Power Supply; Inrush Current - Levitronix BFS-i06 User Manual

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Input Power Limitation: An optional input power limit may be set via Levitronix
Modbus protocol. If set, actual acceleration rate and/or maximum speed are reduced dynamically such
that the specified limit is not exceeded (±10 W tolerance). The extent to which they are reduced
depends on the power limit as well as the operating point. The dashed line in Figure 9 shows an
example for 120 W at operating point with maximum power consumption. The fan accelerates with
8000 rpm / s up to 5000 rpm, then gradually reduces the acceleration rate to prevent further increase
in input power. The maximum reachable speed in this operating point at 120 W input power is around
10500 rpm (see also steady state consumption, Figure 8).

3.1.2 Power Supply

It is highly recommended to evaluate used power supplies under demanding operating situations like fast
braking from maximum speed and during power on and take-off of the fan rotor.
The power rating of the supply may be chosen according to the desired operating point / maximum speed /
number of fans per supply – see Figure 8, Figure 9.
Table 4 shows a selection of power supplies tested at Levitronix
limitations. Please note that only the general functionality of the BFS-i06 in combination with the given supplies
was tested, and no recommendations in terms of reliability, efficiency, certifications, cost effectiveness or
similar are given.
Manufacturer Article Name Characteristics
Traco Power TIB 480-148
TDK Lambda HWS300-48
Traco Power TIB 240-148
Traco Power TSP-600-148-M
TDK Lambda RWS600B-48
Cosel PJA1000F-48
Traco Power TIB 240-124
Additionally tested and passed, but discontinued by manufacturer: Cosel PLA600F-48 (600 W)
The following power supplies were tested but failed to recover the DC voltage quick enough during fast braking
and accelerating tests, triggering a shutdown to error state on the fan:
TDK-Lambda RWS300B-48 / Cosel PJA300F-48

3.1.3 Inrush Current

The BFS-i06 bearingless fan relies on the inrush current limiter of the power supply and does not have a built-
in inrush current limiter. Therefore, high inrush currents may occur if the fan is directly connected to an already
powered DC socket. These high inrush currents might disturb certain power supplies.
A peak value of 150 A with an I
length to a 480 W power supply. It is therefore recommended to connect the bearingless fan to the power
supply BEFORE powering up the supply.
PL-3502-00, Rev00, DCO# 21-249
Value / Feature
85 – 264 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output continuous / peak 480 W / 720 W for 4 s
Certification / Standards CB, UL, CSA, Semi F47
85 – 265 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output 336 W
Certification / Standards CB, UL, CSA, Semi F47
85 – 264 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output continuous / peak 240 W / 360 W for 4 s
Certification / Standards CB, UL, CSA, Semi F47
85 – 264 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output 600 W
Certification / Standards CB, UL, CSA, Semi F47
85 – 265 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output 600 W
Certification / Standards CB, UL, CSA, Semi F47
85 – 264 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output 1008 W
Certification / Standards CB, UL, CSA
85 – 264 V AC (auto. detection) / 24 V DC
Voltage Input / Output
Power Output continuous / peak 240 W / 360 W for 4 s
Certification / Standards CB, UL, CSA, Semi F47
Table 4: Specification of tested power supplies
2 2
t value of 2.9 A s was measured by hot-plugging the BFS-i06 with 5 m cable
User Manual for BFS-i06
www.levitronix.com
®
® with according speed and/or input power
Recommended Limits
- No limit required (up to 2 fans per power supply)
- Example limits for 3 fans per power supply:
Input power limit 230 W (peak)
Speed limit 11000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 150 W (peak & continuous)
Speed limit 11000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 170 W (peak)
Speed limit 10000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 290 W (peak & continuous)
No Speed limit
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 290 W (peak & continuous)
No Speed limit
- No limit required (up to 3 fans per power supply)
- Example limits for 4 fans per power supply:
Input power limit 250 W (peak & continuous)
No Speed limit
- No limit required (1 fan per power supply)
(Auto. limit 8000 rpm, if 24 V DC is detected)
- Example limits for 2 fans per power supply:
Input power limit 170 W (peak)
No Speed limit (auto. limit 8000 rpm)
Service Software or
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