Retsch PM 400 - Manual (Page 12)

08.02.2012 Retsch GmbH
12
Doc. Nr. GB 98.535.9999
Important instructions:
1. Electrical connection without a protective conductor PE is not
permissible.
2. The drive of your PM400 is fitted with a frequency converter. To
fulfil the EMC directive this is fitted with a line filter and shielded
cables to the motor. If your PM400 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 milling
chamber hood is closed). This can occur without there being a
fault on your PM400 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 occuring 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
PM400 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
RS 485 – inactive interface Sc 1 for optional data
communication with an external device. This
necessitates updating of the softwear.
RS 232 - interface Sc 2 for updating the softwear.
The interface cables must not be longer than 2.5 m.
Longer cables can cause disturbances during transmission of
data.
Sc 1
Sc 2