17
Chapter
6
Fan
6.1.
Commissioning
Commissioning
may
only
be
carried
out
by
trained
professionals.
The
trained
professional
in
question
must
assure
him
‐
or
herself
that
the
fan
is
in
perfect
working
order.
The
commissioning
regulations
for
electrical
ma
‐
chines
must
be
observed.
•
Check
the
safety
devices.
•
Turn
on
the
main
switch.
•
Switch
on
the
fan.
The
fan
may
only
be
switched
on
once
the
relevant
ductwork
has
been
connected.
This
ensures
that
there
is
sufficient
system
resistance
during
the
run
‐
up
phase.
•
When
commissioning
the
fan
for
the
first
time,
check
the
direction
of
rotation
of
the
motor.
CAUTION
The
fan
must
turn
in
the
direction
indicated
by
the
arrow.
The
direction
of
rotation
can
be
checked
using
a
field
of
rotation
tester.
•
Check
the
power
consumption.
The
permitted
power
consumption
of
the
motor
must
not
be
exceeded.
6.2.
Shutdown
•
Switch
off
the
fan.
•
Turn
the
main
switch
to
the
"OFF"
position
and
secure
so
that
it
cannot
be
turned
back
on
by
an
unauthorized
person.
6.3.
Startup
behavior
of
fans
There
must
be
a
sufficient
acceleration
torque
over
the
entire
startup
range
up
to
the
nominal
speed
to
enable
the
run
‐
up
of
the
fan.
This
is
not
always
the
case
for
medium
‐
and
high
‐
pressure
fans.
In
such
cases,
the
fan
can
be
run
up
against
a
closed
throttle
device.
Power
supply
units,
switching
devices,
monitoring
devices
(if
present),
and
cable
cross
‐
sections
must
be
dimensioned
and
checked
by
the
customer
with
regard
to
their
startup
type
and
time
and
their
current
peaks.
6.4.
Startup
for
direct
activation
In
the
case
of
the
direct
activation
of
the
fan,
the
motor
develops
a
high
torque
at
a
high
starting
current.
The
starting
current
during
the
startup
phase
is
between
5
and
8
times
the
nominal
current
depending
on
the
impeller
class
.
This
high
power
consumption
must
be
taken
into
account
when
choosing
the
fuses.
