Pressure Exchanger; Fault Finding; Bms Hs And Bmst - Grundfos BMS Series Service Instructions Manual
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7. Pressure exchanger
The pressure exchanger requires no maintenance.
Warning
The water flow through the pressure exchanger
must not exceed rated flow.
See the pressure exchanger nameplate.
Warning
If you detect an abnormal sound, do not
dismantle the unit. This action can void the
warranty. Instead, call Grundfos Service.
You find information about the pressure exchanger on this
website: http://www.energyrecovery.com.
8. Fault finding
8.1 BMS hs and BMST
Warning
Before starting work on the product, make sure
that the power supply has been switched off and
that it cannot be accidentally switched on.
Fault
1. The pump starts or
stops occasionally
during operation.
2. The pump stops during
operation.
3. The pump runs, but
generates no pressure
and delivers no water.
4. The pump runs at
reduced capacity.
14
Possible cause
a) No water supply.
The low-pressure switch has cut out.
a) The fuses are blown.
b) The frequency converter has tripped.
c) The motor/supply cable is defective.
a) No or insufficient water supply to the pump.
b) The piping system, pump or nozzle is
choked up.
c) The prefilter is choked up.
d) The valves on the discharge side are partly
closed or blocked.
e) The discharge pipe is partly blocked by
impurities.
f)
The pump is partly blocked by impurities.
g) The pump is defective.
h) The prefilter is choked up.
Remedy
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
in the BMS hp, BMS hs
BMS hs startup
installation and operation instructions (publication
number 98567337).
Check all fuses in the control circuit. Replace defective
fuses. After a cut-out, find the cause of a possible short
circuit.
If the fuses are hot when you replace them, check that
the load of the individual phases does not exceed the
motor current during operation. Identify the cause of the
load.
Reset the frequency converter.
Check the motor and cable.
Check that the inlet pressure during operation is at least
1 bar for BMS hs and 2 bar for BMST. If so, the water
supply is OK. Stop and vent the system.
Restart the pump as described in sections
and
startup,
BMS hp startup
Startup
BMS hs installation and operation instructions
(publication number 98567337). Check the functioning
of the pump.
Check the piping system, pump and nozzle.
Clean the prefilter.
Check the valves.
Clean or replace the discharge pipe. Measure the
discharge pressure, and compare the value with the
calculated data. See the "Technical specifications"
supplied with the system.
Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace any defective parts.
Pull the pump out of the sleeve. Dismantle, clean and
check the pump. Replace any defective parts.
Clean the prefilter.
BMS hs
in the BMS hp,
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