Vega Customer Applications Manual
Section 1 - Connection
Rev. A3: October 2003
Page 4 of 48
There is also available a screw terminal input version of Vega. This has a perspex safety cover and access to fit the
screw terminals to the input is via 3 holes in the lid.
Vega imposes no special requirements for mains installation over and above standard good practise in using
switchmode power supplies:
1) Use either twisted cable of about 1 twist per centimetre or standard sheathed mains cable. Efficiency of a Vega
power supply is typically 75% (depends on the configuration). Efficiency is slightly worse with many low voltage / high
current outputs and slightly better with high voltage outputs. Input power will be 1 / (efficiency) times greater than the
specified output power. Use 75% as an estimate and consult technical sales for more accurate efficiency estimate if it
is vital.
2) Avoid running the input mains cable near to the DC output cables. This is likely to cause noise pickup which result
either in generally high levels of noise on the system power rails or worse, random system errors which can be very
hard to trace and solve and poor RFI performance.
3) Pay special attention to the design of the system earth to prevent earth loops. The system earth should be
connected via a "star" network with all earth connections joining at the system earth starpoint at the input filter.
4) Vega power supplies are designed to meet EN55022 conducted RFI emissions. However, this may not remove the
requirement for an RFI filter at the system inlet due to noise picked up from looming as part of the system installation.
Cable runs within the system can pick up noise which can degrade the overall RFI performance. Also, when
connecting power supplies in parallel, each power supply will contribute it's own noise to the total emitted RFI.
Connecting Vega to the Load
The picture shows a typical Vega configuration
with faston output connections :-
Slot 5 = blank slot.
Slot 4 = Single slot, Twin module (2outputs)
Slot 3&2 = Dual slot module (1 output)
Slot 1 = Single slot module (1 output)
5
4
3
2
1
Содержание V4FFS 12V12A
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