Elektror HRD 14T FU, Operating And Assembly Instructions Manual

20

EN

Operating and assembly instructions HRD FU-ATEX

www.elektror.com

9016330 01.20/08

After protective shutdowns, e.g. tripping of the motor circuit-

breaker, activation of the PTC evaluation unit by motors with a 

PTC resistor sensor, or after a protective shutdown of the fre-

quency converter during FC applications, the appliance must 

not be restarted until the problem has been troubleshooted.
If the blower cannot be operated over the whole range of the 

characteristic curve, the motor may overload if the system 

resistance is too low (excessive current consumption). The 

volumetric air 

fl

 ow should be reduced in this case by means 

of a throttle valve 

fi

 tted on the intake or discharge side.

The blower must not be subjected to vibration or impact 

loads.

4.2 Frequency converter operation

A frequency converter is used, allowing a wide range of speed 

adjustments. There is only a small, load-related di

ff

 erence in 

rpm between idle state and the max. load of the blowers and 

the lateral channel blower. Setting work that requires inter-

vention in the converter parameters (e.g. speed adjustment) 

must be carried out (and documented) by quali

fi

 ed  techni-

cians because incorrect values in a few critical converter pa-

rameters (e.g. the cut-o

ff

  frequency of the converter output 

characteristic curve) can result in increased power consump-

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 

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

B

) speci

fi

 ed on the 

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 

mains feeder. For further information, refer to the converter 

manufacturer’s speci

fi

 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 in

fl

 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

The blower must be inspected immediately if vibrations or 

reduced air 

fl

 ow are observed.

Note!
We recommend to have repairs carried out by the 

manufacturer. We cannot accept any liability for 

repairs carried out by third parties.

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 

  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.
•  Inspect the gap between the impeller nozzle and the intake 

  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

•  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 speci

fi

 cations must be documented. It is rec-

ommended that this documentation be kept in a report book 

and safely stored.