Troubleshooting - VWR VP 820 Manual Del Usuario

9.

Troubleshooting

Extreme danger from electrical shock!
 Disconnect the pump power supply before working on the pump.
 Make sure the pump is de-energized and secure.
DANGER
 Check the pump (see Tab. 9 to 12).
Pump produces no flow
Cause
No voltage in the power source
Thermal switch has operated following to over-
heating.
Connections or lines blocked.
External valve is closed or filter is clogged.
Condensate has collected in pump head.
Diaphragm or valve plates/sealings are worn.
Tab. 9
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Condensate has collected in pump head.
There is gauge pressure on pressure side and
at the same time vacuum or a pressure above
atmospheric pressure on suction side.
Pneumatic lines or connection parts have an
insufficient cross section.
Leaks occur on connections, lines or pump
head.
Connections or lines completely or partially
jammed.
Head parts are soiled.
Diaphragm or valve plates/sealings are worn.
After diaphragm and valve plates/sealings
have been replaced
Tab. 10
Fault remedy
 Check room fuse and switch on if necessary.
 Disconnect pump from mains.
 Allow pump to cool.
 Trace cause of over-heating and eliminate it.
 Check connections and lines.
 Remove blockage.
 Check external valves and filters.
 Switch the drying system on or reduce t
(see section 7.4 with regard to changing the value
which has been set).
 Replace diaphragm and valve plates/sealings (see
chapter 8.3).
Fault remedy
 Switch the drying system on or reduce t
(see section 7.4 with regard to changing the value
which has been set)
 Change the pressure conditions.
 Disconnect pump from system to determine output
values.
 Eliminate throttling (e.g. valve) if necessary.
 Use lines or connection parts with larger cross section
if necessary.
 Check that tubes sit correctly on hose nozzles.
 Replace leaky tubes.
 Eliminate leaks.
 Check connections and lines.
 Remove the jamming parts and particles.
 Clean head components.
 Replace diaphragm and valve plates (see chapter 8.3).
 Check that the spacers have been replaced onto the
diaphragm screw thread.
 Check head connection and hose connections for
leaks.
 Possibly carefully tighten the outer screws (fig. 9/4) of
the top plate crosswise.
English
respectively
3
respectively
3
13