System Technology (Pty) Ltd.
Reg. No. 91/07159/07
GREEN BEAN supplies
control and monitoring systems using programmable controllers and
custom-written PC software.
We have a small range of South African designed and
manufactured programmable controllers. These may be networked using Rs232 or
Rs422. These are programmed to suit the customerís requirements. See the W-Series Controller.
Green Bean has developed its own Supervisory Control
and Data Acquisition (SCADA) program. This has been written using Microsoft
Visual Basic and uses Microsoft Access as a convenient, no-extra-cost database.
See Green Bean SCADA.
We are well experienced in electrical maximum demand
control. We implement intelligent load shedding in a way that does not
interfere with production, and juggle available electricity between machines.
See the MAXCON Controller.
Some of our successful projects:
- At the Johannesburg City
Deep Abattoir, 21 controllers are networked to control the refrigeration
plant and about 30 cold-rooms, with a MAXCON controlling the electrical
consumption of the plant. A Green Bean SCADA system monitors the plant.
- In Durban, two
refrigeration sites at Bayhead and at Maydon Wharf are linked through a
Green Bean SCADA system. About 17 controllers control 2 refrigeration
plants and about 10 very large freezer and chiller storage rooms. One
MAXCON controls maximum demand at Bayhead, and a second MAXCON has been
proposed for the Maydon Wharf site. The linked system allows one engineer
to monitor both sites from either site.
- Near Durban at two of
Rainbow Farms chicken hatcheries W-Series controllers are being used to
replace warn-out control panels on the incubators, and a Green Bean SCADA
system monitors and logs temperatures in the incubators. To date about 16
out of 55 incubators have been converted. At the one site a MAXCON
regulates the maximum electrical demand.
- In Pretoria at ARMSCOR
House, (a huge building,) we are currently installing a new Green Bean
SCADA system and a MAXCON for maximum demand control, and replacing the
control system on some of the refrigeration plant and air-handling units.
About Green Bean System
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