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9
ANTRIEBSTECHNIK
6
9
9
KEB COMBIVERT F4-F
Name: Basis
09.08.00
6
Section
Page
Date
©
KEB Antriebstechnik, 1999
All Rights reserved
Chapter
Functional Desription
Encoder Interface
6.9.5
Basic Setting
Prior to start-up the inverter must be adapted to the encoder(s) which is/are used.
Adjustment of encoder line
number
(dr.25, dr.30)
Cable length
To achieve an unobjectionable function following cable lengths should not be exceeded.
Precondition for it is that the supply voltage at the rotary encoder is within the specified
tolerances.
The encoder lines should not be longer than 50 m. If longer cables are needed,
please contact KEB.
Further information can be taken from the documentation of the respective
manufacturer.
With this parameter the encoder line number is adjusted to the connected encoder
within a range of 256…10000.
• dr.25 for encoder interface 1
• dr.30 for encoder interface 2
Encoder track change
(dr.29, dr.34)
If you find that during start-up in controlled operation the actual and setpoint speed
have different signs it can be an indication for a wrong connection of the incremental
encoder. If possible the wiring should be corrected. Should this involve too much
effort then you can achieve a rotation reversal of encoder 1 by means of dr.29. The
effect corresponds to a change of the A and B tracks of the incremental encoder.
With parameter dr.34 it is possible to achieve a track change of encoder 2.
This parameter defines the time over which the speed average is determined. At that
the resolution of the speed detection is defined simultaneously.
dr.40 Sampling
Speed resolution with the use of an
time
incremental encoder with 2500 pulses
0
0,5 ms
12 min
-1
1
1 ms
6 min
-1
2
2 ms
3 min
-1
3
4 ms
1,5 min
-1
(factory setting)
4
8 ms
0,75 min
-1
5
16 ms
0,375 min
-1
Speed sampling time
(dr.40)
When using other line numbers:
Speed resolution =
Specified speed resolution x 2500
Line number
Encoder resolution
(dr.28)
When connecting sine / cosine encoders the accuracy of the position recording is
improved by activating the high-resolution (dr.28 = 1). For incremental encoders with
rectangular signals the adjustment must be dr.28 = 0.