Elektror ATEX ND Instructions De Service Et De Montage page 19

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connectors.
• Connect the motor and PTC evaluation cable be-
tween the motor and frequency converter output
with shielded cables.
• Connect the shielding braid of all cables con-
sistently and on both sides, i.e. to the frequency
converter, motor and control cabinet, to establish
a low impedance electrical connection with the
protector conductive system. A suitable EMC
cable gland must be used on the motor side to
establish a low impedance contact with the entire
cable shielding.
3.3.2 Special features of drive motors for frequency
converter operation:
• Depending on the input voltage of the converter, the motor
can operate with a delta or star-point connection. The
specifi cations on the motor nameplate are defi nitive.
• Please refer to the information on EMC-compliant instal-
lation and assembly of the frequency converter, in the
supplier documentation.
• Tripping relays that meet the criteria set out in Directive
IEC 61508 are suitable and able to switch to a fail-safe
safety position in the case of faults.
• Connect the output contact of the triggering device to an
appropriate release input on the frequency converter or
take another appropriate measure, ensuring that the
switch-off of the fan meets the safety requirements and it
can only be reset manually.
• The Ex db eb II 2GD T4 135°C motors used are equipped
with "PTC sensors for sole protection". This must be con-
nected to an ATEX-certifi ed triggering device and evalu-
ated so that the fan is switched off reliably in the case of
an error (see 3.3.1).
Do not connect the frequency converter directly to the
monitoring device!
• Use EMC cable connections at the motor.
• If special ambient conditions prevail, which cause strong
contamination of the blower or the cooling ribs of the
motor, ensure regular inspection of the devices.
3.3.3 For trouble-free operation of the blower, it is
important that the converter meets the following
requirements:
Note!
An unsuitable explosion-proof frequency convert-
er must not be operated in the ATEX environment
of the motor/fan. It is essential that this is prop-
erly installed, parametrized and operated outside
of the ATEX zone.
• Converter output equal to or higher than motor output at
max. frequency*)
• Converter current equal to or higher than rated motor
current at max. frequency*)
• Converter output voltage equal to or higher than rated
motor voltage at max. frequency*)
• Supply voltage max. 480V, including 5% voltage tolerance
• Pulse frequency of the converter equal to or greater than
8 kHz because a lower pulse frequency can cause loud
motor noises.
Note!
Insofar as a frequency converter package is
included with the delivery, it is not suitable for in-
stallation and operation in an ATEX environment
and must be properly installed, parameterized
and operated outside of the ATEX zone. You must
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Operating and assembly instructions ND ATEX
read the instructions in the operating and installa-
tion instructions for the frequency converter.
• If a motor fi lter is included in the scope of supply, it must
be installed in accordance with the specifi cations in the
assembly instructions of the converter/motor fi lter manu-
facturer.
*) Refer to the nameplate for values.
3.3.4 Special features related to connection and com-
missioning of the blower / drive motor with
converter operation
• The limit data for converter operation is stamped on the
nameplate of the motors with pressure-proof
encapsulation.
At the converter, the voltage/frequency assignment
must be set according to the diagram.
U
B
Prohibited
0
U und f see nameplate
B B
• Never set a higher frequency (speed) at the converter
than the max. frequency f
Otherwise the motor can be overloaded or the blower
can be destroyed due to the excessive speed of the
blower impeller.
• No specifi c boost should be permitted to occur in the lower
frequency range because the winding can overheat if the
cooling capacity of the fan blade is reduced.
Note!
The following times apply for the respective
device motor output class (see rating plate) with
run-up/expiry as well as speed changes in order
to to avoid high component loads and faults in
the converter operation:
Device motor output
Motor output < 0.25 kW
0.25 kW < Motor output
<=3.0 kW
3.1 kW < Motor output
<= 7.5 kW
7,6 kW < Motor output
<= 11.0 kW
11,1 kW < Motor output
<= 30.0 kW
A uniform run-up and expiry must be guaranteed within the
run-up and expiry times.
No speed changes must occur during operation that exceed
the speed change during run-up and expiry.
Prohibited
range
f
B
indicated on the nameplate! !
B
Run-up time Expiry time
[s] [s]
5 10
10 20
20 40
30 60
30 100
EN
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