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Load recorder
Author(s)
Waja, Aadil Ahmed
Date Issued
1987
Type
Thesis
Publisher
Cape Technikon
Abstract
This thesis describes the development of a computerized
Load Recorder. The load recorder is used by the Cape Town
City Council to assist in the tariff investigation of
electricity consumers. This investigation assists the
consumers in selecting the best cost effective electricity
tariff. It also motivates the consumers to maintain a
constant load which in turn assists the Council in supplying
the required electricity.
The load recorder replaces a manual and time consuming
method used in conducting the tariff investigation. The
development of the load recorder involved the design of
hardware and software. It was designed in a compact
enclosure to hook up to the electricity meters of the
consumer for a period of 7 days. The software was designed
in the 6805 assembly language to log data and record the
electricity load every 15 or 30 minutes for this period. At
the end of this period the data is downloaded into the HP85
personal computer.
A basic program was designed for the HP85 to analyse
and compute the downloaded data. A graphical representation
and analysis is printed by the HP85 computer. The given
graph of the results represents the electricity used for
this period. The tariff rates are analysed and calculated
to determine the best cost effective tariff. A CMOS micro computer intergrated circuit was chosen
due to the determined specification of the load recorder.
In order to make the development of the load recorder
possible an aid (tool) had to be designed and built for the
chosen microprocessor. This development aid, the emulator,
is included as part of this thesis.
The Motorola exorciser only supported a cross assembler
for the chosen microprocessor family. The emulator was
designed and built to enable testing and debugging on the
Exorciser. The development on the emulator involved a
detailed analysis of the Exorciser development system. The
emulator was designed using hardware and software. The
hardware emulator board was designed as a standard Motorola
size card which plugs into the Exorciser. The software was
designed for the 6809 exorciser and for the 6805 emulator.
The emulator was soak tested and debugged during the
development of the load recorder.
The emulator opened further avenues for future
microcomputer design projects especially where a confined
area and compactness is an important factor.
The design and development of the emulator and the load
recorder was conducted in the Computer Section of the City
Electrical Engineer's Department of Cape Town.
Load Recorder. The load recorder is used by the Cape Town
City Council to assist in the tariff investigation of
electricity consumers. This investigation assists the
consumers in selecting the best cost effective electricity
tariff. It also motivates the consumers to maintain a
constant load which in turn assists the Council in supplying
the required electricity.
The load recorder replaces a manual and time consuming
method used in conducting the tariff investigation. The
development of the load recorder involved the design of
hardware and software. It was designed in a compact
enclosure to hook up to the electricity meters of the
consumer for a period of 7 days. The software was designed
in the 6805 assembly language to log data and record the
electricity load every 15 or 30 minutes for this period. At
the end of this period the data is downloaded into the HP85
personal computer.
A basic program was designed for the HP85 to analyse
and compute the downloaded data. A graphical representation
and analysis is printed by the HP85 computer. The given
graph of the results represents the electricity used for
this period. The tariff rates are analysed and calculated
to determine the best cost effective tariff. A CMOS micro computer intergrated circuit was chosen
due to the determined specification of the load recorder.
In order to make the development of the load recorder
possible an aid (tool) had to be designed and built for the
chosen microprocessor. This development aid, the emulator,
is included as part of this thesis.
The Motorola exorciser only supported a cross assembler
for the chosen microprocessor family. The emulator was
designed and built to enable testing and debugging on the
Exorciser. The development on the emulator involved a
detailed analysis of the Exorciser development system. The
emulator was designed using hardware and software. The
hardware emulator board was designed as a standard Motorola
size card which plugs into the Exorciser. The software was
designed for the 6809 exorciser and for the 6805 emulator.
The emulator was soak tested and debugged during the
development of the load recorder.
The emulator opened further avenues for future
microcomputer design projects especially where a confined
area and compactness is an important factor.
The design and development of the emulator and the load
recorder was conducted in the Computer Section of the City
Electrical Engineer's Department of Cape Town.
Additional information
Thesis (Masters Diploma (Electrical Engineering)) --Cape Technikon, Cape Town, 1987
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Load recorder.pdf
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