Table 15 Digital/Quadrature Encoder Electrical Specifications - Kohler Curtis F Series Manual

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In all cases, connect the sensor to the controller's I/O ground. This is the signals' reference.

Table 15 Digital/Quadrature Encoder Electrical Specifications

Enc 1C
The application must maintain these illustrated signal tolerances throughout the application's
operating conditions, including voltage, temperature, speed and torque ranges. ACIM applications
use the quadrature encoder.
F-Series controllers using FOS versions 4.0 and higher are able to support encoder input frequencies
up to 250 kHz. Encoders operating above 30 kHz, must use an external pull-up resistor circuit as
illustrated. Use the controller's external supplies (5V or 12V) as a source for the pull-up resistors, while
observing the external supply's current limits. Follow the encoder manufacturer recommendations
when sizing the resistors, but typical values are 220Ω for 5V and 470Ω for 12V.
The external pull-up circuit is required for Quatrature Encoders with input frequencies greater than 30 kHz.
1 Specialty Input (future).
Encoders >30kHz require an external pull-up (see circuit).
2
2 — INSTALLATION AND WIRING
Signal Input Voltage
23-Pin 35-Pin
Name
Enc 1A 17 31
Enc 1B 18 32
19 11
1
Enc 2A n/a 12
Enc 2B n/a 14
VCL Functions
Channel A
Channel B
F-SERIES CONTROLLER
ENCODER INPUT CIRCUIT
+5V
2k
R1
uP
1nF
R2
The typical input circuit for the quadrature encoders.
The values of R1/R2 vary between controller models.
The 5V/2k pull-up is enabled when the Quadrature encoder
is selected for input type (Position Sensor Type = Quadrature).
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022
High/Low
Resistance
Voltage
range
Threshold
Impedance
4V max
Rising-edge
2k Ω to 5k
0 – 15V
1V min
Falling-edge
Motor_RPM
360 ° electrical (1 cycle)
90 ° ±30 °
180 ° ±18 °
External Pull-up Circuit
Use +5 or +12 Volts
+5 or +12V
Ext Supply
R*
R*
Input 3 / Enc 1A Encoder_A
Encoder_B
Input 4 / Enc 1B
I/O Gnd
* Follow the encoder manufacturer recommendations when sizing the resistors, but typical values
will be 220 for 5V and 470 for 12V. When using the controller's +5 or +12 volt external power
supplies for other devices, ensure the devices always operate within the supply's current limit.
Pull-up
Maximum A-B Phase
Frequency Range
Input
250k Hz 90° ± 30°
2
5k Ω
VCL Monitor Variables
>10 s
Power Supply
OPEN-COLLECTOR
ENCODER
---------------
> 30 kHz
Ground
Phase Duty
Cycle
50 % ±
10 %
pg. 29