Grundfos BMS Series - BMS Hp

12.2 BMS hp
DANGER
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.
WARNING
Description of hazard
Death or serious personal injury
‐ Make sure that the coupling guard is mounted correctly before start.
Related information
6. Electrical connection
12.2.1 The pump stops occasionally during operation
Cause Remedy
No or insufficient water supply. The pressure switch has cut out. Check that the pressure switch functions normally, without delay, and is
adjusted correctly. Check that the minimum inlet pressure is correct.
The capacity is too small. The flow switch has cut out. The outlet pipe is totally or partly blocked due to incorrect adjustment
of a manually operated valve or failure in the solenoid valve or the
motor-operated valve. Check these valves.
The flow switch is faulty or incorrectly adjusted. Check or adjust the
switch.
12.2.2 The pump does not run
Cause Remedy
The fuses are blown. After a cut-out, the cause of a possible short circuit must be found.
If the fuses are hot when they are replaced, check that the load of the
individual phases does not exceed the motor current during operation.
Identify the cause of the load.
If the fuses are not hot immediately after the cut-out, then identify the
cause of a possible short circuit.
Check all fuses in the control circuit and replace defective fuses.
The frequency converter has tripped. Reset the frequency converter.
The motor or power cable is defective. Check the motor and cable.
Related information
6. Electrical connection
12.2.3
The pump runs, but generates no pressure and delivers no water
Cause Remedy
No or insufficient water supply to the pump or air in the system. Check that the inlet pressure during operation is at least 1 bar. If so,
the water supply is OK. Stop and vent the system. If the BMS hp is a
part of a system, see the section on BMSX system. If the pump is
defective, dismantle and repair or replace it.
The inlet parts are blocked. Pull the pump out of the sleeve and clean the inlet parts.
Related information
7.4.1 Flow control and balancing
12.2.4
The pump runs at reduced performance (flow and pressure)
Cause Remedy
The valves on the outlet side are partly closed or blocked. Check the valves. Put the valves in the correct position and remove all
obstacles.
The outlet pipe is partly blocked by impurities. Measure the outlet pressure and compare the value with the calculated
data. Clean or replace the outlet pipe.
The pump is partly blocked by impurities. Pull the pump out of the sleeve. Dismantle, clean and check the pump.
Replace defective parts.
The pump is defective. Pull the pump out of the sleeve. Dismantle, clean and check the pump.
Replace defective parts.
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English (GB)