Richter RMA-B Series (ASME) - Manual (Page 13)

Series RMA-B close-coupled design Page 13
9475-055-en Revision 14
TM 8256 Edition 06/2011
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 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 chopper
disk 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.