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1.6.2
Operating
Modes
1.6.3
Digital
Outputs
1.6.4
Isolation
1.6.5
Environmental
Conditions
© Copyright 2024
United Electronic Industries, Inc.
The DNx-VR-608 supports the following per-channel modes:
•
Timed Count/Frequency: counts the number of teeth detected during a
specified time interval and returns velocity in teeth/sec or RPM.
•
N-Pulse: measures the time taken to detect N teeth and returns velocity
in RPM.
•
Z-Pulse: measures the number of teeth and the time elapsed between
two Z/Index pulses (The Z/Index tooth is usually a gap or a double tooth
on the encoder wheel).
•
Timed Pulse Period Measurement (TPPM): counts the number of
edges detected within a default measurement window to calculate RPM.
The measurement window dynamically increases when needed to
accommodate slower input frequencies. TPPM is for continuous signals
only, i.e., wheels with no Z-tooth (Revision 2 only).
Channel pairs may be configured for the following modes:
•
Quadrature Encoder: measures relative position and rotational
direction from a quadrature encoder sensor
•
Torque: measures torque in dual-sensor systems by comparing the
timing of the pulses from each sensor (Revision 2 only). Torque Mode is
for analog signals only.
The DNx-VR-608 provides four isolated TTL-level digital outputs that change
state on the threshold crossing of the input waveform. This allows the board to
be used as a signal conditioning front end for existing TTL-based counter test
systems. The board supports a matrix configuration where any input can be
directed to any or all of the digital outputs. See Section 2.2.5 for more
information on supported digital output features for the DNx-VR-608.
On Revision 2 boards, digital outputs may also be used for Z-tooth detection, for
open circuit, stalled rotation, or overspeed alarms, or for generating simulated
VR pulse trains. Also, signals on the internal sync bus can be routed to the
digital outputs.
For applications where the VR-608 is primarily used as a signal conditioner, the
input to DOut mapping can be set to start running at power up, even if the host
Cube or RACK is not running any application software.
Dividers of 2, 4, 8, or 16 can be applied to signals that are routed to the digital
outputs. The signals can be inverted, i.e., phase shifted. The output pulse will
always have a 50% duty cycle.
The DNx-VR-608 offers 350 Vrms of isolation between itself and other I/O
boards as well as between the I/O connections and the chassis. In addition, the
inputs are divided into four sets of channel pairs, and each two-channel pair is
isolated from the others. Each isolated channel pair is also supported with a
logic level digital output.
Like all UEI I/O boards, the DNx-VR-608 offers operation in extreme
environments and has been tested to 5 g vibration, 100 g shock, temperatures
from -40 to +85 °C, and will function at altitudes up to 70,000 feet.
February 2024
DNx-VR-608 Variable Reluctance Interface
Chapter 1
5
Introduction
www.ueidaq.com
508.921.4600
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