8
BL3300 SERIES MANUAL 01/28/2013
SECTION 2
UNPACKING AND INSTALLATION
2.5
INPUT POWER CONSIDERATIONS FOR SINGLE PHASE INPUTS
( C8 and C9 units )
This device utilizes a single phase, full wave, rectifier followed by a capacitive filter to provide main
operating voltages. This type of arrangement produces an input current with a high harmonic content.
These harmonics contribute to the input current requirement but do not contribute to the output
power. This fact equates to the input of this device having a low power factor. Power factor is the ratio
of input volt-amperes ( reactive power) to real power (watts) consumed. The power factor of a single
phase rectifier ( with capacitive filter) is on the order of 0.6 to 0.8 depending on the line impedance
and condition of the capacitors used ( typically electrolytic).
The power factor of this unit should not be confused with the stated output efficiency of 80%. This
rating deals with the inverter efficiency and is measured with a 3 phase input that yields a power
factor closer to 0.95. In order to select the proper electrical service size for this unit, the total
power consumption and input power factor must be considered. What follows below is a typical
example.
The following is assumed:
Output power is in real watts at an efficiency of 80%.
Total power equals 3000 W / 0.8 = 3750 watts
Assuming a worst case power factor of 0.6 a multiplication factor of 1/PF can be used to find the
total input volt-amperes
3750 x 1.66 = 6225 VA
If operating at 120 Vac input ( 108 @ 10% low line ) then the input current requirement is :
6225 / 108V = 57.6 amperes
The actual input current will be somewhat lower and depends on the line impedance in series with
the power supply. Also, if the load being powered is reactive, the actual input current could be
considerably lower. Testing under actual conditions may yield results allowing the use of a
smaller service.
Consultation with an experienced electrician or electrical engineer is highly
recommended.
Summary of Contents for BL3300 Series
Page 9: ...3 BL3300 SERIES MANUAL 01 28 2013 ALL MANUAL ADDENDUMS WILL FOLLOW THIS PAGE ...
Page 15: ...9 BL3300 SERIES MANUAL 01 28 2013 SECTION 2 UNPACKING AND INSTALLATION ...
Page 17: ...11 BL3300 SERIES MANUAL 01 28 2013 FIGURE 2 2 ...
Page 20: ...14 BL3300 SERIES MANUAL 01 28 2013 ...
Page 33: ...3 PHASE POWER CHASSIS MECHNICAL OUTLINE ...
Page 34: ...BL3300 CONTROL CHASSIS MECHANICAL OUTLINE ...
Page 35: ...BL33XX SERIES SINGLE PHASE POWER CHASSIS OUTLINE DRAWING 19 0 TYP 17 TYP 7 0 MAX ...
Page 54: ...6 1 SECTION 6 PARTS LIST AND DRAWINGS f ...
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