Renfert 2921-0050, Manual

Page: 24 / 195

EN - 6 -
3.3.3 r
EplAcing thE
E
lEctronics
f
iltEr
Cooling air for the unit’s electronics passes through
the electronics filter. The type of material trapped by
the filter and the degree of contamination depend on
the ambient laboratory conditions.
The filter should be examined annually and replaced,
as necessary:
• Press on the two lock tabs on the filter cassette
and pull the cassette off towards the rear of the unit
(Fig. 24).
• Properly dispose of the filter and the filter cassette.
Always comply with all local ordinances
governing proper disposal and accident
prevention!
Depending on the filter contents, protective
clothing may be required.
• Install a new filter cassette and filter on the
opening.
• Make sure the filter cassette is properly seated and
locked in place on both tabs.
Use only original Renfert electronics filters
(refer to the spare parts list).
3.4 Fuses
Instead, two device overload switches, (L, Fig. 4) are
provided to protect these units.
Press the button to reset a switch which has tripped.
3.5 Self-diagnosis
The dust extractor is equipped with a self-diagnosis,
which checks various functions and displays errors
on the display (G).
Before the diagnosis takes place, insert a
new dust bag and ensure that the fine filter
is clean and the suction pipe is not blocked.
Activate the self-diagnosis:
• Switch Silent TS off;
• Press and hold the operating mode selector switch
(D) and switch Silent TS on (Fig. 7a).
• For approx. 3 sec.:
- all LED displays are illuminated,
-
An „8“ is indicated in the display
- The signalling device gives an acoustic signal.
• A “d” appears on the display during the unit’s self-
test (Fig. 7b). During this time, the unit’s electronics
check various internal elements and functions. The
suction turbines will briefly run at Level 1 during this
test phase.
• If no errors are detected, the
Silent TS
automatical-
ly goes into the previously selected operating mode
at the end of the self-test (after approx. 10 sec.).
• If an error is detected during the self-test, a flashing
“E” will appear on the display, together with a num -
ber (1 to 3).
These indicate:
E1: Airflow sensor fault; have the unit repaired.
E2: Plug on grey motor wire out of its socket
(Fig. 26) or suction turbine fault. Replace
suction turbine if necessary (refer to the spare
parts list).
E3: Error in the electronics; have the unit repaired.
In this case, the Silent TS remains in the self-di-
agnosis mode until it is switched off at the OFF
switch (A).
3.6 Replacing the Suction
Turbine
The suction turbine is encased in an encapsulating
housing to form a single unit, thus allowing it to be
easily replaced without the need for any tools.
Before opening the unit, disconnect it from
the mains power supply by unplugging the
power cord from the wall outlet.
The motor may be hot. Allow the motor to
cool off before proceeding.
The suction turbine may only be operated
when it is installed in the unit. Only an au-
thorized electrician may perform a function-
al inspection of or repair the unit.
Please observe the documents included
with the spare part!
• Turn the lock knob 90° anticlockwise (Fig. 25).
• Remove the motor compartment cover.
• Open the fixing clip and remove the motor plug
(Fig. 26).
• Loosen the two internal, grey knurled nuts (Fig. 27)
and unscrew them approx. 1 cm. These knurled
nuts do not need to be completely removed.
• Release the suction turbine by turning it anticlock-
wise, then pull it straight out towards the back
(Fig. 28).
• Install the new suction turbine (Fig. 28) by pushing
it in straight and turning it clockwise to lock it in
place (Fig. 29). The connecting wire should be on
top (Fig. 28a).
• Tighten the internal knurled nuts (Fig. 27).
• Insert the motor plug and close the fixing clip
(Fig. 26).
• Check that the lock knob is in the open position
(vertical).
• Place the motor compartment cover on the motor
compartment. Two guide pins have been provided
on the cover to assist in positioning it correctly.
• Turn the lock knob 90° clockwise (Fig. 31).
Always comply with all local ordinances
governing proper disposal and accident
prevention!