Understanding Ultra1500 Motor Encoder Feedback Specifications; Volt Incremental Encoders; Volt Serial Encoders; A, B, And I Inputs - Allen-Bradley Ultra1500 2092-DA1 User Manual

2-14 Ultra1500 Connector Data
Understanding Ultra1500
Motor Encoder Feedback
Specifications
Publication 2092-UM001D-EN-P — July 2005
The Ultra1500 can accept motor encoder signals from the following types of
encoders:
•
5 Volt Incremental Encoders with TTL outputs and Hall signals
•
5 Volt Serial Encoders with battery-backed multi-turn capability

5 Volt Incremental Encoders

Incremental encoders must have differential drivers for A
The marker inputs, I , are not used by the drive, but must be differential if the
±
drive needs to output a marker signal to a controller. The drive supports a
maximum line frequency of 4,000,000 lines per second or 16,000,000 counts
per second.
Hall inputs S1, S2, and S3 are single-ended 5V logic, and can also be open
collector type.

5 Volt Serial Encoders

The Ultra1500 supports a serial encoder, known as the SA35. The SA35 device
is a multi-turn absolute device with 131,072 counts/revolution, and can track
±32767 revolutions when battery power is present. This encoder is available in
selected Allen-Bradley servo motors, such as the TL-Series.
The drive is able to automatically detect the motor connected, since the SA35
serial encoders contain unique motor model identifiers. Serial communications
with the encoder use a baud rate of 2.5MHz with bi-directional RS-485
transmission.
A 3.6V battery is required to support the multi-turn capability of the SA35
encoder. The drive supports two methods of battery connections:
•
A single, ½-size AA battery installed on the drive, or
•
An external battery can be connected to I/O connector (CN1), pins 25
and 49.
See the section Absolute Positioning on page 5-16 for more details on
battery-backed absolute encoders.

A, B, and I Inputs

A, B, and I input encoder signals are filtered using analog and digital filtering.
Refer to Figure 2.11 for a schematic of the A, B, and I inputs. The inputs have
, and B inputs.
± ±