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5
ANTRIEBSTECHNIK
6
10
5
KEB COMBIVERT F4-F
Name: Basis
15.03.99
6
Section
Page
Date
©
KEB Antriebstechnik, 1999
All Rights reserved
Chapter
Functional Description
Synchronous Control
Reference point mode
(Pc.10)
Two different modes of reference point approach are supported in the synchronous mode.
In both modes the reference point approach can be started with Pd.1 or over a digital input.
The difference exists in the behaviour of the drive after reaching the reference point:
Pc.10
Function
0
After reaching the reference point the drive runs to the reference marking of
the encoder and stops then. If the reference marking was not yet approached
(starting reference point approach shortly before reference point switch) then
the drive continues to run to the limit switch, reverses and starts a new
approach of the reference point.
1
- Without function in the synchronous module -
2
Drive stops after reaching the reference point
3
- Without function in the synchronous module -
One limit switch serves at the same time as reference point switch; reference point run with
approach of the reference marking of the encoder.
• Terminal X2.3 = limit switch right (di.11 = 16)
• Terminal X2.4 = limit switch left + reference point switch (di.12 = 21)
•
Reference speed -100 min
-1
with counter-clockwise rotation (Pc.14 = -100)
• Starting of reference point approch with X2.7 (di.5 = 10)
or
by bus / PC with
parameter Pd.1 = 2 (Pc.10 = 0)
If the zero pulse shall not be approached (Pc.10 = 2) then only the reference point switch is
cleared and the drive stops then.
6.10.7 Reference Point
Approach
Examples
Example 1
X2.4
X2.3
v
REF
1
2
+v
REF
-v
REF
t
Pc.14
Pc.14
0,25 x Pc.14
A
B
C
D
t
0
1
X2.4
A:
Starting reference point approach
B:
Brought in position at reference switch
C:
Reference switched cleared
D:
Reference marking of encoder reached
1:
Original positioning
2:
Position after reference point approach
Fig. 6.10.7 Reference point approach example 1