KEB COMBIVERT F4-C - Frequent Errors; Used Parameters

11
ANTRIEBSTECHNIK
61011
KEB COMBIVERT F4-C
Name: Basis
19.11.98
6
Section
Page
Date
© KEB Antriebstechnik, 1997
All Rights reserved
Chapter
Functional DescriptionEncoder 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: