Power Supply; Inrush Current - Levitronix BFS-i10 User Manual

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Power Supply Rating: Depending on the operating point, one power supply may be used to power
several bearingless fans simultaneously, or a supply with lower power rating may be used (see also
section 3.1.2).
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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 (±20 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 600 W at operating point with maximum power consumption. The fan accelerates with
2000 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 600 W input power is around
6500 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-i10 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
PULS Power
QS40.481
Supplies
Mean Well HRPG-1000-48
TDK Lambda RWS1000B-48
Cosel PJA1000F-48
Traco Power TSP-600-148-M
TDK Lambda RWS600B-48
Traco Power TIB 480-148
Traco Power TIB 240-124
Additionally tested and passed, but discontinued by manufacturer: Cosel PLA600F-48 (600 W, limits as stated for other 600 W supplies)
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:
Mean Well RSP-1000-48 / Mean Well SDR-960-48

3.1.3 Inrush Current

The BFS-i10 features an inrush current limitation circuit. A peak value of 25 A with an I
measured by hot-plugging the BFS-i10 with 5 m cable length to a 1000 W power supply.
PL-3505-00, Rev00, DCO# 21-249
Characteristics Value / Feature
85 – 264 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output continuous / peak 960 W / 1440 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 1008 W
Certification / Standards CB, UL, CSA
85 – 265 V AC (auto. detection) / 48 V DC
Voltage Input / Output
Power Output 1008 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) / 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 continuous / peak 480 W / 720 W for 4 s
Certification / Standards CB, UL, CSA, Semi F47
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
User Manual for BFS-i10
www.levitronix.com
®
® with according speed and/or input power
Recommended Limits
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 700 W (peak)
Speed limit 6000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 2 fans per power supply:
Input power limit 484 W (peak & continuous)
Speed limit 6000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 3 fans per power supply:
Input power limit 316 W (peak & continuous)
Speed limit 5000 rpm (continuous)
- No limit required (1 fan per power supply)
- Example limits for 4 fans per power supply:
Input power limit 232 W (peak & continuous)
Speed limit 4500 rpm (continuous)
- Recommended limits (1 fan per power supply):
Input power limit 580 W (peak & continuous)
Speed limit 6500 rpm (continuous)
- Recommended limits (1 fan per power supply):
Input power limit 580 W (peak & continuous)
Speed limit 6500 rpm (continuous)
- Recommended limits (1 fan per power supply):
Input power limit 700 W (peak)
Speed limit 6000 rpm (continuous)
- Recommended limits (1 fan per power supply):
Input power limit 340 W (peak)
No speed limit (automatically limited to 4000 rpm,
if 24 V supply is detected
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Service Software or
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