User Manual for BFS-i06
www.levitronix.com
PL-3502-00, Rev00, DCO# 21-249
8
2.5 Pressure-Flow Curves
Figure 7: Pressure-flow curves of bearingless fan BFS-i06.1
Typical values measured for BFS-i06.1
•
Pressure Drop Coefficient at 0 rpm:
C = 0.097
(
P = C x Q
2
, Q = Flow [l/s],
P = Pressure Drop [Pa]).
•
48 V / 24 V Supply Voltage:
The maximum rotational speed is limited to 13000 rpm for 48 V supply
voltage and 8000 rpm for 24 V supply voltage.
•
Negative Rotation Direction:
Negative rotational speeds can be enabled in the EEPROM editor of
the
Levitronix
®
Service Software
. This feature can be used to block an existing flow, as replacement
for actively controlled valves. If negative flow needs to be avoided for safety reasons, it is
recommended to install passive check valves or a safety shutdown mechanism to deactivate the
bearingless fan in case of negative flow.
•
Serial or Parallel Operation of Multiple Fans:
Multiple fans can be used to achieve higher pressure
or flow levels.
a. Serial: Pressure is multiplied by up to the number of fans, while flow remains unchanged.
b. Parallel: Flow is multiplied by up to the number of fans, while pressure remains unchanged.
0
50
100
150
200
250
300
0
0.5
1
1.5
2
2.5
3
3.5
4
0
100
200
300
400
500
600
700
800
900
1000
0
1
2
3
4
5
6
7
8
9
Flow / cfm
P
re
ssu
re
/
i
n
H
2
O
P
re
ss
u
re
/
P
a
Flow / m
3
/min
Atmospheric Pressure: 950 hPa, Air Temperature: 24
C
8000 rpm
6000 rpm
12000 rpm
4000 rpm
10000 rpm
13000 rpm
Stability Limit
(Tilting)
48 V Supply Voltage,
Released Performance
24 V Supply Voltage,
Released Performance
2000 rpm
0
50
100
150
200
250
300
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
0
1
2
3
4
5
6
7
8
9
Flow / cfm
P
res
s
ure
/ i
nH
2
O
P
res
s
ure
/ P
a
Flow / m
3
/min
6000 rpm
-6000 rpm
4000 rpm
-10000 rpm
-13000 rpm
Stability Limit
(Tilting)
0 rpm
