The photograph on the previous page shows a unit manufactured in 2002. This had an output of over 60kW DC, and was one of a pair of identical units. We are currently building a 100kW unit with dual outputs of 600V and 50V DC output at 150A each.
The charger section is rated continuously at 30 Deg C ambient, and is a fully-controlled thyristor system for three-phase
operation. Single phase operation is possible up to 40kW where 3-phase supplies are not available.
The chargers have various BOOST and FLOAT operation options. All settings are adjustable.
Output smoothing is standard on all our chargers, and the units will operate without battery if required, as stand alone power supplies.
Wiring is heavy-duty flexible stranded type with hexagon-crimped copper-tube terminals onto bolted connections throughout.
Indicators are provided for AC ON, CHARGE, INHIBIT, FAULT, plus BOOST and FLOAT if fitted. Mains isolator and output control switches are provided, and input phase detection and failure monitoring is usually provided.
The main components including the transformer, choke, capacitors, thyristor stack and heatsink are all grouped inside
the main chassis for protection, and the whole assembly is covered by a 2mm sheet steel body and cover. All parts are rated for long and continuous operation and have some reserve in hand over and above their continuous rating requirements.
We recommend that batteries have no more than 4 X the rated output of the charger for a fast charge, or up to 10 X the rated output for slow and
overnight charging (40AH and 100AH for a 10A output charger.)
Any output voltage, any output current up to 100kW total output power.
© Prepair Ltd 1990-2004 E&OE
TECHNICAL DESCRIPTION.
The CVT552 series chargers comprise a high-power, fully rated constant voltage charger, built in a steel framework/casing which is designed to be floor mounted in a permanent installation. Fixing holes are provided and cable access is to DIN rail terminal blocks.
CONSTRUCTION
The system is built around a box-section steel frame, with 3mm sheet steel chassis, to which all the main components are bolted.
(We do not use anything other than threaded fasteners, and all are either stainless steel or zinc plated)
AC POWER SUPPLY
All high-power chargers use 415/440V 3-phase supplies, we can supply single-phase up to about 40kW.
BATTERY TYPES AND CAPACITIES
The chargers will operate on any type of battery that will accept the rated output of the charger. Typically, vented Lead-Acid and Nickel-Cadmium
types are usual, most applications comprise these battery types. The charger will also charge NIFE and Lithium-Ion batteries of suitable voltages and capacities.
CONNECTIONS.
The standard units have internal DIN rail terminals. Alarm functions are provided.
TYPICAL USERS
CVT552 units are in service in the UK for various utilities and users. The voltage ranges available are shown below,
plus we are able to offer a customised output voltage and current range for OEM customers.
STANDARD VOLTAGES & OUTPUT CURRENTS
The chargers are available with the following standard outputs:
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