Pilz PMCprotego D.72/000/0/0/2/208-480VAC - Manual (Page 115)

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected]
6-7
6.3 Notes on wiring
6 Wiring
The ready-made cables from Pilz are low capacity. The leakage current
can be calculated approximately as follows (at 400 V mains voltage):
 I
abl
= n x 20 mA + L x 1 mA/m at 8 kHz clock frequency at the output
stage
 I
abl
= n x 20 mA + L x 2 mA/m at 16 kHz clock frequency at the output
stage
I
abl
= leakage current, n = number of servo amplifiers, L = length of mo-
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.
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)
6.3.1.2 Residual current devices FI
Residual current devices FI 6- ][Verdr_FI
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.
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.