Siemens LOGO! CMR2040 Operating Instructions Manual page 36

Installation, connecting up, commissioning
3.1 Important notes on using the device
External power supply
● Use only an external power supply that complies with EN 60950.
● The output voltage of the external power supply must not exceed 30 VDC.
● The output of the external power supply must be short-circuit proof.
NOTICE
Power supply
The power supply unit to supply the CMR must comply with the requirements for a limited
power source according to IEC/EN 60950-1, section 2.5.
The external power supply for the CMR must meet the requirements for NEC class 2
circuits as specified in the National Electrical Code ® (ANSI/NFPA 70).
Note the information in this section and in the installation and operating instructions from the
manufacturer of the power supply.
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS complying with IEC 60950-1 / EN 60950-1 / VDE 0805-1
must be connected to the power supply terminals. The power supply unit for the equipment
power supply must comply with NEC Class 2, as described by the National Electrical Code
(r) (ANSI / NFPA 70).
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
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WARNING
WARNING
WARNING
LOGO! CMR2020,
Operating Instructions, 10/2016, C79000-G8976-C356-03
LOGO! CMR2040