Troubleshooting - KNF LABORPORT Originalbetriebsanleitung

Troubleshooting

Pump not delivering
Cause
No voltage in the elec-
trical mains.
Overtemperature pro-
tection of the pump has
tripped
Connections or lines
are blocked.
External valve is closed
or filter is clogged.
Condensate has col-
lected in the pump
head.
Diaphragms or valve
plates/seals are worn.
46
Chemically-resistant Laboratory pump N820.18
12 Troubleshooting
DANGER
à
Check the pump (see following tables).
Troubleshooting
à
Check the circuit breaker for the room and switch it
on if necessary.
à
Disconnect the pump from the electrical mains.
à
Allow the pump to cool.
à
Determine the cause of the overheating and rectify.
à
Check the connections and lines.
à
Remove the blockage.
à
Check external valves and filters.
à
Separate the source of the condensate from the
pump.
à
Flush the pump with air at atmospheric pressure for
a few minutes (if necessary for safety reasons: with
an inert gas).
à
Replace the diaphragms and the valve plates/seals
(see Chapter Replacing diaphragm and valve
plates).
Tab.21: Troubleshooting: Pump not delivering
Translation of Original Operating Instruction, English, KNF
Danger to life from electric shock
à
All work on the pump may only be
performed by an authorized spe-
cialist.
à
Disconnect the pump power supply
before working on the pump.
à
Check and ensure that no voltage
is present.
317428-317425 09/20
EX