HEIDENHAIN MANUALplus 620 Technical Manual page 152

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3.1.2 Degrees of protection

3.1.3 Electromagnetic compatibility

Likely sources of

interference

The interfaces for the PLC inputs/outputs, machine operating panel and PL

connection comply with the requirements for basic insulation in accordance

with IEC 742 EN 50 178.

Only units that comply with the requirements of IEC 742 EN 50 178 for

basic insulation may be connected, otherwise damage to persons or prop-

erty may be caused. The maximum dc voltage mean value of the PLC

inputs is 31 V.

The following components fulfill the requirements for IP54 (dust and splash-

proof protection).

Visual display unit (front, when properly installed)

Keyboard unit (front, when properly installed)

Machine operating panel (front, when properly installed)

Handwheel (built-in or connected, depending on the type)

All electric and electronic control components must be installed in an environ-

ment (e.g. electrical cabinet, housing) that fulfills the requirements of protec-

tion class IP54 (dust and splash-proof protection) in order to fulfill the require-

ments of contamination level 2.

All components of the OEM operating panel must also comply with

protection class IP54, just like the HEIDENHAIN operating panel

This unit fulfills the requirements for Class A according to EN 55022 and is

intended for operation in industrially zoned areas.

Protect your equipment from interference by observing the following rules and

recommendations.

Interference is mainly produced by capacitive and inductive coupling from

electrical conductors or from device inputs/outputs, such as:

Strong magnetic fields from transformers or electric motors

Relays, contactors and solenoid valves

High-frequency equipment, pulse equipment and stray magnetic fields from

switch-mode power supplies

Power lines and leads to the above equipment

HEIDENHAIN Technical Manual MANUALplus 620