MT-30
Installation, Operation & Maintenance
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AeroVironment, Inc
Constant Voltage Source
In Voltage Mode, the MT-30 regulates the voltage of a given DC output channel.
The load may draw current from the MT-30 at the regulated voltage and the
voltage level may be varied on demand, as with a conventional DC power
supply. In addition, the MT-30 allows the user to define voltage, current and
power limits to protect the load and maintain safe operating conditions. The MT-
30 also allows for bi-directional power flow (
i.e.,
it allows the load to discharge
current back to the utility), unlike standard power supplies.
Constant Current Source
In Current Mode, the MT-30 regulates the current of a given DC output channel.
As in constant Voltage Mode, the load may draw or provide current bi-
directionally subject to user-defined limits.
Battery Quick Charging
Battery charging algorithms vary considerably depending on many factors. A
basic quick charging algorithm involves charging the battery at a constant current
rate (i.e., the maximum charge rate) until a certain voltage level is reached and
then maintaining that voltage level while the charge rate decreases to a trickle
charge. This can be accomplished very simply with the MT-30.
By setting the correct upper voltage limit and operating the system in constant
Current Mode, the user can assure that the MT-30 will charge the battery at the
desired current until its voltage rises to the limit and will then maintain that
voltage. No manual adjustment is needed during the test.
More complicated battery charge algorithms can be achieved by modifying the
operating limits, modes and command values as the test proceeds. Such
algorithms can be implemented manually or they can be programmed and run
automatically using the MT-30 Remote Operation System
.
Battery Pack and Short String Cycling
Battery packs used in electric vehicles (EV) endure constantly changing
demands. As the vehicle accelerates and brakes, the battery may go from rapid
discharge to charge and back again in a matter of seconds. In addition, the daily
driving and charging of an electric vehicle puts the battery through a large
number of deep discharge cycles, resulting in shortened battery life.
Because of these factors, EV battery pack testing is highly important but also
very difficult. Simulating the demands of an electric vehicle on a battery pack
requires computer controlled testing with a highly accurate and responsive
battery cycling system.
The MT-30 was designed specifically to handle the demands of low voltage/high
current EV battery pack and short string cycling. Using the MT-30 Remote
Operating System, USABC compliant tests can be developed and run to verify
battery pack adherence to requirements. Repetitive use of these automated
compliant test profiles can be used for comparative research as well as
production level testing.
Battery Emulation
