11
ANTRIEBSTECHNIK
6
10
11
KEB COMBIVERT F4-C
Name: Basis
19.11.98
6
Section
Page
Date
©
KEB Antriebstechnik, 1997
All Rights reserved
Chapter
Functional Description
Encoder Interface
Param.
Adr.
min
max
default
ENTER
PROG.
R/W
Step
6.10.14
Used Parameters
ru.1
2001h
-
-
-
-32767 U/min 32676 U/min
0,5 U/min
-
-
ru.47
202Fh
-
-
-
-409,5875 Hz 409,5875 Hz
0,0125 Hz
-
-
cn.3
2503h
✔
✔
-
0
2
1
0
-
dr.24
2418h
✔
-
-
0
7
1
0
-
dr.25
2419h
✔
-
-
1 inc/r
10000 inc/r
1 inc/r
2500 inc/r
-
dr.29
241Dh
✔
-
-
0
1
1
0
-
dr.30
241Eh
✔
-
-
1 inc/r
10000 inc/r
1 inc/r
2500 inc/r
-
dr.34
2422h
✔
-
-
0
1
1
0
-
dr.35
2423h
✔
-
-
-20,000
20,000
0,001
1,000
-
dr.36
2424h
✔
-
-
-20,000
20,000
0,001
1,000
-
dr.37
2425h
✔
-
-
0
6
1
0
-
dr.38
2426h
✔
-
-
0
6
1
0
-
dr.44
242Ch
✔
-
-
0
9999 U/min
1 U/min
-
-
cn.3
2503h
✔
-
-
0
2
1
0
-
6.10.13 Frequent
Errors
To quickly achieve positive results when using feedbacks, observe and check the following
check list:
- Enter correct motor and encoder data
- Check gearbox factor if the encoder is not directly mounted on the motor
- Check encoder for firm attachment
- Use tight fitting connection between motor shaft and encoder (rubber or shrink
tubing are unsuited).
- Loose stud screws on the encoder shaft cause slipping through at fast acceleration
- In case of harmonics in the system check the plant for backlash free clutches
- Since the encoder signals are in the kHz range absolutely observe cable
specifications as well as maximum cable length and screens.
- Check, whether the encoder is suitable for the desired speed range (e.g. a pulse
encoder with 1 pulse per rotation will not provide good control behaviour at 20
rpm). Refer to section 6.10.7 for the calculation formula. The controls are adjusted
for inverter : motor 1:1 dimensioning.
- In case of two channel measurements with the oscilloscope always measure against
0V: voltage differential measurements of the encoder signal are to be carried out
individually!
- When carrying out the connection ensure the correct assignment of A /A’ and B/B’
so that actual speed is not returned opposite to the setpoint speed.
Actual speed of encoder channel:
- Adjust cn.3 to „1“ or „2“ (depending on encoder channel)
- Adjust dr.24 to corresponding encoder channel
Operate inverter in open-loop operation:
- Setpoint speed ru.4 and actual speed ru.1 must have the same sign. If this is ensured,
it can be changed to closed-loop operation.
Testing of Encoder Signals:
