Noise Reduction Techniques - Mitsubishi Electric MELSERVO-J4 Instruction Manual

9. OPTIONS AND PERIPHERAL EQUIPMENT
Servo amplifier
MR-J4-60_4(-RJ)
MR-J4-100_4(-RJ)
MR-J4-200_4(-RJ)
MR-J4-350_4(-RJ)
MR-J4-500_4(-RJ)
MR-J4-700_4(-RJ)/
MR-J4-11K_4(-RJ)
MR-J4-15K_4(-RJ)
MR-J4-22K_4(-RJ)
Note. Maximum dimensions. The dimension varies depending on the input/output lines.

9.10 Noise reduction techniques

Noises are classified into external noises which enter the servo amplifier to cause it to malfunction and those
radiated by the servo amplifier to cause peripheral equipment to malfunction. Since the servo amplifier is an
electronic device which handles small signals, the following general noise reduction techniques are required.
Also, the servo amplifier can be a source of noise as its outputs are chopped by high carrier frequencies. If
peripheral equipment malfunction due to noises produced by the servo amplifier, noise suppression
measures must be taken. The measures will vary slightly with the routes of noise transmission.
(1) Noise reduction techniques
(a) General reduction techniques
Avoid bundling power lines (input/output) and signal cables together or running them in parallel to
each other. Separate the power lines from the signal cables.
Use a shielded twisted pair cable for connection with the encoder and for control signal
transmission, and connect the external conductor of the cable to the SD terminal.
Ground the servo amplifier, servo motor, etc. together at one point. (Refer to section 3.11 of "MR-
J4-_A(-RJ) Servo Amplifier Instruction Manual" or "MR-J4-_B(-RJ) Servo Amplifier Instruction
Manual".)
(b) Reduction techniques for external noises that cause the servo amplifier to malfunction
If there are noise sources (such as a magnetic contactor, an electromagnetic brake, and many
relays which make a large amount of noise) near the servo amplifier and the servo amplifier may
malfunction, the following countermeasures are required.
Provide surge absorbers on the noise sources to suppress noises.
Attach data line filters to the signal cables.
Ground the shields of the encoder connecting cable and the control signal cables with cable clamp
fittings.
Although a surge absorber is built into the servo amplifier, to protect the servo amplifier and other
equipment against large exogenous noise and lightning surge, attaching a varistor to the power
input section of the equipment is recommended.
Power factor
improving AC Dimensions
reactor
FR-HAL-H1.5K
FR-HAL-H2.2K Fig. 9.4
FR-HAL-H3.7K
FR-HAL-H7.5K
FR-HAL-H11K
Fig. 9.5
FR-HAL-H15K
FR-HAL-H22K
Fig. 9.6
FR-HAL-H30K
9 - 45
Dimensions [mm]
D
W W1 H
(Note)
135 120 115 59 59.6
135 120 115 59 59.6
135 120 115 69 70.6
160 145 142 91
160 145 146 91
220 200 195 105
220 200 215 170
220 200 215 170
Termina
l size
D1 D2 d
45 M4 M3.5
45 M4 M3.5
57 M4 M3.5
91 75 M4 M4
91 75 M4 M5
90 70 M5 M5
90 70 M5 M8
96 75 M5 M8
Mass
[kg]
1.5
1.5
2.5
5.0
6.0
9.0
9.5
11