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A Rectifier turns AC mains into a DC one, usually to charge batteries and maintains them in optimal conditions, and, at the same time, supplies the DC power required by other loads. So it's very important that unit takes into account batteries to feed (Pb / NiCd).
It runs automatically, permanently evaluating batteries status, its temperature and other system parameters, in order to guaranteeing output voltage stability and low crimp factor.
Different options could be added to the basic unit, i.e.: autonomy battery end disconnection procedures, magneto thermal distribution switches, ground fault detector, mains analysers, etc.
BATTERIES CHARGE LIMITS AND LEVELS
Hermetic Pb batteries needs only two charging levels (flotation and charge), whereas open Pb and NiCd batteries needs three (flotation, fast charge and deep charge):
- Flotation charge: for battery maintenance once it's charged, accordingly to the temperature.
- Fast charge: restoring, as soon as possible, the capacity lost by the battery in a discharge. At a limited current value and stabilised final voltage charge.
- Deep charge: manual periodical operation to equalise battery's elements, carried out at a limited current value and stabilised final voltage charge. Loads must be disconnected.
From flotation charge to fast charge and vice versa:
- Automatically: when the battery absorbs a higher current than a specific value, adjustable. And the opposite, once the absorbed current falls down.
- Manual (optional): by a local/remote push button switch.
MAIN FEATURES
• automatic full wave rectifier
• high input power factor, up to 0.9
• high output voltage stability, crimp factor up to 0.1 % r.m.s.
• high efficiency, simplicity and reliability
• possible parallel operation with other units
SPECIFICATIONS (generic, to detail for each case)
Input Single-phase 220 VAC, + 15 %, - 20 %
Three-phase 220 / 380 / 400 VAC, +15%, -20%
Frequency 50 / 60 Hz, ± 5 %
Input power factor up to 0.9
Output 24 / 48 / 110 / 125 / 220 VDC, ± 0.5 %
From 10 to 10,000 A
Crimp factor up to 0.1 % r.m.s.
Efficiency up to 94%, according to power
Options Pb or NiCd batteries
6 or 12 pulse
Anti-harmonics filter
Redundant
Parallel operation with other units
Antiseismic, Class 1E
Output distribution switchboards
Control cabinets
Ground fault detector
Ground fault localizer
Mains analyser
Adaptable to different standards (MIL, UL, ...)
Design Metallic self-stable cabinet
Protection grade IP20 to IP54
Colour RAL 7032 (typical)
All the above characteristics could be modified under demand |
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