Inhaltsverzeichnis
Werbung
Fig. 5
If the pump is installed horizontally, e.g. in a tank, it is recom-
mended to fit it in a flow sleeve.
3.2.1 Motors suitable for horizontal installation
Power output
Motor type
MS 6000
MMS 6000
MMS 8000
MMS 10000
75.0 to 110.0
MMS 12000
147.0 to 190.0
Note: During operation, the suction interconnector of the pump
must always be completely submerged in the liquid.
In special conditions, it may be necessary to submerge the pump
even deeper, depending on the operating conditions of the actual
pump and the NPSH value.
If the pump is used for pumping hot liquids (40° to
60°C), care should be taken to ensure that persons
cannot come into contact with the pump and the in-
stallation, e.g. by installing a guard.
3.3 Diameter of pump/motor
The maximum diameter of the pump/motor is as shown in the ta-
ble on page 98.
It is recommended to check the borehole with an inside calliper to
ensure unobstructed passage.
3.4 Liquid temperatures/cooling
The maximum liquid temperature and the minimum liquid velocity
over the motor appear from the following table.
It is recommended to install the motor above the well screen in
order to achieve proper motor cooling.
Note: In cases where the stated liquid velocity cannot be
achieved, a flow sleeve must be installed.
If there is a risk of sediment build-up, such as sand, around the
motor, a flow sleeve should be used in order to ensure proper
cooling of the motor.
3.4.1 Maximum liquid temperature
Out of consideration for the rubber parts in pump and motor, the
liquid temperature must not exceed 40°C (~105°F). See also the
following table.
The pump can operate at liquid temperatures between 40°C and
60°C (~105°F and 140°F) provided that all rubber parts are re-
placed every third year.
80
Allowed
Not allowed
Power output
50 Hz
60 Hz
[kW]
[kW]
All sizes
All sizes
3.7 to 18.5
3.7 to 18.5
22.0 to 55.0
22.0 to 55.0
75.0 to 110.0
–
Motor
Flow past
the motor
Free
Grundfos
convection
MS and MMS
0 m/s
Grundfos
0.15 m/s
MS
Grundfos
0.15 m/s
MMS
Note: By free convection is meant that the borehole diameter is
at least 2" larger than the diameter of the submersible motor.
Other motor makes: See motor specifications.
4. Electrical connection
Before starting work on the pump, make sure that the
electricity supply has been switched off and that it
cannot be accidentally switched on.
4.1 General
The electrical connection should be carried out by an authorized
electrician in accordance with local regulations.
The supply voltage, rated maximum current and cos Ó appear
from the loose data plate that must be fitted close to the installa-
tion site.
The required voltage quality for Grundfos MS submersible mo-
tors, measured at the motor terminals, is –10%/+6% of the nomi-
nal voltage during continuous operation (including variation in the
supply voltage and losses in cables).
The required voltage quality for Grundfos MMS submersible mo-
tors, measured at the motor terminals, is –5%/+5% of the nominal
voltage during continuous operation (including variation in the
supply voltage and losses in cables).
Furthermore, it must be checked that there is voltage symmetry in
the electricity supply lines, i.e. same difference of voltage be-
tween the individual phases, see also section 9. Checking of mo-
tor and cable , point 2.
The pump must be earthed.
The pump must be connected to an external mains
switch.
In order that the Grundfos MS motors with a built-in and opera-
tional temperature transmitter can meet the EC EMC Directive
(89/336/EEC), a 0.47 ÉF capacitor (in accordance with IEC 384-
14) must always be connected over the two phases to which the
temperature transmitter is connected, see fig. 6.
Installation
Vertical
Horizontal
20°C
Flow sleeve
(~68°F)
recommended
40°C
40°C
(~105°F)
(~105°F)
25°C
25°C
(~77°F)
(~77°F)
Werbung
Kapitel
Inhaltsverzeichnis
