English (GB)
9
Three-phase pumps
The motor is designed so that the phase sequence in
the terminal box is clockwise. This can be
determined with a phase sequence detector. The
pump does not start unless the phase sequence is
correct.
If the dry-running sensors are covered by liquid, and
the pump does not start, the cause may be a wrong
phase sequence. Interchange L1 and L2.
Fig. 3
Wiring diagram for three-phase pumps
3.2.2 Grundfos CIU
CIU stands for "Communication Interface Unit", and
CIU is used as a communication interface between a
DP or EF AUTO
ADAPT
pump and a main data
communication network.
CIU is optional. See separate installation and
operating instructions supplied with the unit.
3.2.3 Alarm relay or communication connection
The pump incorporates an alarm relay output. NC
and NO are available and can be used as required,
for example for acoustic or visual alarms. Maximum
relay load is 230 VAC 2 A.
Alternatively, wires 4 and 6 can be used for external
communication via a CIU.
See example of wiring diagram in the documentation
supplied with CIU.
3.2.4 Supply requirement
The maximum permissible system impedance Zmax
must be 0.24 Ohm at 50 Hz at the interface point of
the user’s supply or the current capacity, which is
100 A per phase, supplied from a distribution
network.
If not, a minor voltage drop may occur, which may
result in a brief flashing of an electric light.
Consult the supply authority, if necessary, to ensure
that the current capacity at the interface point is
sufficient for the equipment.
4. Starting up the product
TM
04
4
298
12
0
9
If a CIU is connected, do not use a relay.
CIU incorporates a relay which takes over
the alarm function.
CAUTION
Crushing of hands
Minor or moderate personal injury
- Do not put your hands or any tool into
the pump inlet or outlet port after the
pump has been connected to the power
supply, unless the pump has been
switched off by removing the fuses or
switching off the main switch.
- Make sure that the power supply cannot
be accidentally switched on.
Before starting the product:
- Make sure that the fuses have been
removed.
- Make sure that all protective equipment
has been connected correctly.
CAUTION
Biological hazard
Minor or moderate personal injury
- Make sure to seal the pump outlet
properly when fitting the outlet pipe
otherwise water might spray out of the
sealing.
WARNING
Crushing of hands
Death or serious personal injury
- When lifting the pump, make sure your
hand is not caught between the lifting
bracket and the hook.
DANGER
Crushing hazard
Death or serious personal injury
- Make sure that the hook is fixed
properly to the lifting bracket.
- Always lift the pump by its lifting bracket
or by means of a forklift truck if the
pump is fixed on a pallet.
- Never lift the pump by means of the
power cable, hose or pipe.
- Make sure that the lifting bracket is
tightened before attempting to lift the
pump. Tighten if necessary.
