Motor Protection; Generator Operation; Start-Up; Operation - Grundfos BMP Serie Instrucciones De Instalación Y Funcionamiento

8.2 Motor protection

The pump must be connected to an effective motor starter which
must protect the motor against damage from voltage drop, phase
failure, overload and a locked rotor.
8.2.1 Setting of motor starter
For cold motors, the tripping time for the motor starter must be
less than 10 seconds at 5 times the rated full-load current of the
motor.
To ensure the best protection of the motor, the setting of the mo-
tor starter should be carried out as follows:
1. Set the starter overload to the rated full-load current (I
motor.
2. Start the pump and let it run for half an hour at normal perform-
ance.
3. Slowly grade down the scale indicator until the motor starter
trips out.
4. Increase the overload setting by 5%, but not higher than the
full-load current (I ).
N
For motors wound for star-delta starting, the starter overload unit
should be set as described above, but the maximum setting must
not exceed the following:
Starter overload setting = Rated full-load current (I
In the case of frequency converter operation, follow the manufac-
turer's instructions.

8.3 Generator operation

In the case of generator operation, contact Grundfos.

9. Start-up

Before the pump is installed in the piping system, this should be
flushed through with clean water to remove possible impurities
from pipes, hoses, etc.
1. Venting: Before starting the pump, slacken the vent plugs "A",
see fig. 4. When the water starts running out of the holes, the
pump has been filled with water. Retighten the plugs.
2. Direction of rotation: Start the pump (for 1 sec. only) and
check the direction of rotation. The correct direction of rotation
is stated on the pump nameplate. If necessary, interchange
any two of the incoming supply wires.
Note: The pump must not run dry.
3. Water supply: When the suction pipe has been connected to
the water supply or tank, start the pump with an open dis-
charge port (O).
4. Prefilter: It is recommended to replace the filter element after
1 to 10 hours of operation after the first start-up.
A
Fig. 4 Vent plugs

10. Operation

During operation the pump must always be connected to the
water supply.
Note: Dry running will damage the pump.

10.1 Operation settings

The flow and discharge pressure of the pump should always be
kept within the ranges for which the system was originally de-
signed.
If the system requires flows and pressures outside the design
range, please contact Grundfos.
8
) of the
N
) x 0.58.
N
A
A

11. Checking of operation

Check the following at suitable intervals:
• Flow and pressure.
• Current consumption.
• Pressure drop over the prefilter.
Replace the filter element when "clogged filter" is indicated.
• Whether the motor ball bearings are worn.
• Whether the shaft seal is leaky.
The shaft seal is lubricated by the pumped liquid. Small quan-
tities of liquid are therefore drained via the drain hole in the
coupling housing.
• Whether the noise level has changed.
It is recommended to write the operating data in the log book sup-
plied with the pump. The data can be useful for maintenance pur-
pose.

12. Maintenance

The BMP pump requires no periodic maintenance.
It is recommended to inspect the pump once a year.

13. Motor bearings

Under optimum operating conditions, the operating life of the mo-
tor ball bearings is approx. 20,000 operating hours. After that pe-
riod, the bearings must be replaced. The new bearings must be
filled with grease.
Grease type, see motor nameplate.

14. Automatic monitoring devices

14.1 Level switch

Systems supplied from a water tank must be fitted with a level
switch which switches off the electricity supply to the pump if the
water level gets too low.

14.2 Thermal sensor

It is recommended to install a thermal sensor which switches off
the electricity supply to the pump if the water temperature ex-
ceeds 50°C (122°F).

15. Periods of inactivity

In the case of periods of inactivity exceeding
• 1 month for BMP and BMP-N and
• 6 hours for BMP-R,
it is important to flush the system through with clean fresh water.
Note: Fill the pump with Grundfos motor liquid, type SML-2, in
periods of inactivity exceeding 1 month.

15.1 Flushing of pump

Disconnect the suction pipe from the water supply. The pump will
be emptied through the suction pipe.
When the pump is to be started again, the venting procedure in
section 9. Start-up must be followed carefully.
The pump must run during the flushing procedure.
Flushing can for instance be effected through small quick-cou-
plings or gate valves (not supplied with the pump) fitted either
side of the pump.
Flush the pump for at least 2 minutes.

15.2 Transport and storage

Note: During transportation and storage, the BMP pump must
never be preserved with liquids which are aggressive to the pump
materials.
In periods of inactivity exceeding one month, fill the pump with
Grundfos motor liquid, type SML-2, to prevent corrosion. This liq-
uid is frost-proof down to –20°C.
Note: Never just drain the pump!
For further information on anti-freeze liquids, please contact
Grundfos.