7
ELECTRICAL CONNECTIONS
— Before starting work on the
pump, make sure that the pump
is isolated from the power supply
and cannot be energized.
— If the pump is equipped with
automatic level control, there is
a risk of sudden restart.
— All electrical equipment must be
earthed. This applies to both
pump equipment and any
monitoring equipment.
Failure to heed this warning may
cause a lethal accident. Make sure
that the earth lead is correctly
connected by testing it.
— If persons are likely to come into
physical contact with the pump or
pumped media (liquid), e.g on con-
struction sites and farms, the
earthed (grounded) socket must
have an additional earth-(ground-)
fault protection device (GFI)
connected.
When pumping near a lake (jetties,
beaches, ponds, fountains etc)
a safety-distance of at least 20 m
(65 ft) between the person and the
pump is applicable.
The pump must never be placed
directly into a swimming pool. If
used in connection with swimming
pools, special safety regulations
apply.
NOTE for Ex version
— Electrical connections on the
explosion-proof motor must be
made by authorized personnel.
Flygt disclaims all responsibility
for work done by untrained, un-
authorized personnel.
— The pump may be used only in
accordance with the approved
motor data stated on the pump’s
plates.
— Thermal contacts must be
connected to protection circuit
intended for that purpose
according to the approval of the
product.
All electrical work shall be carried out under the super-
vision of an authorized electrician.
Local codes and regulations shall be complied with.
Check on the data plate which voltage supply is valid
for your pump.
Check that the main voltage and frequency agree with
the specifications on the pump data plate.
If the pump can be connected to different voltages, the
connected voltage is specified by a yellow sticker.
Connect the motor cable to the starter equipment as
illustrated in the cable charts.
Conductors that are not in use must be isolated.
The cable should be replaced if the outer sheath is
damaged. Contact a Flygt service shop.
Make sure that the cable does not have any sharp
bends and is not pinched.
Under no circumstances may the starter equipment be
installed in the sump.
NOTE! For safety reasons, the earth conductor
should be approx. 50 mm (2.0") longer than the phase
conductors. If the motor cable is jerked loose by
mistake, the earth conductor should be the last
conductor to come loose from its terminal. This
applies to both ends of the cable.
Thermal contacts are incorporated in the stator. The
thermal contacts can be connected to max 250 V,
breaking current max 4 A. Flygt recommends that they
be connected to 24 V over separate fuses to protect
the other automatic equipment.
Make sure that the pump is correctly earthed (grounded).
When using a variable-frequency-drive (VFD) the
shielded cable (type NSSHÖU.../3E+St) should be
used. Contact your Flygt representative and ask your
VFD-supplier for electrical limitations.
