Electric Cabling And Wiring; Safety Instructions For Electric Cabling And Wiring - DEMAG DIC 002 Series Operating Instructions Manual

6.5

Electric cabling and wiring

6.5.1

Safety instructions for electric cabling and wiring

Electric cabling and wiring work must be carried out by qualified personnel according to the general and regional
safety and installation regulations. Electric installation work and commissioning must be carried out according to
the documentation and device specifications to ensure safe operation of the frequency inverter. Under special ap‐
plication conditions, further regulations and guidelines may also have to be considered.
DANGER
Electric shock, live components
Contact with live components may result in danger to life and limb.
The line, DC and motor terminals may only be connected when they are not live and after they have been dis‐
connected. The terminals may carry dangerous voltages after the frequency inverter has been safely disconnec‐
ted. Work on the unit may only be carried out after 3 minutes have elapsed to allow the link capacitors to dis‐
charge.
– Only carry out maintenance and installation work when all cables, motor terminals and capacitors are at
zero potential (check with a voltmeter).
The connecting cables must be protected externally in compliance with the maximum voltage and current values
of the fuses. The mains fuses and cable cross-sections must be designed for the rated operating point of the fre‐
quency inverter according to EN 60204-1 or DIN VDE 0298, part 4. According to UL/CSA the frequency inverter is
suitable for operation in a power supply network of max. 480 V AC, which supplies a symmetrical current of max.
5000 A root-mean-square value if it is protected with RK5 class fuses. Only use copper cables with a temperature
range of 60/75 °C.
Electric cabling and wiring work must be carried out as specified for the unit and according to the relevant stand‐
ards and regulations.
● Frequency inverters must be correctly connected to earth over a large surface area to ensure good conductivi‐
ty. The leakage current of frequency inverters may be > 3,5 mA, a fixed connection must be provided in ac‐
cordance with the DIN EN 50178 standard.
If the leakage current of a permanently connected frequency inverter in normal service exceeds 3,5 mA, one of
the following conditions must be satisfied:
- The protective earth conductor cross-section required for earthing the installation surface must be at least
10 mm² of copper.
- A second protective earth conductor must be connected in parallel to the first. The cross-section in these
applications must correspond to the recommended cable cross-section.
- The protective earth conductor must be monitored by a device that results in automatic shutdown of the fre‐
quency inverter in the event of a failure.
● The frequency inverters are connected to the mains power supply via the X1 terminals.
● IP20 type of enclosure (EN 60529) is only ensured when the plug-in terminals are connected.
● Control, power supply and motor cables must be laid separately. Suitable precautions must be taken before
the cables connected to the frequency inverter are subjected to insulation tests at high test voltages.
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