Kohler Curtis F Series User Manual

2 — INSTALLATION AND WIRING
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022 Return to TOC
pg. 30
Use a 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 360-degree sin/cos sensor rotation per motor pole pair or 360-degree
electrical rotation is also acceptable if the Enable Multiturn Sensor parameter (0x306D) is enabled.
Matching sensor frequency to motor electrical frequency is strongly recommended.
e physical waveforms are not bipolar, but center around an oset voltage (Vo), typically around 2.5V.
e Peak-Peak voltage (Vpp) swing may be as small as 0.625 volts or up to 4 volts (sensors with less than
2Vpp are not recommended). e larger the Vpp range the better the motor control performance. Both
parameters require conguration for the sensor to operate properly.
e sin min, sin max, cos min and cos max parameters are congured during commissioning. ese
are used to normalize the incoming sin/cos signals.
Sine/Cosine Signal tracking
e values of the inputs are tracked to ensure an accurate position can be obtained if the signal
amplitude changes during operation. e amplitude of the signal may alter due to mechanical
tolerances, thermal expansion, magnetic eld strength changes in the actuator magnet etc.
ese signal tolerances must be maintained throughout the application’s operating conditions,
including voltage, temperature, speed and torque ranges.
e Sin/Cos sensor device must be set up with one waveform cycle per motor electrical cycle or
one waveform cycle per mechanical revolution. For a one waveform per electrical cycle sensor,
the Feedback_Multiturn parameter (0x306D) must be set to 1. One waveform cycle per electrical
cycle is strongly recommended.
Table 16 Sin/Cos Sensor Device Electrical Specifications
Signal 23-Pin 35-Pin
Operating Voltage
Signal Range
3
Max Input
Frequency
1
Recommended
Propagation Delay
2
Phase Lag
Input
Impedance
Sine 17 31 0.5–4.5V
(+10% / –0%)
Optimum:
Multiturn sensor.
4Vpp with the signal
centered at 2.5V.
599 Hz
Sinewave
≤20° at 599 Hz ±0.5°
Max difference between
Sine/Cosine inputs
> 50k Ω
Cosine 18 32
VCL Functions VCL Monitor Variables
Motor_RPM
AD_Encoder_Sine
AD_Encoder_Cosine
Encoder_Sin_Calibrated
Encoder_Cos_Calibrated
1
Max input frequency may not exceed max controller electrical fundamental frequency.
2
Minimum propagation delay is necessary to maintain rotor alignment at high speed. Larger delays are acceptable for lower
frequency operation. Consult Curtis with application specifics for more information.
3
The maximum voltage difference between the Sin/Cos waveforms at their maximums and minimums is 78mV.
If the voltages are > 78mV during commissioning the Type 84 Motor Characterization fault is triggered.
Furthermore, their minimum voltage must be > 625mV. (i.e., Sin_Max-Sin_Min & Cos_Max-Cos_Min must be > 625 mV).

Kohler Curtis F Series Specifications

General

Brand	Kohler
Model	Curtis F Series
Category	Controller
Language	English