Grundfos MS Serie Instrucciones De Seguridad página 7

Single-phase motors
DANGER
Electric shock
Death or serious personal injury
‐
Switch off the power supply before
starting any work on the product.
‐
Make sure that the power supply can-
not be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
‐
The pump must be connected to pro-
tective earth.
‐
Switch off the power supply before
starting any work on the product.
‐
Make sure that the power supply can-
not be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
‐
When the motor has been thermally
switched off, the motor terminals are
still live. When the motor has cooled
sufficiently, it will restart automatically.
Required settings of the motor-protective circuit
breaker
If this requirement is not met, the motor
warranty will be invalidated.
Cable sizing
Submersible motor cables are dimen-
sioned for submersion in the liquid, and
will not necessarily have sufficient cross-
section to be in the air.
Control of single-phase MS402
Single-phase MS402 submersible motors
below 1.1 kW incorporate motor protection
that cuts out the motor in case of exces-
sive winding temperatures while the motor
is still supplied with voltage. Allow for this
when the motor forms part of a control sys-
tem.
Checking the direction of rotation of the pump set
The pump must not be started until the
suction interconnector has been complete-
ly submerged in the liquid.
Frequency converter
During frequency converter operation, it is
not advisable to run the motor at a fre-
quency higher than the rated frequency
(50 or 60 Hz). In connection with pump op-
eration, it is important never to reduce the
frequency (and consequently the speed) to
such a level that the necessary flow of
cooling liquid past the motor is no longer
ensured.
To enable monitoring of the motor temper-
ature, Grundfos recommends that a Pt100
or a Pt1000 be installed.
Motor installation
DANGER
Electric shock
Death or serious personal injury
‐
Switch off the power supply before
starting any work on the product.
‐
Make sure that the power supply can-
not be accidentally switched on.
DANGER
Electric shock
Death or serious personal injury
‐
Make sure that motor cable ends are
not live before starting any work on the
product.
‐
Make sure that the power supply can-
not be accidentally switched on.
In case of unintended flow of water through a non-
energized pump, there is a risk that the moving parts
of the pump and the motor will start rotating, thereby
generating voltage over the terminals. The size of the
voltage depends on the speed of rotation.
Consequently, the motor terminals must be
considered as live until proven otherwise.
Removing and fitting the cable guard
Once the cable guard is fitted, make sure
that the pump chambers are aligned.
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