Inlet Conditions; Electrical Connection - Grundfos MTC Serie Instrucciones De Instalación Y Funcionamiento

3.2 Inlet conditions

The bottom of the pump strainer must be at least
0.98" (25 mm) above the bottom of the tank. See fig.
6 or 7.
MTC pumps must be installed vertically and the drain
hole in the motor stool must have access to the tank.
The pumps are designed to provide full performance
down to a level of A above the bottom of the strainer.
At a liquid level between A and B above the bottom
of the strainer, the built-in priming screw will protect
the pump against dry running.
Pump type
[inch (mm)]
MTC 2, 4 and 8 1.46 (37)
MTC 10 and 15 1.57 (40)
Fig. 6 MTC 2, 4 and 8
Fig. 7 MTC 10 and 15
A B
[inch (mm)]
0.98 (25)
1.10 (28)
A
B
0.98"(25mm)
A
B
0.98"(25mm)

3.3 Electrical connection

WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the
product, make sure that the power
supply has been switched off and that it
cannot be accidentally switched on.
Connect the pump to an external main
switch close to the pump and to a
motor-protective circuit breaker or a
CUE frequency converter.
- Make sure you can lock the main switch
in OFF position (isolated). Type and
requirements as specified in EN 60204-
1, 5.3.2.
Operating voltage and operating frequency are
stated on the motor nameplate. Check that the motor
is suitable for the power supply available at the
installation site.
The voltage quality for ML motors, measured at the
motor terminals, must be ± 10 % of the rated voltage
during continuous operation, including variation in
the supply voltage and losses in cables.
The electrical installation must be carried out by
authorised personsin accordance with local
regulations.
The wiring diagram is located in the terminal box
cover.
ML motors can be connected in star (Y), parallel star
(YY), delta (D) or parallel delta (DD). See the wiring
diagram in the terminal box cover.
Voltage and connection are stated on the nameplate.
Example: 208-230 V YY / 460 Y
• If the voltage supply is 208-230 V, the motor must
be connected in parallel star.
• If the voltage supply is 460 V, the motor must be
connected in star.
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