Example Of Measure Against Noise - Mitsubishi Electric Q170MSCPU User Manual

7 EMC DIRECTIVES

7.1.4 Example of measure against noise

Motion controller
AC power
NF
supply
4)
1) Ground the FG terminal of the Motion controller and 24VDC power supply module to the control panel.
2) Measure against noise of the power supply cable (24VDC twisted cable)
3) Measure against noise of the extension cable (QC B)
4) Install a ferrite core in the secondary side of NF. (Approx. 1 turn)
5) Measure against noise of the internal I/F connector cable
Control panel A
SSCNET cable
Ethernet cable
(Shield tuisted pair of
category 5 or more)
5)
Internal I/F
connector cable
1)
5)
2)
Extension cable (QC B)
3)
24VDC
power supply
Wire the power supply cable as short as possible using the twisted cable.
Install a ferrite core at a position 20 to 30cm (7.87 to 11.81inch) away from the product.
Ground the cables at a position 20 to 30cm (7.87 to 11.81inch) away from the module with the cable clamp, etc.
When the cables are extracted from the control panel, ground the cables at a position 5 to 10cm (1.97 to 3.94inch) away
from the exit/entrance of the control panel with the cable clamp, etc.
Install a ferrite core at a position 20 to 30cm (7.87 to 11.81inch) away from the module.
Ground the cables at a position 30 to 40cm (11.81 to 15.75inch) away from the module with the cable clamp, etc.
When the cables are extracted from the control panel, ground the cables at a position 5 to 10cm (1.97 to 3.94inch) away
from the exit/entrance of the control panel with the cable clamp, etc.
(1) Refer to Section 2 for the following cables.
• Ethernet cable
• RS-232 communication cable
• USB cable
• SSCNET cable
• Extension cable
• Forced stop input cable
(2) Refer to APPENDIX 4.4 for the internal I/F connector cable.
Correctly wire the internal I/F connector cable. Use the shielded twisted pair cable.
(3) In wiring inside the panel, the power line connected to the power or servo
amplifier and the communication cable such as bus connection cable or network
cable must not be mixed. If the cables are installed closely with each other for
wiring reasons, using a separator (made of metal) can make the cables less
influenced by noise.
Mixing the power line and communication cable may cause malfunction due to
noise.
: AD75CK cable clamp
: Ferrite core (Recommended product: ZCAT3035-1330)
Manual pulse generator/
Synchronous encoder/
DI/DO
5)
3) 3)
7 - 8
Control panel B
Extension base