VAR-SPE K2 Vorschriften Seite 25

APPLICATION OF VAR-SPE VARIATORS
IN POTENTIALLY EXPLOSIVE ATMOSPHERES
VAR-SPE variators, when supplied and built in certain forms
and equipped with certain regulation and protective devices,
can be applied in potentially explosive atmospheres in ac -
cordance with European directive 94/9/CE (ATEX 100a)
Regulations for the classi cation of VAR-SPE equipment in
accordance with ExII 3GD IP65 T
The use of VAR-SPE equipment in areas classi ed as ZONE
2(G)-22(D), and as such requiring category 3 equipment, is
possible bearing in mind that:
• All the parts comprising the equipment, whether electrical
or non-electrical (solenoid valves, electric motors, reduction
units, ...) must conform to directive 94/9/CE.
• Maintenance of the IP6x classification requires the use of a
venting cap with non-return valve.
• All the sealing rings of the variator and controls must be of
a uorocarbon compound (VITON).
• With reference to European Directive 94/4/CE – Attach
ment II, the equipment must be selected and used according
to the corresponding mechanical characteristic curves for
continuous operation given in the speci c VAR-SPE techni-
cal documentation, taking into account the expected service
factor.
• Selection and use of the equipment according to the cor -
responding mechanical characteristic curves for intermittent
operation must be made so that these conditions strictly
respect the limits envisaged in the VAR-SPE technical docu-
mentation.
WARNING: Overloading of the variator, when set at a speed
that is less than 30% of the maximum, is not detected by cur-
rent absorption of the electric motor.
Regulations for the classi cation of VAR-SPE equipment in
accordance with ExII 2GDc IP65 T
The use of VAR-SPE equipment in areas classi ed as ZONE
1(G)- 21(D), and as such requiring category 2 equipment, is
possible, also taking into account recurrent faults, operating
defects, improper use.
Regulations for the classi cation of VAR-SPE equipment in
accordance with ExII 2GDbc IP65 T
The use of VAR-SPE equipment in areas classi ed as ZONE
1(G)-21(D), and as such requiring category 2 equipment,
maximum surface temperature T120°C, is possible subject to
the adoption of a number of measures to maintain the protec-
tion level also in the presence of recurrent faults, operating
defects, improper use.
PROTECTION WITH CONTROL OF THE IGNITION SOURCE:
Suitable measures must be taken to monitor the temperature
of the casing or of the oil using passive thermal safeguards
to be connected to special protective apparatus for the power
supply system. The trigger temperature for the thermal safe -
guards is de ned according to the allowed surface tempera -
ture.
WARNING: in the event of failure to connect these safeguards,
or in the case of a fault in the reading system, the surface tem -
perature may exceed 135° C if there is a malfunction.
135° C
1. SURFACE TEMPERATURE
Tmax Temp. < 135°C
The maximum surface temperature of the variator refers to:
a. Use of the variator according to the characteristic curve
envisaged for continuous operation.
b. Ambient temperature Tambient 40°C
c. Variator operating with recommended oil
NOTE: In the presence of recurrent faults, operating defects,
improper use of the equipment the surface temperature will
be
- Max Temp. < 180°C
WARNING: using the variator for prolonged periods accord -
ing to the characteristic curve envisaged for
eration will lead to an increase in surface temperatures
WARNING: if the ambient temperature exceeds 40°C a heat
exchanger must be installed.
WARNING: using oil that does not have the recommended
speci cations may lead to an increase in surface tempera -
tures.
2. WORKING PRESSURE
p
max pressure – continuous ≤100 bar ;
termittent ≤250 bar
The maximum limit for continuous working pressure is re-
180° C spected anyway if the variator is used according to the char -
acteristic curve envisaged for continuous operation. Working
pressure can be monitored using the pressure tap (code M)
available on request.
WARNING: If pressures exceed the values shown, use a
larger size variator or a reduction unit with a higher reduc -
120° C X tion ratio.
NOTE: Parts/components must be replaced with perfectly
interchangeable components that conform to directive 94/9/
CE, and thus approved by VAR-SPE. The associated assembly
must not introduce ignition risks or other hazards over and
above those of the parts/components taken individually, and
must thus be carried out by personnel authorised by VAR-
SPE.
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Operating parameters
intermittent
p
max pressure – in -
op-