Siemens IFP1900 INOX PRO Compact Operating Instructions page 16

Installing the device
3.2 Mounting and connecting the device
Connecting the device and closing the connection compartment
Important notes on connecting
The protective conductor connection is needed to protect the device and helps ensure that
interference signals generated by power lines, signal lines or lines to I/O devices are safely
discharged to earth.
The protective conductor connection on the device must be connected to the protective
conductor of the control cabinet or system in which the device is installed.
Electric shock and fire hazard when protective conductor is not connected
High voltage may be present in a defective device, which can cause fire or an electric
shock if touched. Death and serious bodily injury can result.
• Connect the device to the protective conductor before you put it into operation.
• Never operate the device without protective conductor.
• If a device is defective, remove it from operation without delay and label it accordingly.
Risk of fire and electric shock
Risk of electric shock if the device is opened incorrectly or defective. There is also a risk of
fire if the device or connecting lines are damaged.
You should therefore protect the device as follows:
• Always pull out the power plug when you are not using the device or if the device is
• Connect the device to a protective conductor as instructed (see "Connecting the
• Use a central isolating switch in the case of cabinet installation.
NOTICE
Safe electrical isolation
The device may only be connected to a 24 V DC power supply that meets the requirements
of a safe extra-low voltage (SELV) according to IEC/EN/DIN EN/UL 60950-1 or the
requirements of a secure extra-low voltage (SELV/PELV) according to IEC 61131-2.
The power supply must meet the requirements of NEC Class 2 or LPS according to
IEC/EN/DIN EN/UL 60950‑1.
The supplying source must be fused for a power rating < 240 VA;
recommended fuse rating ≤ 8 A.
16
WARNING
WARNING
defective. The power plug must be freely accessible.
protective conductor").
Compact Operating Instructions, 07/2019, A5E35751632-AC
IFP1900 INOX PRO