Residual Current Devices Fi - Pilz PMCtendo DD5 Operating Manual

6 Wiring
6.3 Wiring guidelines
6.3.1.2

Residual current devices FI

6- ][Verdr_FI Residual current devices FI
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
6-6
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
The ready-made cables from Pilz are low capacity. The leakage current
can be calculated approximately as follows (at 400 V mains voltage):
I = n x 20 mA + L x 1 mA/m at 8 kHz clock frequency at the output

abl
stage
I = n x 20 mA + L x 2 mA/m at 16 kHz clock frequency at the output

abl
stage
I = leakage current, n = number of servo amplifiers, L = length of mo-
abl
tor cable
With other mains voltages, the leakage current will vary in proportion to
the voltage.
Example: 2 x servo amplifiers + 25 m motor cable at 8 kHz clock fre-
quency:
2 x 20 mA + 25 m x 1 mA/m = 65 mA leakage current.
INFORMATION
The leakage current to PE is more than 3.5 mA. In accordance
with EN 61800-5-1, the PE connection must either be duplicated
or a connection cable with a cross section > 10 mm² must be
used. Use the PE terminal and PE bolt.
The following measures can be taken to minimise leakage currents:
Reduce the length of the motor cable

Use lower capacity cables (see section entitled "Connection cables")

Remove external EMC filters (interference suppression measures are

integrated within the servo amplifier)
In accordance with DIN IEC 60364-4-41 - Electrical Installations of
Buildings - and EN 60204 - Electrical Equipment of Machines - it is pos-
sible to use residual current devices (hereafter called FI), if the necessary
provisions are met.
The servo amplifiers constitute a 3-phase system with a B6 bridge. Uni-
versal current sensitive FIs must be used to enable any potential DC fault
current to be detected.