2
must be equipped with a safety cut-
out switch that must be disconnect-
ed before work on the fan is com-
menced.
Contact guard
: Free inlet and outlet
openings must be guarded by pro-
tective grilles.
3.4 Electric connection
Connection to the mains is done di-
rectly in the terminal box mounted
on the outside of the fan casing.
Connect the motor cables according
to the connection diagram on the in-
side of the box lid.
Refer also to the motor name plate as
well as the order specification.
Important:
The installation and
connection to the supply
network must be done
by authorised personnel
and be in accordance
with current legislation.
Fans fitted with frequency drives
must be installed in accordance with
the EU standard for electromagnetic
compatibility (EMC). The shielding
and connection to ground eliminate
interference and protect the motor
bearings and windings. Refer to the
motor documentation for methods
to avoid impairment of the mains
power quality. Prescribed methods
may involve installation of a rectifi-
er, filters etc.
4. Start-up
4.1 Before start-up
Check that:
-
electrical connections fulfil ap-
plicable requirements.
-
all contact guards are installed as
prescribed.
-
fans mounted on vibration
dampers can move without af-
fecting flexible and electrical
connections.
-
impeller rotation direction com-
plies with the arrow plate (check
by briefly starting the fan).
4.2 Fans with inlet guide vane
The motion area of the servomotor
must not exceed that of the inlet
guide vane.
4.3 Motors with Y /
Δ
start
The relay must be set to the calculat-
ed start time.
4.4 Frequency-controlled mo-
tors
If a frequency converter is to be used
to control motor rotational speed,
please check the following.
-
Cables between motor and fre-
quency converter must be
shielded.
-
The max. rotational speed set on
the frequency converter must
conform with the max. rotation-
al fan speed so that it cannot be
exceeded.
4.5 Start-up procedure
-
Start fan
-
Check that there are no abnor-
mal mechanical noises or pulsa-
tions.
-
Check the vibration level. It
must not exceed 7 mm/s, RMS,
measured on bearing housings.
4.6 Repeat inspection
After thirty minutes of operation,
check that the fan operates normally.
-
Motor does not get warm.
-
Vibration speed does not exceed
7 mm/s.
-
There are no abnormal noises.
-
Power consumption is acceptable.
4.7 Calculation of air volumes
The volume flow through the fan is
calculated with the following formu-
la and coefficients.
Where
Motor size
160-280
Motor size
250-315
100%
85%
70%
100%
70%
630
274
-
257
291.5
710
333
-
313
352.5
800
461
453
436
483
900
578
559
536
603
1000
680
656
629
708
1120
1047 1021
1078
988
1250
1188 1154
1223
1114
Table 1 – Total weight excl. motor [kg]
Impeller weight
100%
85%
70%
630
67
-
61
710
86
-
77
800
109
101
97
900
138
127
123
1000
166
158
151
1120
212
204
195
1250
258
248
238
Table 2 – Impeller weight [kg]
V = D
3
x n x (a + b x P’
2
+ c xP’
4
+
d x P’
6
+ e x P’
8
+ f x P’
10
+ g x P’
12
)
V : Volume flow [m
3
/s]
D : Nominal impeller diameter [m]
n : RPM
P : Static pressure over fan [Pa]
r : Air density [kg/m
3
]
V’ :
P’ :
Duct on pressure and suction side
a
a.
Static pressure on suction side 1xD
from fan and on pressure side 2-3xD
from fan
100%
85%
70%
50%
a 7,774E-01
6,562E-01
5,703E-01
4,301E-01
b -1,749E-03 8,990E-03 -5,222E-03 -1,268E-02
c -2,328E-03 -4,929E-03 -1,822E-03 5,243E-04
d 2,144E-04
4,961E-04
2,262E-04 -4,248E-07
e -9,398E-06 -2,360E-05 -1,194E-05 -1,785E-06
f 2,048E-07
5,394E-07
2,934E-07
7,694E-08
g -1,806E-09 -4,786E-09 -2,776E-09 -9,860E-10
Table 3. Calculation coefficients
Free inlet and duct on pressure side
a
a.
Static pressure on suction side (velocity
= 0) and in duct 2-3xD from fan
100%
85%
70%
50%
a 7,444E-01
6,057E-01
4,688E-01
4,197E-01
b -1,929E-02
1,469E-02
4,031E-02
-1,469E-02
c -4,011E-04 -7,327E-03 -1,186E-02
9,475E-04
d 1,534E-04
8,136E-04
1,230E-03
-4,052E-05
e -1,026E-05 -4,171E-05 -6,162E-05 -5,829E-08
f
2,791E-07
1,009E-06
1,480E-06
4,534E-08
g -2,803E-09 -9,358E-09 -1,370E-08 -8,196E-10
Table 4. Calculation coefficients
V
′
V
D
3
n
-------
-------
=
P
′
P
D
2
n
2
1.2
×
ρ
-------------------
-------------------
--------------------
=
