Retsch PP 40 - Manual (Page 12)

08.02.2012 Retsch GmbH
12
0002
Important instructions for electrical connection
1. Electrical connection without a protective conductor PE is not
permissible.
2. The drive of your PP40 is fitted with a frequency converter. To
fulfill the EMC directive this is fitted with a line filter and shielded
cables to the motor.
If your mains connection for the PP40 includes a fault-current
protective system, fault throwing may result through the anti-
interference wiring of the frequency converter when this is
switched on (switching on takes place each time the pressing
chamber hood is closed).
This can occur without there being a fault on your PP40 or your
mains installation.
According to state of the art selective a.c.-d.c. sensitive fault-
current protective systems are recommended for such cases. The
tripping current must be adequately dimensioned since
capacitive compensating currents occurring only for a short time
(shielded cables, line filter) when switching on can easily cause
fault throwing.
Under certain circumstances it may be necessary to operate the
PP40 without a fault-current protective system. In this case,
however, it should be checked whether this is inconsistent with
the local regulations of the electricity supply company or other
applicable institutions or standards.
If the values on the type plate are not observed this can
result in damage to the electrical and mechanical
components.
Serial interfaces
Inactive interface Sc for optional data communication
with an external device. This necessitates updating of
the software.
(Fig. 3 Serial interface)
The interface cables must not be longer than 2.5 m.
Longer cables can cause disturbances during transmission of
data.
Sc
Fig. 3 Serial interface