English (GB)
16
21. Fault finding
Warning
Before starting work on the booster module, make sure that the power supply has been switched off and that it
cannot be accidentally switched on.
Fault
Possible cause
Remedy
1. The booster module
starts/stops
occasionally during
operation.
a) No water supply.
The low-pressure switch has cut out.
Check that the low-pressure switch functions normally
and is adjusted correctly. Check that the minimum inlet
pressure is correct. If not, check the feed pump. See
section
b) The lubricating oil level is too low.
Check that the oil level switch functions normally. If it is
OK, check the oil system for leakage. See section
2. The booster module
stops during operation.
a) The fuses are blown.
After a cut-out, the cause of a possible short-circuit
must be found.
If the fuses are blown, check whether the motor starter
has been set correctly or is faulty.
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, the
cause of a possible short-circuit must be identified.
Possible fuses in the control circuit must be checked
and defective fuses must be replaced.
b) The motor starter overload unit has tripped.
Reset the starter overload. See also sections
and
7. Before starting the booster module
.
c) The magnetic coil of motor starter/contactor
is defective (not cutting in).
Replace the coil. Check the coil voltage.
d) The control circuit has cut out or is defective. Check the control circuit and the contacts in the
monitoring devices (low-pressure switch, flow switch,
etc.).
e) The motor/supply cable is defective.
Check motor and cable. See section
.
3. The booster module
runs, but gives no
water or develops any
pressure.
a) No or insufficient water supply at the module
inlet.
Check that the inlet pressure during operation is at least
1 bar for BME and 2 bar for BMET. See sections
and
.
Restart the booster module as described in section
.
Check the function of the feed pump.
b) The piping system, pump or nozzle is
choked up.
Check the piping system, pump and nozzle.
c) The pre-filter is choked up.
Clean the pre-filter.
4. The booster module
runs at reduced
capacity.
a) Wrong direction of rotation.
See section
9. Liquid filling, venting and checking of
.
b) The valves on the discharge side are partly
closed or blocked.
Check the valves.
c) The discharge pipe is partly blocked by
impurities.
Clean or replace the discharge pipe. Measure the
discharge pressure and compare the value with the
calculated data. See "Technical specification", supplied
with the system.
d) The pump is partly blocked by impurities.
Pull the pump out of the sleeve. Dismantle, clean and
check the pump and module. Replace any defective
parts.
e) The pump is defective.
Pull the pump out of the sleeve. Dismantle, clean and
check the pump and module. Replace any defective
parts.
f)
The pre-filter is choked up.
Clean the pre-filter.
Summary of Contents for BME
Page 1: ...BME BMET Installation and operating instructions GRUNDFOS INSTRUCTIONS ...
Page 2: ...2 ...
Page 132: ...Appendix 132 System sketch ...
Page 133: ...133 ...
