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4-9
Shielding the pulse signal.
If positioning point deviation results after power supply separation, connect both ends of the shield
of the command pulse signal lines (twisted-pair shield wires) on the Position Control Unit and Servo
Driver sides to the FG (frame ground).
Note
Ground the Position Control Unit and Servo Driver at a resistance of less than 100
W
. Incorrect
grounding has a worse influence on the Servo System.
Applicable Models
C200H-NC112/NC211, C500-NC111-EV1
D
Positioning Point Deviation (Position Control Unit with Analog Output)
Error
The encoder’s feedback pulse signals subjected to noise interference and the Position Control Unit
handles the noise as feedback pulses.
Countermeasures
Shielding the feedback pulse signals.
Connect both ends of the shield of the feedback pulse signal lines (twisted-pair shield wires) on the
Position Control Unit and Servo Driver sides to the FG.
Note
Ground the Position Control Unit and Servo Driver at a resistance of less than 100
W
. Incorrect
grounding has a worse influence on the Servo System.
Applicable Models
C500-NC103/NC222-E
D
Speed Error (R Series Only)
Error
The serial communications block between the Servo Driver and encoder is subjected to noise interfer-
ence. Therefore, a speed error is detected by mistake even though the rotation speed is not high. This
error will occur if the motor is mounted to a movable part and the motor frame is not perfectly grounded.
Countermeasures
Ground the motor frame.
Connect the motor frame to the FG of the machine system. Then ground the FG at a resistance of
less than 100
W
.
Shield the encoder signal wires.
Connect both ends of the shield of the encoder cable (twisted-pair shield wires) on the Servo Driver
and motor sides to the FG.
Note
Ground the Servo Driver and motor at a resistance of less than 100
W
. Incorrect grounding has
a worse influence on the Servo System.
Countermeasures Against Noise
Chapter 4
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