Inspection And Maintenance Intervals:; Instructions For Maintenance; Ball Bearings - Elektror HRD serie Betriebs- Und Montageanleitung

Operating and assembly instructions HRD FU-ATEX
tion, overheating, winding damage and/or malfunction of the
ATEX application.
Please also note the instructions under 3.3 (ff).
If they are not observed, the motor current will increase
EN
disproportionately and the drive motor will fail to achieve its
rated speed.
Note!
Do not set the converter to a higher frequency
(rpm) than the frequency (f
nameplate, because this can overload the motor
or irreparably damage the blower due to over-
speeding. Similarly, a so-called boost must never
be set at the converter because this would result
in excessive heating of the drive motor. The
temperature sensors must be connected to the
relevant converter inputs in order to protect the
drive motor.
To ensure safe and trouble-free operation of the
frequency converter, the installation and safety
instructions provided by the frequency converter
supplier in the operating or application manuals
must be strictly adhered to.
Protection by residual-current-operated circuit breaker
(FI circuit-breaker):
The present IGBT frequency converters produce discharge
currents of >=3.5 mA due to their design principle. These dis-
charge currents can lead to unwanted tripping in systems
protected by a 30 mA-FI circuit-breaker.
If a fault occurs, fault currents can also discharge through the
PE conductor as direct current. If protection is needed on the
supply side by means of an FI circuit-breaker, then an ACDC
sensitive (type B) FI circuit-breaker must be used. Use of an
FI circuit-breaker other than type B can cause death or seri-
ous injury if a fault occurs.
To meet the EN 61800-5-1 standard, the PE conductor must
be duplexed and routed through separate terminals or have
a cross-section of at least 10 mm² Cu.
Operation and connection to public grids:
Most frequency converters are designed to operate on indus-
trial grids. If the converter is connected directly to and oper-
ated on a public grid, then additional interference suppres-
sion measures, such as a mains choke, must be built into the
20
mains feeder. For further information, refer to the converter
manufacturer's specifi cations.

5 INSTRUCTIONS FOR MAINTENANCE

5.1 Basic information
Before and after maintenance/service measures, repairs or
replacement of parts, an Elektror ATEX blower may only be
employed as intended (see 1.1).
Before commencing with the maintenance/service measure,
repair or replacement of parts ensure that the blower impel-
ler has stopped and the blower has been secured reliably to
prevent start-up. For instance, electric power supply to the
blower must be interrupted, ideally by separation at the ter-
minals.
At no point during maintenance, cleaning, service or repair
may an explosion hazard exist or arise.
Wear parts are subject to the recommend maintenance in-
tervals (see 5.2 to 5.7 ). The service life of wearing parts
(ball bearings and fi lters) depends on the operating hours,
the load and other infl uences, such as temperature, etc.
Accessibility for regular maintenance must be ensured.
Maintenance and servicing may only be performed by per-
sons with the necessary expertise and regular training. In ad-
dition to the appliance's operating instructions and the regu-
lations and recommendations for the system as a whole, the
following points should be observed:

5.2 Inspection and maintenance intervals:

The operator must set the cleaning, inspection and mainte-
nance intervals himself according to operating hours, load
and operating conditions.
Immediate inspection and maintenance
) specifi ed on the
B The blower must be inspected immediately if vibrations or
reduced air fl ow are observed.
Perform the following tasks in course of every inspec-
tion/maintenance job as well as upon repair and replace-
ment of parts:
• Visually inspect all movable parts of the blower, such as
• Inspect the gap between the impeller nozzle and the intake
• If ATEX blowers are stored for replacement, note that some
components installed have a limited storage life. This espe-
cially applies to the ball bearings, e.g. concerning the life of
the grease lubrication. The storage life depends on the type
of storage and the unit type as well as on the conditions and
duration of storage of the Elektror product. Type-related in-
formation can be acquired from Elektror Product manage-
ment.
• Inspection and service work must be documented chrono-
logically and fully stating the name of the person responsi-
ble. In particular, operating errors, measures implemented
as well as compliance with all applicable regulations and the
manufacturer's specifi cations must be documented. It is rec-
ommended that this documentation be kept in a report book
and safely stored.

5.3 Ball Bearings

Bearing life: The information provided by the manufacturer of
the ATEX motor exclusively applies (also refer to 5.7).
The ball bearings must be in perfect condition; this must be
checked during all maintenance work.
We recommend ball bearings are replaced every two years.
The time when the ball bearings will need replacing depends
on operating conditions and might be later, but could also
be much sooner, than this. The operating fi rm bears sole re-
sponsibility for safe judgement of when replacement is nec-
essary.
Note!
We recommend to have repairs carried out by the
manufacturer. We cannot accept any liability for
repairs carried out by third parties.
impeller, blower housing cover / intake nozzle for possible
damage, scoring, wear, fi ssures, cracks, deformation;
proper condition of all earthing connections, radial shaft
seals etc.
nozzle at the blower cover.
ATEX machine type HRD 7 FU:
Minimum gap 3.0 mm
All other HRD ATEX machine types:
Minimum gap 2.0 mm
Note!
Information concerning the achievable hours of
operation refers to the rated speed and intended
use, excluding frequent start-up and shutdown.
Depending upon performance, earlier replace-
ment of bearings and radial shaft seals may be
necessary.
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