60 | SAMLEX AMERICA INC.
SECTION 4 |
General Description & Principles of Operation
4.1 GENERAL DESCRIPTION
EVO-4248SP is a Low Frequency Type, Pure Sine Wave, 120 / 240 VAC Split Phase Inverter-Charger with built-in
Transfer Relays
(Section 4.4.2)
. It uses high performance, 100MHz DSP (
Digital Signal Processing
) type of micro-
controller and Pulse Width Modulation (
PWM
) control. It is Bi-Directional i.e. it uses a
common Converter Section
consisting of Low Frequency, Bi-directional AC input / output Transformer
(T-1, Fig 3.13)
and Mosfet based
H-Bridge that can work in two directions as follows:
1)
AC to DC Charging Mode:
The common Converter Section is used to convert external AC input power to
DC output power to charge the batteries and at the same time, pass through the AC input power to the AC
loads
2)
DC to AC Inverting Mode:
The common Converter Section is used to convert DC input power from the
batteries to AC output power to feed the AC loads
The above Bi-Directional implementation allows the same power components to be used in both directions
resulting in high- energy transfer efficiency with fewer components and higher reliability
i
INFO
Please note that as the unit is Bi-Directional with a common Converter Section as explained, it cannot
work as inverter and charger at the same time
4.2 COMPONENTS OF THE SYSTEM
It consists of 3 Sections – Inverter Section, Battery Charger Section and AC Input/Transfer Relay Section. The unit is fed
with the following inputs:
(i) Either 120 / 240 VAC Split Phase, 60/50Hz
(Default: 60Hz)
or, (ii) 120 VAC Single Phase, 60/50Hz
(Default: 60Hz)
DC Battery Source consisting of 48V battery bank.
Additional external charging source: Solar Charge Controller of up to 100A capacity. The output of the external
Solar Charge Controller is routed through this unit and operates in parallel with the internal charger. The current
delivered by the external charge controller is measured in real time. The internal charging current is controlled to
ensure that the combined current fed to the battery does not exceed the programmed value of parameter "BULK
CURRENT". This improves the life of the battery. Please see Section 5.4 for more details.
4.3 INVERTER SECTION
The Inverter Section is a heavy-duty, continuous rated, DSP micro-controller based inverter generating a Pure Sine Wave
output of 120 / 240 VAC Split Phase from the DC Battery Source. It is able to supply AC power to various types of
120 VAC or 240 VAC AC loads such as resistive loads (heaters, incandescent lamps etc) or reactive loads (
motors, air
conditioners, refrigerators, vacuum cleaners, fans, pumps, Switched Mode Power Supplies (SMPS) used in audio / video
equipment and computers, etc
).
Summary of Contents for Evolution EVO-4248SP
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