Richter MNK-B Series - Manual (Page 12)

Series MNK-B, close-coupled design Page 12
9230-055-en Revision 09
TM 7345 Edition 10/2008
Fig. 5
5.6 Monitoring facilities
Appropriate monitoring facilities are to be
recommended,
depending on the
requirements placed on operational safety and
availability of the unit.
Richter provides information on request and can
supply:
Flow meters
Filling level indicators
Motor load monitors
Temperature monitors
Can monitors
Leak monitors
CMS "Condition Monitoring System"
You can obtain the publications "Safe Operation of
Magnetic Drive Pumps" and "The Operation of
Centrifugal Pumps without NPSH Problems" on
request.
5.7 Drive
The power consumption of the pump at the operating
design point is specified in the data sheet and works
certificate. If the operating design point was not known
when the pump was dispatched, the power
consumption can be read off the appropriate
performance curves. The max. density, the max.
viscosity and a safety margin are to be allowed for.
Care must be taken when selecting the motor size to
ensure that the excess power is not too great. During
start-up the magnetic drive could otherwise stop.
The magnetic drive rating at the nominal speed of
2900 rpm is given in the pump data sheet.
If the motor rating exceeds this magnetic drive rating –
at nominal speed -, it is necessary to check for any
stoppage of the magnetic drive.
This also applies if the required drive rating exceeds
80% of the magnetic drive rating – at nominal speed.
Consult Richter if necessary.
Different operating data can be achieved without
changing the pump through the use of different
speeds, e.g. by means of a frequency converter.
The pump with base plate and motor is illustrated in
the installation drawing.
The operating manual of the motor manufacturer
must be observed.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
5.8 Electric connection
Only have the electric connection performed
by a qualified electrician. Compare the
available mains voltage with the information
on the type plate of the motor and select a suitable
circuit.
It is urgently recommended to use motor protection
facilities (motor protection switch).
In potentially explosive areas IEC 60079-14
must also be observed for the electrical
installation.
It must be ensured that the pump is grounded
at the housing 100.
This can be achieved in the simplest case by
using of tooth-lock washers or contact discs if the
substructure itself is grounded.
Otherwise, grounding must be ensured by other
means, e.g. cable bridges.
Units supplied by Richter (pump and base plates) are
to be grounded using suitable devices on the base
plate.