KEB COMBIVERT F5 Reference Manual page 69

Hiperface - Encoder Connections
Technical Data
• Input resistance:
• Process data channel:
• Parameter channel:
• Maximum input frequency:
• Encoder line number:
• Maximum cable length:
Cable length based on cable resistance
The maximum cable length is calculated as follows:
Length =
where
The following Hiperface®-encoders have been tested for use:
• Stegmann SRS 50/60 Singleturn; SCS 60/70 Singleturn
• Stegmann SRM 50/60 Multiturn; SCM 60/70 Multiturn
However, this does not restrict the use of rotary encoder with the same
specifications as other manufacturers.
Recognition of encoder loss or exchange
The recognition of encoder loss or exchange is a software function and
is dependent on the encoder type. If the drive senses that the serial
communication to the encoder has stopped, it will trigger the 'Error Encoder
Interface' fault.

If the encoder is replaced or disconnected, the drive will trigger an
error or warning that the encoder was changed. The drive will display
the error message 'Error Encoder Interface'.
If the encoder was exchanged, the drive will auto reset the 'Error
Encoder Interface' fault. The user will need to learn the new encoder
position before the operation can continue. See section 5.10.
If there is an encoder-triggered fault or problems with the encoder
cables, the 'Error Encoder Interface' fault will not clear and the
problems must be diagnosed through parameter LE12. To clear the
'Error Encoder Interface' fault, it is necessary to go to parameter LE01,
press "Enter," and then press "Enter" to confirm.
120 Ohm
1Vpp
EIA RS485 half duplex
200 kHz
1024 inc
<100 m
V - Vmin 7.5V - 7.0
=
0.2A * 0.07 Ω/m
Imax * R
Imax = supply current of encoder [amps]
V = voltage supply of the drive = 7.5V
Vmin = minimum supply voltage of the encoder
R = cable resistance (0.07 Ω/m) for KEB cables
(based on signal levels, otherwise see below)
= 35.7 m
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