Fault Finding The Product; Service Documentation - Grundfos BM Installations- Und Bedienungsanleitungen

13. Fault finding the product

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.
Fault Cause
1. The booster system a) No or insufficient water supply. The
stops occasionally.
One or more
modules stop.
b) The capacity is too small. The flow switch
2. The booster system a) The fuses are blown.
does not run.
b) The motor-protective circuit breaker has
c) The magnetic coil of motor-protective
d) The control circuit has cut out or is
e) The motor/supply cable is defective.
3. The booster system a) No water or too small quantity delivered to
runs, but gives no
water or develops no
pressure.
b) Inlet parts are blocked.
4. The booster system a) Wrong direction of rotation.
runs at reduced
b) The valves on the outlet side are partly
capacity (flow rate
and pressure).
c) The outlet pipe is partly blocked by
d) The module is partly blocked by impurities. Pull the pump out of the sleeve. Dismantle, clean and check
e) The module is defective.

14. Service documentation

Service documentation is available in Grundfos Product Center:
http://product-selection.grundfos.com/.
If you have any questions, please contact the nearest Grundfos
company or service workshop.
pressure switch has cut out.
has cut out.
tripped.
circuit breaker/contactor is short-circuited
(not cutting in).
defective.
the modules or air in the system.
closed or blocked.
impurities.
Remedy
Check that the pressure switch functions normally (without
delay) and is adjusted correctly. Check that the minimum
inlet pressure is correct.
The outlet pipe is totally or partly blocked due to incorrectly
adjusted manually operated valve or failure in the magnetic
or motor-operated valve.
Check these valves.
The flow switch is faulty or incorrectly adjusted.
Check/adjust the switch.
Check and replace both main fuses and/or fuses for the
control circuit.
Reset the motor-protective circuit breaker. If it trips again,
the voltage must be checked.
Replace the coil. Check the coil voltage.
Check the control circuit and the contacts in the monitoring
devices (pressure switch, flow switch, etc.).
Check motor and cable. See also section
motor and cable.
Check that the inlet pressure during operation is at least 0.5
bar for BM 4" and BM/BMhp 6", and 1 bar for BM/BMhp 8".
If this is the case, the water supply is OK. Stop and vent the
system. Restart the system as described in section
10. Operation.
If the module is defective, it must be dismantled and
repaired or replaced.
Pull the pump out of the sleeve, and clean the inlet parts.
See section 9. Before starting the booster
Check valves.
Measure the outlet pressure and compare with the
calculated data. Clean or replace the outlet pipe.
the pump. Replace defective parts. Clean the pipes.
Pull the pump out of the sleeve. Dismantle, clean and check
the pump. Replace defective parts. See section
documentation.
15. Checking of
module(s).
14. Service
13