Technical data

• DOK-DIAX02-DDC01******-PRJ1-EN-E1,44 • 01.97

3. Electrical Connections - Installation Guidelines

3.21. Fault Current Protective Device

Capacitive discharge currents always flow to earth in switch-mode drives.

The extent of the discharge current is dependent upon:

• the number of drives used,

• the length of the motor power cable,

• the motor type and

• the ground conditions at the installation site.

The discharge current is unavoidably increased, if measures are taken to

improve the electromagnetic compatibility (EMC) of the machine (mains filters

or shielded cables).

FI current limiting circuit breakers with a nominal fault current smaller than

0.3 A should not be used!

Switching inductors on, e.g., transformers, contactors or electromagnetic

valves, can cause false tripping.

The safety of electronic equipment with three-phase bridge

connections, B6 switches, cannot be guaranteed if commercial,

pulse-current sensitive FI protective circuit breakers are used. For

this reason, FI circuit breakers should not represent the only safety

measures taken.

3.22. High-Voltage Testing

Connect only those voltages outlined in the data sheets or in the

interface descriptions.

Remove all connections to the DDC 1 before performing any high

voltage checks.