Ai-Tec recently installed a 300 kVA generator at the Motherwell Magistrate’s Court in Port Elizabeth, Eastern Cape. “This locally manufactured power plant was designed according to the court’s specifications, which demanded a reliable, low noise back-up system,” Arnold Retief, director Ai-Tec, says. “An important feature of Ai-Tec’s generators is the acoustic enclosure that reduces sound to less than 70 dB at a distance of seven metres from the unit, while running at full load.
“In light of a greater demand for reliable dependable standby power, Ai-Tec’s manufacturing and supply facility has made a substantial investment in the latest energy production technology.”
The company’s generators range from 5.0 kVA to 2,500 kVA. In the event of a mains power failure at the Motherwell Magistrate’s Court, the PLC gets a signal that there is a problem, which could be over and under voltages, single phase failures, as well as a neutral failure, and automatically starts the power plant. When grid power comes on again, a signal is given to the power plant which switches automatically from emergency to mains power, only if the mains power is within acceptable set limits.
An important safety feature of these generators is a fire detection system that indicates the presence of smoke or fire inside the canopy, in a reaction time of less than 0.04 seconds.
Another safety precaution is the Canbus daisy chain communication system between the engine and the PLC, which protects the power plant from the hazards of high temperature, low oil pressure conditions. This engine technology, which is commonly used in the trucking industry, also prevents water from entering the fuelling system by means of monitoring and regulating online engine timing, turbo pressures, exhaust gas temperature, water levels and fuel consumption averages, as well as instantaneous fuel usage at variable loads.
This system allows for automatic fuel level percentage readings and the setting of user configurable fuel level alarms. Data can be relayed to an RS 232 controlled GSM modem that is interfaced with the PLC for remote generator control. An SMS facility is used to automatically communicate problems.