Mitsubishi Electric ER-1V680D1 User Manual page 143

Installation in control panel
A programmable controller is an open-type device and required to install in a control panel.
Installing a programmable controller in a control panel has a great effect not only for ensuring safety but also for shielding
noise generated from the modules.
■Control panel
• Use a conductive control panel.
• After fixing the top plate and bottom plate of control panel with bolts, mask the grounding part of the control panel not to
paint the part.
• The inner plate in the control panel requires the electric contact with the body of control panel. Secure conductivity in the
wide area as much as possible by masking the bolts mounting to the body.
• Ground the control panel with a thick ground cable so as to secure the low impedance even if in the high frequency.
• Use a control panel with a hole less than 10cm in diameter. If the hole is larger than 10cm in diameter, radio wave can leak.
Radio wave leaks from the gap between the control panel door and the body. Install them with no gap. If there is a gap, seal
the painted surface with the EMI gaskets of the following manufacturer to close the gap and suppress leakage of radio
wave.
Manufacturer
KITAGAWA INDUSTRIES CO., LTD.
Zippertubing (Japan), Ltd.
SEIWA ELECTRIC MFG. CO., LTD.
Our company tested to the damping characteristic control panel with maximum 37dB and average 30dB (30 to 300MHz, 3m
measurement)
■Power cable and ground cable
• Set the grounding point of control panel near the power supply module, and ground the LG (line ground) terminal and FG
(frame ground) terminal with as thick and short ground cable as possible (length: 30cm or shorter). Shorten the ground
cable as possible.
• Twist the ground cable drawn out from the grounding point with the power cable. When a noise filter is mounted to the
power cable, the power cable may not need to twist with the ground cable.
■DIN rail
An aluminum DIN rail may be covered with an insulating film. If the DIN rail does not contact with the programmable controller
electrically, secure conductivity as much as possible. The following methods are available to secure conductivity.
• Screw the programmable controller to the control panel. (Do not use the DIN rail.)
• Use an iron DIN rail including TH35-7.5Fe and TH35-15Fe.
■Power supply module
Short-circuit and ground LG and FG terminals.
■External power supply
• Use an external power supply conformed to CE marking and ground the FG terminal.
• Use connectors of 10m or shorter for external power supply.
Inquiry destination
www.kitagawa-ind.com
www.ztj.co.jp
www.seiwa.co.jp
Appendix 5 EMC and Low Voltage Directives
A
APPX
141