Levitronix BFS-i10, Руководство пользователя

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User Manual for BFS-i10
www.levitronix.com
PL-3505-00, Rev00, DCO# 21-249
8
2.5 Pressure-Flow Curves
Figure 7: Pressure-flow curves of bearingless fan BFS-i10.1
Typical values measured for BFS-i10.1
•
Pressure Drop Coefficient at 0 rpm: C = 0.0085
(

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 7400 rpm for 48 V supply
voltage and 4000 rpm for 24 V supply voltage.
•
Negative Rotation Direction: Negative rotational speeds can be enabled in the EEPROM editor of
the Levitronix
®
Service Software or via Modbus command. 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.
0 200 400 600 800 1000 1200 1400
0
1
2
3
4
5
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
0 5 10 15 20 25 30 35 40
Flow / cfm
Pre
s
s
ur
e
/ i
nH
2
O
P
res
s
ure
/ P
a
Flow / m
3
/min
Atmospheric Pressure: 950 hPa, Air Temperature: 24
C
5000 rpm
4000 rpm
7000 rpm
3000 rpm
6000 rpm
7400 rpm
Stability Limit
(Tilting)
48 V Supply Voltage,
Released Performance
24 V Supply Voltage,
Released Performance
1000 rpm
2000 rpm
0 200 400 600 800 1000 1200 1400
-5.2
-4.2
-3.2
-2.2
-1.2
-0.2
-1300
-1200
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
0 5 10 15 20 25 30 35 40
Flow / cfm
P
res
s
ure
/ i
nH
2
O
P
res
s
ure
/ P
a
Flow / m
3
/min
3000 rpm
-4000 rpm
1000 rpm
-6000 rpm
2000 rpm
Stability Limit
(Tilting)
0 rpm
-7400 rpm
48 V Supply Voltage,
Released Performance
24 V Supply Voltage,
Released Performance
4000 rpm
-2000 rpm