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SSi - Encoder Connections
Technical Data
• Input resistance: 120 Ohm
• Process data channel: 1Vpp
• Parameter channel: EIA RS485 half duplex
• Clock signal output: EIA RS485
• Maximum input frequency: 200 kHz
• Encoder line number: 1...2048 inc
• Maximum cable length: 100 m (based on signal levels, otherwise see below)
Cable length based on cable resistance
The maximum cable length is calculated as follows:
Length =
V - Vmin
=
5.25V - 4.75V
= 83.3 m
Imax * R 0.2A * 0.03 W/m
where
Imax = supply current of encoder [amps]
V = voltage supply of the drive = 5.25V
Vmin = minimum supply voltage of the encoder
R = cable resistance (0.07 Ω/m) for Standard KEB cables
(0.03 Ω/m) for type "L" KEB cables
The following SSi encoders have been tested for use:
• Hengstler AD-36
However, this does not restrict the use of rotary encoders with the same
specications as other manufacturers.
The inputs for A and B tracks are designed for sinusoidal waveforms,
as shown in Section 3.3. TTL waveforms are possible with adapter
ADF5080-V009.
The recognition of encoder loss or exchange is a software function
and dependent on the encoder type. If the drive senses that the serial
communication to the encoder has stopped, it will trigger the error
E.ENCC.
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 Encoder Interface’ fault. 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
cable, 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" again to conrm.
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