" of the reference switch, there is a
third reference point drive mode:
PS.14: Mode of position reference
Bit Meaning Value Explanation
9 No driving free
0: off
The reference point switch is driven free during the approach to refe-
rence point
512: on
As soon as the reference point switch has been hit, the drive stops on
the switch. It does not matter whether the switch has been hit going in
the preferred direction. This setting may not be combined with "stop at
null signal".
7.12.2.5 Approach to reference point / limit switch
When the drive reaches the hardware limit switch for the direction of rotation, it automatically reverses and
begins searching
the reference point in the other direction of rotation.
If no reference point switch is found, the drive continuously shuttles between the two hardware limit switches.
Note: During the approach to reference point, the limit switch function works differently than in usual operation.
If in Pn.07 "proh. rot. stopping mode" value: "6: function switched off" is programmed, the drive reverses with
the dened acceleration and deceleration times of parameter PS.20 "reference acc/dec. time".
For all other value of Pn.07, the setpoint speed without ramp is set to zero. The drive stops and then accele-
rates in the other direction of rotation with the ramp from PS.20. No normal quick stop is executed, the quick
stop parameters (Pn.60 / Pn.61 / Pn.67) have no function.
1000 2000 3000 4000 5000 6000 7000 80000
Reference point
switch
Limit switch left Limit switch
right
1
2
3/4
6/7
5 2
point search
completed
Start
PS.21: Approach to reference
point Speed = positive
Reverse after reaching the
right limit switch
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