Grundfos SP Safety Instructions And Other Important Information page 6

Liquid temperatures and motor cooling
In cases where the stated flow velocity cannot be ach-
ieved, a flow sleeve must be installed.
Flow velocity formula
For 37 kW MMS6 (only PVC windings), 110 kW MMS8000
and 170 kW MMS10000, the maximum liquid temperature
is 5 °C lower than the values stated in the above table.
For 190 kW MMS10000, 220-250 kW MMS12000/50 Hz
and MMS12000/60 Hz, the temperature is 10 °C lower.
Pipe connection
Plastic pipes are recommended for 4" pumps only.
WARNING
Hot liquid
Death or serious personal injury
‐
Use pipes designed for the maximum pump pressure
plus 10 % to avoid pipe burst.
‐
Make sure that the plastic pipes are suitable for the
actual liquid temperature.
Electrical connection
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 cannot be accidental-
ly switched on.
DANGER
Electric shock
Death or serious personal injury
‐
The pump must be earthed.
‐
The pump must be connected to an external main
switch and shall be provided with a means permitting it
to be locked in the OFF (isolated) position. Type and
requirements as specified in EN 60204-1, 5.3.2
The electrical connection must be carried out by an au-
thorised person in accordance with local regulations.
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 cannot be accidental-
ly switched on.
DANGER
Electric shock
Death or serious personal injury
‐
The pump must be connected to protective earth.
‐
Switch off the power supply before starting any work
on the product.
‐
Make sure that the power supply cannot be accidental-
ly switched on.
Required settings of motor-protective circuit breaker
If this requirement is not met, the motor warranty will be
invalidated.
6
Cable sizing
Submersible motor cables are dimensioned for submer-
sion in liquid, and will not necessarily have sufficient
cross-section to be in free air.
Control of single-phase MS402 motors
The single-phase MS402 motors smaller than 1.1 kW in-
corporate motor protection which cuts out the motor in
case of excessive winding temperatures while the motor is
still supplied with voltage. Allow for this, when the motor
forms part of a control system.
Checking the direction of rotation
The pump must not be started until the suction intercon-
nector has been completely submerged in the liquid.
Frequency converter operation
During frequency converter operation, it is not advisable to
run the motor at a frequency higher than the rated fre-
quency (50 or 60 Hz). In connection with pump operation,
it is important never to reduce the frequency (and conse-
quently the speed) to such a level that the necessary flow
of cooling liquid past the motor is no longer ensured.
To enable the monitoring of the motor temperature,
Grundfos recommend that Pt100 or Pt1000 sensor is in-
stalled.
If an MS motor with temperature transmitter is connected
to a frequency converter, a fuse incorporated in the trans-
mitter will melt and the transmitter will be inactive. The
transmitter cannot be reactivated. This means that the
motor will operate like a motor without a temperature
transmitter.
Mechanical installation
WARNING
Sharp element
Death or serious personal injury
‐
When mounting the facilitating pipe, wear personal
protective equipment to avoid cutting on sharp edges
on the pump.
Be careful not to ben or damage long pump sets, when
moving them from horizontal to vertical positions.
Removing and fitting the cable guard
Make sure that the pump chambers are aligned when the
cable guard has been fitted.
Riser pipe
WARNING
Sharp element
Death or serious personal injury
‐
When mounting the riser pipe, wear personal protec-
tive equipment to avoid cutting on sharp edges on the
pump.
Plastic pipes are recommended for 4" pumps only.