Mannesmann ecodrive03, Troubleshooting Manual

Page: 47 / 128

ECODRIVE03 SMT-02VRS Description of diagnostic letters F... and E... 3-21
DOK-ECODR3-SMT-02VRS**-WA01-EN-P
F822 Encoder 1 failure: signal amplitude wrong
The analog signals of a motor measurement system are used for high
resolution analysis of that measurement system. These are monitored
according to two criteria:
1. The pointer length, which is calculated from the amplified sine
and cosine signals, must be at least 1 V.
2. The maximum pointer length resulting from the sine and cosine
signals must not exceed 11.8 V.
2 2
cos sin length pointer
+ =
Fig. 3-5: Pointer length
Permissible signal amplitudes for sine and cosine signals
cosine signal amplitude
15
10
0
-5
-10
5
-15
-15 -10 -5 0 5 10 15
sine signal amplitude
Dg5004a1.fh7
nominal pointer length (9,2V)
minimum pointer length > 1,0V
maximum pointer length > 11,8V
=non-permissible range
Fig. 3-6: Correct signal amplitude
Example:
Ucos = -6,5V
Usin = 6,5V
( )
V 9.2 6.5V 6.5V length pointer
2
2
≈ + − =