Operating instructions

Safety instructions and approvals
2.4 Electromagnetic compatibility
MP 377, MP 377 PRO (WinCC flexible)
42 Operating Instructions, 10/2008, 6AV6691-1DR01-0AB0
2.4 Electromagnetic compatibility
Introduction
The HMI device fulfills, among other things, the requirements of the EMC law pertaining to
the domestic European market.
EMC-compatible installation of the HMI device
The EMC-compliant installation of the HMI device and the application of interference-proof
cable is the basis for interference-free operation. The "Directives for interference-free
installation of PLCs" and the "PROFIBUS Networks" manual also apply for the installation of
the HMI device.
Pulse-shaped disturbance
The following table shows the electromagnetic compatibility of modules with regard to pulse-
shaped interference. The precondition for electromagnetic compatibility is that the HMI
device meets the specifications and guidelines for electrical installation.
Pulse-shaped disturbance Tested with Degree of
severity
Electrostatic discharge
in accordance with
IEC 61000-4-2
Air discharge: 8 kV
Contact discharge: 6 kV
3
Burst pulses
(high-speed transient
interference)
in accordance with
IEC 61000-4-4
2 kV power supply cable
2 kV signal cable, > 30 m
1 kV signal cable, < 30 m
3
High-power surge pulses in accordance with IEC 61000-4-5, external protective circuit required
(refer to the manual Automation System S7-300, Installation, "Lightning and
overvoltage protection" section)
Asymmetrical coupling 2 kV power cable
DC voltage with protective elements
2 kV signal/data cable, > 30 m,
with protective elements as required
3
Symmetrical coupling 1 kV power cable
DC voltage with protective elements
1 KV signal cable, > 30 m,
with protective elements as required
3