Encoder Loss Detection - Omron CK3M Seres Hardware User Manual

Connection diagram
*1. This function is available with the CK3W-AX1313£/-AX1414£/-AX1515£ Units.
*2. With single-ended input, only a voltage output type encoder can be connected. Open collector type encod-
ers cannot be connected.
*3. This function is available with the CK3W-AX2323£ Units.
*4. The maximum input frequency in normal specification is 2 MHz, however, you can use the connector with
frequency up to 8 MHz in the following conditions.
•
Set Gate3[i].EncClockDiv=1 to use with the input frequency of 2 MHz or higher.
Set Gate3[i].EncClockDiv=3 (Default) to use with the maximum input frequency of 2 MHz or lower.
•
A temporary error of four counts in the integer part (Position fluctuation) may occur periodically with the
input frequency of 1.5 MHz or higher, however, the errors are not accumulated.
The error does not occur with the frequency of 1.5 MHz or lower and the position is output normally.
Use with the frequency of 2 MHz or lower when the temporary error during operation is an issue.
•
Gate3[i].Chan[j].SosError may occur with the frequency of 2 MHz or higher.
Use a user program to check the encoder loss detection using Gate3[i].Chan[j].SumOfSquares and with-
out using Gate3[i].Chan[j].SosError.
When you set Gate3[i].Chan[j].SumOfSquares, set the threshold value to half of the value of
Gate3[i].Chan[j].SumOfSquares when operated with the maximum input frequency.
*5. A Hall sensor is a sensor that detects the rotor position of the motor by detecting the magnetic field. This is
normally used to check the position when the power is turned ON.
*6. HALL T is not normally used, however, it can be used as a general 5V digital input.
*7. This output function is available with the CK3W-AX1414£/1515£ Units.
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Encoder Loss Detection

Encoder Loss Detection in Digital Quadrature Encoder
Encoder loss detection is a function for detecting the encoder detachment. It can detect the encoder
loss, and stop the motor.
In the differential input for the digital quadrature encoder, when a correct signal arrives in encoder A
+/A-, encoder B+/B-, if the signal level is H in one side, the signal level of the other side is always L.
Encoder A+/B+
Encoder A-/B-
You can detect the encoder loss by setting a circuit so that both signals turn H or L when the encoder
is not connected.
CK3M/CK5M Series Programmable Multi-Axis Controller Hardware User's Manual (O036)
H
L
H
L
OutFlagB
GND
Connector shell
For the GND, use an encoder power source (GND).
H
L
H
L
3 Configuration Units
L
H
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3