Loopback Test Wiring (Rev. 2); Example Wiring For Torque Simulator Loopback - Ametek DN VR-608 Series User Manual

2.6.1 Loopback Test
Wiring (Rev. 2)
© Copyright 2024
United Electronic Industries, Inc.
VR Sensor Polarity
On the DNx-VR-608, tooth detections correspond to negative slope zero
crossings. If your VR sensor is wired for positive slope zero crossings (or if the
wheel has holes instead of teeth), simply switch the In+ and In- wires. You can
monitor both types of zero crossings by reading the ADC status.
Revision 2 boards can generate simulated digital VR signals. By wiring the
digital output to an input channel, basic software functionality may be tested
without needing to connect a physical VR sensor.
• When simulating a digital sensor, connect DOut -> DIn and DOGnd ->
DIGnd as you would for a real sensor.
•
When simulating an analog sensor, an external capacitor between DOut
and In+ converts the 0-5 V simulator output to the bipolar input expected
by the Dual VR IC. This allows you to transition from simulator to sensor
without software changes. Coupling capacitors are necessary for
Torque Mode loopback tests (see Figure 2-12).The capacitor is optional
for Timed, TPPM, N-Pulse, and Z-Pulse mode simulations as long as
the front end is configured for a digital input i.e., ZC_LOGIC or
ZC_FIXED. Real VR sensors connect directly to the DNx-VR-608
without a capacitor.
VR-608
DOut 0
DOGnd 0
DOut 1
DOGnd 1
Figure 2-12 Example Wiring for Torque Simulator Loopback
February 2024
DNx-VR-608 Variable Reluctance Interface
Functional Description
VR-608
1000pF - 1μF
In 0+
In 0-
In 1+
In 1-
Chapter 2 24
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