REXROTH RD 500 Series, Applications Manual

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6-2
Electrical Installation of Inverter RD 500 RD51
DOK-RD500*RD51*******-IB04-EN-P
All variable-speed motors should be connected using shielded cables,
whereby the shield is connected at both ends to the housings through the
largest possible surface area to minimize the inductance. The motor
feeder cables should also be shielded outside the cabinet, or at least
screened using barriers.
Cables with steel shields are not suitable.
To connect the shield at the motor, a suitable PG gland with shield
connection can be used (e.g. “SKINDICHT SHV/SRE/E” from the Lapp
Company, Stuttgart). It should be ensured that the connection between
the motor terminal box and the motor housing has a low impedance.
Otherwise, use an additional grounding strap between them. Never use
plastic motor terminal boxes!
The shield between the motor and the frequency converter may not be
interrupted by installing components such as output reactors, sinusoidal
filters, motor filters, fuses, contactors, etc. The components must be
mounted on mounting panels which also simultaneously serve as the
shield connection for the incoming and outgoing motor cables. Metal
barriers may be required to shield the components.
6.2 Warnings and Notes
DANGER
Death by electrocution possible due to live
parts with more than 50 V!
⇒
RD 500 devices are operated at high voltage levels. All
work must be carried out when they are not under
power!
⇒
All work must be carried out only by qualified
personnel!
⇒
If this warning information is not observed, death,
ü ü Ü
ü ü
⇒
Due to the DC link capacitors, the device is still under
a dangerous voltage up to 30 minutes after power
has been switched off. This means that it is only
permissible to work on the device or the DC link
terminals after an appropriate time and after a
careful check has been made to ensure that the
equipment really is not under power.
⇒
The power and control terminals may be live even if
the motor is at a standstill.
⇒
In the case of a central supply of the DC link voltage,
ensure that the inverter is safely separated from the
DC link voltage!
⇒
When working on an open device, note that live parts
are exposed.
⇒
The user is responsible for ensuring that all devices
are set up and connected according to the
recognized technical regulations in the country of use
as well as other regionally valid regulations. Cable
dimensioning, fuse protection, grounding, switching
off, separation and protection from excess currents
must be especially taken into account.
Rule 9
Rule 10