4-10
4-10
D
Motor Vibration (M Series Only)
Error
The resolver signal is subjected to noise interference and the motor vibrates because the electric poten-
tial of the FG (frame ground) of the motor is unstable.
Countermeasures
Connect the motor frame and the FG of the Servo Driver with a cable of 2.0 mm
2
or more in thickness.
D
Incorrect Grounding
Error
If a ground wire is not grounded correctly at a resistance of less than 100
W
, the ground wire will gener-
ate noise. If the noise cannot be reduced, check the electric potential of the ground.
Countermeasures
Ground the wire in a different place where the wire can be grounded at a resistance of less than 100
W
.
Improve the present grounding condition.
Separate the FG of high-power equipment from that of low-power equipment.
Do not ground the FG lines of the control equipment and other equipment in use.
Cut the shield of the cable.
This should be taken as the last resort, in which case, however, the Servo System will not be able to
fulfill its functions because of such poor operating conditions.
4-2-4 Noise Suppression Example
D
Phenomena
Positioning deviation results in a system in which the C200H-NC112 Position Control Unit, U-series AC
Servomotor, and U-series Servo Driver are connected. Positioning is possible but the stop position will
deviate in this system.
D
Countermeasures
[a] Power Supply to Servo Driver and FG
·
Connect a noise filter to the power lines and reduce the length of the power lines to the system as much
as possible.
·
Connect the FG (frame ground) to the ground plate through a wire of 2 mm
2
or more in thickness.
[b] Servo Motor FG
·
Connect the FG to the machine ground through a wire of 3.5 mm
2
or more in thickness.
[c] Power Supply to C200H and FG
·
Connect a noise filter to the power lines.
·
Connect the FG to the ground plate.
[d] Power Supply for Position Control Unit’s Command Pulse Use
·
Use a dedicated power supply for command pulse use.
·
Connect a noise filter to the input side of the power supply.
Countermeasures Against Noise
Chapter 4
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