Electrical Installation; Supply Cable; Motor Protection; Electrical Connection - Biral BM 1 Montage- Und Betriebsanleitung

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7. Electrical installation

The electrical connection must be
carried out in accordance with local
regulations.
Before starting work on the pump,
make sure that the electricity supply
has been switched off and that
it cannot be accidentally switched on.
Check that the mains voltage and frequency
correspond to the values on the motor nameplate.

7.1 Supply cable

In order to comply with the EN 60335-1 standard,
the supply cable must as minimum be rated for an
operating temperature of +105 °C (+221 °F).

7.2 Motor protection

Single-phase motors have built-in current and
temperature-dependent motor protection in accordance
with IEC 60034-11 and require no further motor
protection. The motor protection is of the TP 211
type, which reacts to both slow- and quickrising
temperatures. The motor protection is automatically
reset.
Three-phase motors up to 3 kW must be connected
to a motor-protective circuit breaker which can be
manually reset. Set the motor-protective circuit
breaker according to the rated current of the motor
(I1/1). See nameplate.
Motors with power ratings of 3 kW and up have builtin
thermistors (PTC). The thermistors are designed
according to DIN 44082. The motor protection
is of the TP 211 type, which reacts to both slow-
and quick-rising temperatures.

7.3 Electrical connection

Carry out the electrical connection as shown
in the diagram inside the terminal box cover.
Fig. 4: Wiring diagram

7.4 Frequency converter operation

All three-phase motors can be connected to a frequency
converter.
Depending on the frequency converter type, this may
cause increased acoustic noise from the motor.
Furthermore, it may cause the motor to be exposed
to detrimental voltage peaks.
Caution
MG 71- and MG 80-based motors
have no phase insulation and must
therefore be protected against voltage
peaks higher than 650 V (peak value)
between the supply terminals.
The above disturbances, i.e. both increased acoustic
noise and detrimental voltage peaks, can be eliminated
by fitting an LC filter between the frequency converter
and the motor.
For further information, please contact the frequency
converter supplier.
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