9
L1
L2
L3
N
U
U
U
UL
UL
EN
Operating and assembly instructions axial fans
www.elektror.com
Axial 07.12/05
tion match the rating plate. (swap the phases at the termi-
nal box if wrong direction of rotation).
Warning!
Only switch on the ventilator when the impeller
is no longer exposed! The rotating impeller might
severely injure you or suck you in! Only switch
on when everything is completely attached.
• Check the current drawn by the motor. Compare this
against the motor’s nominal current.
• Without fail check for vibration of the ventilator. Compare
the measured vibrations with VDI 2056 group T. Our impel-
lers are balanced according to ISO 1940 quality level G
2.5.
• In the case of speed-regulated ventilators, please perform
vibration measurement for the entire speed range.
• The ventilator must not be operated in the break-off (unsta-
ble region of the characteristic).
Electrical connection
The electrical connection must be set up by a trained electri-
cian. The service connection can be gathered from the mo-
tor’s rating plate. The motor must not be operated without
motor protection. Any existing thermistor / thermal contact
motor protection devices must be in service before the initial
start-up!
A lockable switch must be
fi
tted in the direct supply line to the
motor, so that the ventilator can be isolated from the mains
when an inspection is carried out.
The electrical supply line must be laid with protection against
it being damaged.
Service connection
The mains frequency in Germany is 50 Hz. The voltage be-
tween two main conductors (L1L2L3) is the line-to-line volt-
age UL (voltage between phases, mains voltage). The volt-
age between a main conductor and the centre conductor is
the star voltage Uph (phase voltage). Here the following rela-
tion exists: UL = 1.73 x Uph.
The three winding starts (U1, V1, W1) and winding ends
(U2, V2, W2) are fed to the six terminals in the terminal box.
There, the three main conductors (L1, L2, L3) are always
connected to the phase winding starts.
If the phase ends are joined together (U2, V2, W2), then
the motor is connected in star (Y). At the star point, the sum
of the voltages and currents is equal to zero, and here the
phase resistance lies on the phase voltage. The motor cur-
rent corresponds to the current in the winding phase.
If the end of each phase is joined to the start of the next,
then the motor is connected in delta. The phase resistance
lies on the mains voltage. The motor current derives from the
geometric sum of two phase currents (Figure 2)
These relationships make it clear that a motor can be con-
nected both in Y-connection (star) on the 400 V supply and in
delta-connection on the 230 V supply. Approximately the same
current
fl
ows in the winding phase in both cases. A similar
situation also applies for the new preferred voltages of 690 V
(Y) and 400 V
(delta). If the
a l p h a b e t i c
sequence of
the terminal
designations
(U1, V1, W1,
U2, V2, W2)
matches the
temporal se-
quence of
the phases,
the machine
should rotate
c l o c k w i s e .
With anti-
c l o c k w i s e
rotation, to
external con-
necting leads
on the ma-
chine must
be swapped. According to VDE 0530 the terminal box must
also have a connecting terminal for the protective conductor.
Machines with a nominal power that exceeds 100 kW must
also have an earth terminal on the housing.
8 OPERATING THE VENTILATOR
The ventilator must be operated only by persons trained in
how to use it. The ventilator may only be used when:
• all safety devices and safety-critical monitoring devices
are
fi
tted and working.
• nobody is in the danger area of the machine
• all inspection holes are safe and closed.
If the ventilator is not working properly, it must be stopped
straight away and secured in this state. Get the fault recti
fi
ed
straight away!
Danger!
The ventilator may be operated up to maximum
speed only if the maximum temperature is not ex-
ceeded! The impeller can
fl
y asunder! Parts
fl
ying
out could kill or severely injure you! The impeller
strength rating is only up to the maximum operat-
ing conditions as indicated on the rating plate.
9 SERVICING
9.1 GENERAL
Caution!
Before performing maintenance or inspection
work on this ventilator, you need to have read and
understood the operating manual.
Modi
fi
cations
Unauthorised modi
fi
cations to the ventilator are forbidden for
safety reasons. Elektror must be consulted and written ap-
proval obtained before making any alterations.
Danger!
The ventilator must be disconnected from the
mains supply, and safeguarded against being
switched on again, before performing mainte-
nance work! Severe injuries could result if the
ventilator were to suddenly start up.
Winding designs 220 V / 380 V
220 V
W2
W2
U1
V1
W1
U2
V2
V2
V1
W1
L3
L2
U2
U1
L1
L1
Δ
-configuration
L2
L3
V2
V1 L2
L2
U2
U1
L1
380 V
direct power supply at operating voltage
U1
V1
W1
W2
U2
V2
Y-configuration
L1
L2
L3
