VACUUBRAND MD 1C VARIO-SP - Manual (Page 61)

page 61 of 87
Replacing diaphragms and valves
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Please read section ”Replacing diaphragms and valves” com-
pletely before starting maintenance.
The pictures may show other versions of pumps. This does not change
the method of replacing diaphragms and valves.
➨
Never operate the pump if covers or other parts of
the pump are disassembled.
➨
Before starting maintenance, disconnect the elec-
trical power cord (MD 1C with AC motor), respec-
tively the control line (MD 1C VARIO-SP). Wait five
seconds after isolating the equipment from AC power
or from supply voltage to allow the capacitors to dis-
charge.
➨
Ensure that the pump cannot be operated accidentally.
➨
Note: The pump might be contaminated with the pro-
cess chemicals that have been pumped during opera-
tion. Ensure that the pump is decontaminated before
maintenance.
➨
Avoid the release of pollutants.
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Never operate a defective or damaged pump.
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Check every motor capacitor (MD 1C with AC motor)
regularly by measuring its capacity and estimating its
service life. Replace old capacitors early enough to
prevent a failure. The capacitors must be replaced by
a trained electrician.
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Take adequate precautions to protect people
from the effects of dangerous substances
that may have contaminated the pump and
may be released upon disassembly. Ensure
that the maintenance technician is familiar
with the safety procedures which relate to the
products processed by the pumping system.
Use appropriate protective clothing, safety
goggles and protective gloves.