Axial innen engl - TLT Turbo GmbH

Am Weinberg 68 · D-36251 Bad Hersfeld/Germany
Phone: +49.6621.950-0 · Fax: +49.6621.950-100
Drive motors
Axial-flow fans of the AXO/AXN type
are powered by surface-cooled motors
according to IEC standards. Up
to motor size 180, standard motors
with type V1, B14 or B5 flanges are
used, depending on the mounting position
(AXO types are always supplied
with B3 flanges). From motor size 200
upwards, standard B3, V5 or V6 footmounted
units are selected, again depending
on the mounting position.
These motors meet VDE 0530 specifications
for electrical machinery, protection
class IP 44, insulation class B,
fitted with noise-tested antifriction
bearings.
Standard versions of these axial-flow
fans are rated for a maximum operating
temperature of 70°C since their
impeller material is not resistant to
higher thermal loads.
Motor bearings require periodic regreasing.
For guidance, the following
lubrication intervals are given:
Motor sizes 63 - 100
n = 3000 rpm 5 000 operating hours
n = 1500 rpm 10 000 operating hours
n = 1000 rpm 20 000 operating hours
n = 750 rpm 20 000 operating hours
Motor sizes 112 - 160
n = 3000 rpm 4 000 operating hours
n = 1500 rpm 8 000 operating hours
n = 1000 rpm 16 000 operating hours
n = 750 rpm 16 000 operating hours
Motor sizes 180 & 200
n = 1500 rpm 5 000 operating hours
n = 1000 rpm 7 000 operating hours
n = 750 rpm 10 000 operating hours
Motor sizes 225 - 280
n = 1500 rpm 2 500 operating hours
n = 1500 rpm 4 000 operating hours
n = 750 rpm 6 000 operating hours
AXIAL FLOW FANS
ELECTRICAL NOTES
GENERAL / MOTOR PROTECTION
In any case, the motor manufacturer's
detailed instructions must be observed
(see motor nameplate). Motors
up to size 200 in standard version
have no relubrication device, on these
motors bearing housings must be
opened to apply new grease. Motors
of size 225 and upwards have a relubricating
device with grease valve.
Single-speed motors can be run on
230 V or 400 V three-phase a.c. (50
Hz); pole-changing motors require a
400 V / 50 Hz three-phase a.c. operating
voltage.
Other voltages, frequencies and class
ratings may be available as special
versions.
Connecting diagrams
Three-phase a.c. motor
Connection: �/Y
Ratio 1 : � 3
e.g.,
230 / 400 V
400 V
500 V
Low voltage High voltage
Motor protection
First of all each power circuit must be
fused. Fuses, however, can only protect
switchgear and mains feeders
against short circuits. They do not
protect the motor from overload. Due
to the breakaway starting current,
which is many times (4 to 6x) the nominal
current, these fuses must be
rated higher than the nominal motor
current would nominally require. To
protect the motor itself, the following
options are available:
027
1. Thermal overcurrent release
(bimetal protection switch)
This current-related motor protection
device is set to the nominal voltage
stated on the motor nameplate. In the
case of an overcurrent it interrupts the
motor contactor holding circuit. This
is the most common overload protection
system adopted for electric motors
nowadays.
2. Thermocouples
In this system, thermostatic circuitbreakers
are incorporated into the
motor winding. In the case of an overtemperature
they open or close a circuit.
They are wired to the motor terminal
panel.
3. Full thermistor protection
Thermistors are temperature-sensitive
resistors which change their resistance
briskly at a given temperature.
Three such components are incorporated
into the motor winding. In conjunction
with a release device they
provide an effective motor temperature
monitoring function.
Electric motors are primarily at risk
from overcurrents due to overloading
or phase failure. For this reason, the
thermal overcurrent release is the
most widespread motor protection
system. Thermal cutouts or thermistors
monitor the winding temperature
directly. Since the winding may
overheat not only from excessive electrical
loads (i.e., overcurrent) but
also due to a malfunction of the
motor-cooling or an increase in the
coolant temperature, these last-mentioned
devices are also referred to as
"full protection" systems. They are
recommended wherever motors are
at risk from cooling failures or
overheating of the coolant. Moreover,
the use of thermocouples or thermistors
is recommended on motors with
a very high number of poles where in
the case of a phase failure, the current
in the remaining phases will increase
but slightly.