
5. The power supply unit with SELV (Safety Extra Low Voltage) or PELV (Protective Extra
Low Voltage) that comply with the EMC Regulations must be used (if the UKCA
marking compliance is required).
6. The power supply unit must support Class 2 (if marking compliance is
required).
●If surges occur, take countermeasures such as connecting a surge absorber to the source
of the surges.
● If large noise is generated in the power supply line, the analog output is affected. In that
case, use a noise filter or noise cut transformer.
● When using a transformer in the power supply line, be sure to use an isolation transformer.
If an autotransformer is used, this product or power supply may be damaged.
● To protect the system against erroneous voltage from the power supply line, use an
insulated power supply with an internal protective circuit.
● If using a power supply unit without a protective circuit, be sure to supply power via a
protective element such as a fuse.
● Have the power supply sequence such that the power supply of the sensor turns ON before
the power supply for the input and output.
● Have the power supply sequence such that the power supply for the input and output turns
OFF before the power supply of the sensor.
● After turning OFF the power supply of the sensor, wait for at least ten seconds before
turning ON the power supply.
● After the power is turned ON, the starting up operation before reaching the operation status
is unstable. During the starting up operation, all the outputs are not determined yet, so do
not use those outputs.
● Never turn OFF the power supply in the middle of saving the settings such as teaching or
PRO mode settings. In the worst case, the memory in the sensor may be damaged and
restarting may not be possible.
● Depending on the instantaneous power failure time, there are cases where the operation is
continued or where the operation is reset to the initial state as when the power is turned
ON. Do not use the product in an environment where instantaneous power failure may
occur.
Wiring
● Before wiring work, always turn the power off.
● Do not wire in parallel with a high-voltage line or power line, or run through the same
conduit. Doing so may result in malfunctioning due to induction.
● Apply a load so that a current of 50 mA or more does not flow through the control output
line. Also avoid incorrect wiring such as polarity connection error of the power supply.
Failure to do so may cause damage or burning.
● The overall length of the cable can be extended to 10 m maximum with a cable size of 0.3
mm2 or more. Use a shielded cable to extend the analog wire line.
● Avoid wiring the sensor cable together with other wiring (bundling in parallel) and, instead,
separate the sensor cable from other wiring as much as possible. Also, separate the sensor
cable from high voltage circuit or power circuit. If unavoidable, shield the sensor cable with
conductor such as a grounded conduit.
● For signal lines such as I/O terminals, it is recommended to use a shielded cable to prevent
noise.
● Separate the input signal line and output signal line from the power line and power supply
line as much as possible. Furthermore, make each line as short as possible for connecting
various signal lines.
1.2 Handling Precautions
1-4 WUME-HGF1UM-2
Ramco
Innovations
www.ramcoi.com
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