Lenze 8250 series Brake unit - Manual (Page 24)

Installation
8250BA0903 4-5
4.2.2 Protection of the brake unit
Stop!
The brake units contain electrostatically sensitive components.
• Prior to assembly and service operations, the personnel
must be free of electrostatic charge:
- They can discharge themselves by touching the PE
fixing screw or another grounded metal part in the
control cabinet.
• In the event of condensation connect the brake unit to
mains voltage only after the visible humidity has
evaporated.
4.2.3 Specification of cables used
• The cables used must comply with the approvals required
at the site (eg. UL).
• The prescribed minimum cross-sections of PE conductors
must be maintained in all cases. The cross-section of the
PE conductor must be at least as large as the
cross-section of the power connections (VDE 0160).
• The screening quality of a cable is determined by
- a good screen connection
- a low screen resistance
Use only screens with tin-plated or nickel-plated copper
braid!
Screens of steel braid are not suitable.
- the degree of coverage of the screen braid:
at least 70% to 80% with a coverage angle of 90 °
Note!
The screens are only required to comply with existing standards
(e.g. VDE 0160, EN 50178).
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