Curtis 1239E - Position Feedback Input: Quadrature Encoder; Position Feedback Input: Sin;Cos Sensor (encoder)

2 — INSTALLATION AND WIRING
Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
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pg. 20
Position Feedback Input: Quadrature Encoder
Two control lines are internally congured to read a quadrature type position encoder. e encoder
is typically powered from the 5V supply (pin 26) or 12V supply (pin 25), but can be powered from
any external supply (from 5V up to B+) as long as the logic threshold and differential voltage
requirements are met. e quadrature encoder is used in ACIM applications.
QUADRATURE ENCODER INPUT SPECIFICATIONS
Signal Name Pin
Logic
Threshold
Input
Impedance
Max.
Frequency
Protected
Voltage
ESD
Tolerance
Position Feedback A 31
Rising
edge = 2.9V
max
Falling
edge = 2.0V
min
2 kΩ
(internal pull-
up to +4.5 V)
10 kHz
–5V to (MaxV
+ 10V)
± 8 kV
(direct
strike)
Position Feedback B 32
Phase Shift 90° ±30, Duty Cycle 50% ±10%; no signal edge can be closer than 10 µs to an adjacent edge.
13
24
1
23
35
12
ese signal tolerances must be maintained throughout the application’s operating conditions,
including voltage, temperature, speed and torque ranges.
Channel A
Channel B
360° electrical (1 cycle)
>10 μs90° ±30°
180° ±18°
Position Feedback Input: Sin/Cos Sensor (encoder)
Use the Sin/Cos sensor in PMAC applications.
A Sine/Cosine encoder is an absolute position sensor that produces two sinusoidal signals, set
90° out of phase. Measurement and comparison of the two signals at any point can determine the
absolute position of the sensor. One motor (rotor) mechanical revolution per 360° sin/cos sensor
rotation (sweep).
e physical waveforms are not bipolar, but center around an oset voltage (Vo), typically around
2.5 Volts. e Peak-Peak voltage (VPP) swing may be as small as 2V or up to 4V, the bigger the range
the better the performance for motor control. Both parameters require conguration for the sensor
to operate properly.
Congure the Sin Min, Sin Max, Cos Min and Cos Max parameters during commissioning. ese
normalize the incoming sin/cos signals.
Quick Link:
Figures 5 & 6 wiring
diagram p.12-13