Electrical Connection; Starting Up The Product; First Start-Up - Grundfos MTS Serie Montage- Und Betriebsanleitung

3.2 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
that you can lock the main switch in
OFF position (isolated). Type and
requirements as specified in EN
60204-1, 5.3.2.
The user is to consider whether it is
necessary to install an emergency stop
switch.
The operating voltage and frequency are marked on
the motor nameplate. Make sure that the motor is
suitable for the power supply on which it will be used
and the motor terminal connection is correct. You will
find a wiring diagram in the terminal box.
3.2.1 Frequency converter operation
All three-phase motors supplied by Grundfos can be
connected to a frequency converter. The frequency
converter must be set to operation with a constant
torque.
Dependent on the frequency converter type, this may
cause increased acoustic noise from the motor.
Furthermore, it may also cause the motor to be
exposed to detrimental voltage peaks.
Grundfos motors type MG 90 (1.5 kW,
2-pole), for supply voltages up to and
including 440 V (see motor nameplate),
must be protected against voltage peaks
higher than 650 V (peak value) between
the supply terminals.
We recommend to protect all other motors against
voltage peaks higher than 850 V.
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 details, please contact your frequency
converter or motor supplier.
12

4. Starting up the product

WARNING
Too high pressure and leakage
Death or serious personal injury
- Do not run the pump against a closed
outlet valve for more than approx. 5
minutes.
Before starting-up the pump for the first time, make
sure that the following requirements have been
fulfilled:
• The pump is installed properly.
• The motor is installed properly.
• The operational data are according to the data on
the pump nameplate and technical data.
• All plastic covers have been removed.
• All pipe connections are stress-free and sealed.
• All safety equipment is installed and tested for
functionality.
• There is sufficient liquid level in the tank
(minimum immersion depth).

4.1 First start-up

4.1.1 Removing the corrosion inhibitor
Only necessary for pumps treated with corrosion
inhibitor.
See section 6.5 Removing corrosion
4.1.2 Priming
1. Moisten the mechanical shaft seal (only for
pumps with mechanical shaft seals) by removing
the upper screwed plug in the discharge casing
and filling in liquid. Refit the screwed plug (not
necessary for shaft seal ring version).
2. For tank-top and in-tank installations (fig.
fig. 8), observe the minimum immersion depth.
See section 3.1.11 Liquid
3. Open the suction-side valve, if installed.
4. Fill the pump and suction pipe with pumped liquid
until pumped liquid comes out without bubbles.
5. Open the discharge-side valve.
6. Make sure that the discharge piping is not
blocked or leaky.
inhibitor.
7 and
level.