Measures to reduce noise
• Install the product as far away as possible from noise source such as high-voltage lines, high-voltage device, power lines,
power device, machines which generate a large starting and stopping surge, welding machines, and inverter motor.
• Install the product as far away as possible from a wireless device that has a transmitter, such as an amateur radio device.
• Do not run the sensor head cable along (bundled in parallel) with other wirings. Keep it at least 100mm away from other
wires. Run the cable so that it is separate from high voltage and power circuit lines. If it is necessary to run the cable in
parallel with them, shield the cable by running it through a grounded electrical conduit.
• Ground FG with a ground resistance of 100 ohms or less and avoid sharing the ground with other devices. This may
produce an opposite effect.
• Connect a noise filter to the external power supply. Use a noise filter with the damping characteristic, RSEN-2006
(manufactured by TDK-Lambda Corporation) or equivalent. For details on a noise filter, refer to the following.
MELSEC iQ-R Module Configuration Manual
Insulation resistance and withstand voltage
Do not perform insulation resistance and withstand voltage tests between an exposed metal part of the sensor head
connector and the entire sensor head. Doing so may cause failure.
■External power supply of the control module
• For the external power supply voltage, use the system within the rated voltage range of 20.4 to 28.8VDC.
• For the external power supply, use the control module with the satisfied performance specifications. ( Page 17
• When using a commercial switching regulator for the external power supply, be sure to ground the FG terminal to avoid the
influence of high frequency noise. Do not cascade the FG terminal between control modules.
• When using a transformer in the external power supply, be sure to use an insulated transformer. The product or the external
power supply may be damaged if an auto transformer is used.
• Use an insulated external power supply incorporating a protective circuit to protect it against abnormal voltages from the
• When using a power supply not incorporating a protective circuit, be sure to power on through a protective element such as
■Power supply sequence for the control module and the programmable controller
• Turn on the external power supply, and then turn on the programmable controller.
• If the external power supply is not supplied more than five seconds after the programmable controller is powered on, the
external power supply interruption error (error code: 3010H) occurs.
• Turn off the programmable controller first, then, turn off the external power supply. If the external power supply turns off
prior to the programmable controller, the control module may malfunction.
• Leave an interval for at least 10 seconds between turning off the programmable controller and turning on the power again.
Failure to do so may corrupt saved data.
• It takes about 40 to 50 seconds from power-on to operating state (startup completed), depending on the settings saved.
Because outputs are not determined during startup, do not use them. Doing so may cause malfunction of devices due to an
• Do not turn off the power while saving the settings. In the worst case, the system of the control module is destroyed and fail
• When a sensor head is start-up (the laser radiation indicator (LASER ON) is on), laser emission starts regardless of
whether the state of CPU module is RUN or STOP.
• Be careful that not to point the laser beam to people's eyes when the sensor head is start-up.
6 INSTALLATION AND WIRING
6.1 Correct Usage