Emerson Unidrive M702 - Ratio; Software Mode - Absolute SSI Data

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Unidrive M702 User Guide 117
Issue Number: 3
Ratio
In ratio mode the resolution of the input source is based on a 16 bit position feedback device (i.e. equivalent to an AB quadrature encoder with a
resolution of 16384 lines per revolution). The output resolution of the encoder simulation output is defined by the ratio of Encoder Simulation
Numerator (03.093) and Encoder Simulation Denominator (03.094).
Software mode - Absolute SSI data
In software mode the encoder simulation output is derived via software from the selected source with a minimum delay of 250 μs which may be
extended with Encoder Simulation Sample Period (03.087). In SSI output mode drive will simulate an SSI encoder, where the number of bits and the
format of the position message can be adjusted.
AB quadrature output signals, software mode setup – Ratio
Frequency and Direction or Forward and Reverse output signals, software mode setup
Encoder Simulation Source (03.085)
Set to the parameter number of the position source
Pr 03.029 to use the P1 position interface on the drive as the source.
Pr 03.129 to use the P2 position interface on the drive as the source.
This parameter can be set to any other valid position reference generated by the drive or an
option module.
Encoder Simulation Mode (03.088) Set to a value of Ratio (2)
Encoder Simulation Numerator (03.093) and
Encoder Simulation Denominator (03.094)
Set these two parameters to give the required output ratio.
Encoder Simulation Output Mode (03.098)
AB/Gray (0) for a AB quadrature output signals
FD/Binary (1) for Frequency and Direction output signals
FR/Binary (2) for Forward and Reverse output signals
Absolute SSI data, software mode setup
Encoder Simulation Source (03.085)
Set to the parameter number of the position source
Pr 03.029 to use the P1 position interface on the drive as the source.
Pr 03.129 to use the P2 position interface on the drive as the source.
This parameter can be set to any other valid position reference generated by the drive or an
option module.
Encoder Simulation Mode (03.088) Set to a value of SSI (3)
Encoder Simulation SSI Turns Bits (03.096) Set to the number of bits representing the number of turns in the position message.
Encoder Simulation SSI Comms Bits (03.097) Set to the number bits in the whole position message.
Encoder Simulation Output Mode (03.098)
AB/Gray (0) for position data in Gray code format
FD/Binary (1) or FR/Binary (2) for position data in binary format