Ratio; Software Mode - Absolute Ssi Data - Emerson Unidrive M702 User Manual

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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).
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)
Encoder Simulation Mode (03.088)
Encoder Simulation Numerator (03.093) and
Encoder Simulation Denominator (03.094)
Encoder Simulation Output Mode (03.098)

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.
Absolute SSI data, software mode setup
Encoder Simulation Source (03.085)
Encoder Simulation Mode (03.088)
Encoder Simulation SSI Turns Bits (03.096)
Encoder Simulation SSI Comms Bits (03.097)
Encoder Simulation Output Mode (03.098)
Unidrive M702 User Guide
Issue Number: 3
Electrical Getting Basic
installation started parameters the motor
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.
Set to a value of Ratio (2)
Set these two parameters to give the required output ratio.
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
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.
Set to a value of SSI (3)
Set to the number of bits representing the number of turns in the position message.
Set to the number bits in the whole position message.
AB/Gray (0) for position data in Gray code format
FD/Binary (1) or FR/Binary (2) for position data in binary format
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