Richter RMA Series - Manual (Page 13)

Series RMA
Page 13
9475-050-en Revision 12
TM 7978 Edition 08/2010
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
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, but
meet requirements acc. to ANSI/HI respec. ISO 5199.
During start-up the magnetic drive could otherwise
stop.
The magnetic drive rating at nominal speed 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.
Observe the operating manual of the motor
manufacturer.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
5.8 Coupling
If one coupling half engages with the other, the claw
section is normally to be mounted on the drive shaft
and the coupling half with the smooth end face on the
motor shaft.
Observe the operating manual of the coupling
manufacturer.
A coupling with a valid ATEX certificate is to
be used if deployed in zone 1 and 2.
Regulations exist, e.g. for the following details:
Arrangement of the coupling halves
Max. bore diameter
Max. transmitted power
Spacing of the coupling halves
Maximum values for offset and angular
misalignment.
Should the pump housing and motor remain on the
base plate for repair work, a spacer type coupling is
required.
5.9 Final check
Check the alignment of the coupling again in
accordance with Section 5.3.
It must be possible to easily turn the unit at the
coupling by hand.
5.10 Coupling guard
The pump may only be operated with a coupling
guard in accordance with the accident prevention
regulations.
It must be ensured that the coupling guard
used is either made of spark-free material or
the impact test required by the EN 13463 is
satisfied without any reservations.
Richter offers both versions.
The operator must ensure that, after the coupling
protection has been mounted, the requirements of
the machine guideline are fulfilled.
5.11 Electric connection
The operator is obligated to connect the assembly in
accordance with existing regulations 8 (IEC, VDE,
etc.).
Allow only a trained electrician to perform
the electrical connection.
Compare the existing mains voltage with
the indications on the motor’s manufacturer’s
nameplate and choose a suitable circuit.
A motor protection device (motor-circuit switch) is
urgently recommended.
Danger of explosion if the electrical
installation is incorrect.
In areas at risk of explosion, IEC 60079-14
must also be observed for the electrical
installation.
If the pump is mounted on a base plate, ensuring
electrical conduction through the use of a toothed
lock washer or contact disk on the housing foot and
support bracket.
The assembly must be grounded in accordance with
currently effective regulations, for example, on the
base plate.