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Operating and assembly instructions HRD ATEX
• 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:
Attention!
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
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
www.elektror.com
Prohibited
range
f
B
• Never set a higher frequency (speed) at the converter
than the max. frequency f
B
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 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.
3.4 Confi guration for three-phase current blowers
W2
U2
V2
U1
V1
W1
L1
L2
L3
(L3)
(L1)
circuit
(low voltage)
Checking the direction of rotation
Switch on the blower. The running direction of the impeller
should correspond to the direction arrow on the housing.
If the impeller rotates in the wrong direction, then interchange
L1 and L3.
3.5 Additional terminals
Connection diagrams for all circuits are provided in the ter-
minal boxes of the motors upon delivery. This also applies
to thermal winding protection.
4 INSTRUCTIONS FOR OPERATION
AND USE
4.1 Basic information
Please observe the notes on designated use in section 1.1,
as well as the safety guidelines in sections 1.2 to 1.13.
If electrical current drops below the rated current of the drive
motor during operation, check to see if the mains voltage and
frequency match the appliance ratings (motor nameplate).
indicated on the nameplate! !
Run-up time
Expiry time
[s]
[s]
5
10
10
20
20
40
30
60
30
100
W2
U2
V2
U1
V1
W1
L1
L2
L3
(L3)
(L1)
Y circuit
(high voltage)
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