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Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 5
Component Definition and Maintenance
To select the dual encoder option, remove the CD_QUAD jumper and place it in
PARK. This will configure the board to accept two individual quadrature
encoders. In this mode, the drive can switch between encoders for applications
such as Synchronous Transfer between two motors with each having their own
encoder.
For redundant encoder option, remove both the CD_QUAD and
POL_QRDNT jumpers and place them in PARK. With this configuration, the
drive will switch over to the redundant encoder when it detects a problem with
the primary encoder.
Positional Encoder Operations
(1)
Besides quadrature encoders, the Universal Encoder Interface will also accept
positional (absolute) encoders. Parallel positional data is converted to a serial
stream and transmitted to the DPM when requested by the drive. The board will
also generate “pseudo” quadrature differential signals, including a zero position
mark, derived from the binary data to the DPM.
There are three different positional encoder configurations available. For all of
these configurations remove the ENC_TYPE jumper. The other jumpers
configure the board for the type of positional data (Gray Code or Natural
Binary) set by CD_DQUAD and High or Low True data set by POL_QRDNT.
1. Gray code, Low True
. In this configuration the board will invert the
incoming gray code data and then convert it to binary for transmission to
the DPM.
2. Natural Binary, Low True
. No conversion is done on the incoming data
but it is inverted.
3. Gray code, High True
. In this configuration, the incoming gray code data
is simply converted to binary. No inversion is done on the input data.
4. Natural Binary, High True
. The positional data is simply converted to
the serial stream. No inversion or conversion is done on the data.
ATTENTION:
When the drive switches over to the redundant encoder, it cannot
switch back without recycling control power.
(1) Consult factory for availability of Positional Encoders
