WVM_BASIS_EN_03—07/2016
47
Electric current warning!
Work on the electric system must only be carried out by qualified
technical personnel!
Cleaning
►
Remove dust with dry cloth; use moist cloth, if necessary.
►
Clean all surfaces, e.g. at the operating panel, with a moist cloth.
Daily maintenance tasks
Complete visual inspection and function test of the entire dryer
►
Inspect dryer for visual damage and unusual noises.
►
If your dryer is not connected to a fault signalling system (see page 34),
check whether there is an error message on the display at the switch cabinet.
Assess any existing fault messages (heed the malfunction table in the
controller manual!).
►
Check whether compressed air has reached the set pressure dewpoint. In
units equipped with dewpoint-dependent control (optional), the dewpoint is
shown at the display.
Check dam pressure
If, following depressurisation of a vessel, e.g. after the expansion phase, the
overpressure has not decreased to < 0,5 bar, then there is a residual pressure,
designated as dam pressure, in the vessel.
►
Check for dam pressure: if the dryer functions correctly, the respective
pressure gauge indicates < 0,5 bar. Then there is no dam pressure.
If the dam pressure is greater than < 0,5 bar:
►
Depressurise the dryer and shut it down (see page 42).
Dam pressure can be caused by:
a blocked muffler,
a malfunction of the expansion valve,
a leaking pressure build-up valve.
The respective necessary maintenance measures are described in the following
sections.
