Double Isolation: A preferred method for noisy environments
Power Lines and Transformers
Power lines should be assumed to have transient voltages on them. In wiring an AC line to your electronics, employ devices which will isolate those electronics from the AC power line. Generally this will be a transformer. A transformer should be provided in the AC power connection to your electronics, even if no reduction in voltage is needed. It will be best if the transformer selected is an isolation transformer, designed especially to provide maximum isolation. If your installation is subject to severe voltage transients from the AC power line, (from variable speed motor drives, for example, or servo/spindle motor drive amplifiers), the double isolation technique illustrated here is strongly recommended.
Isolation Transformer eliminate such noises and attenuates the spikes to minimal values, providing complete protection against such electrical disturbances. It consists of double wound Transformers with Extremely low coupling capacitance to isolate the voltage spikes and reduce noise from mains with extremely high insulation resistance. The turn ratio of Isolation transformer is 1:1. It is generally installed with the separate machines.
Switching of Electrical Equipments in industrial and commercial Generates spikes up to 10000 Volts and high frequency Noises thus disturbing the sine wave output. The spikes can cause the failure of Thyristor, Microprocessor or other sensitive devices.
The High frequency noise can interface with digital – Electronic Equipments Causing data corruption erratic behaviors, loss of memories etc…
Business and industry is more dependent than ever on sophisticated electronics. Modern electronic control devices are frequently the most cost effective way to achieve real improvement in the performance of production machines and processes. Devices such as Computer Numerical Controls (CNC), Programmable Logic Controllers (PLC), as well as the various programmable motion controllers currently available for robotics applications offer unprecedented functionality and power, and are available at attractive prices.
Damage, Resets and Lost Data
Unfortunately, many owners who make the decision to retrofit these control devices do not achieve the full benefit of the upgrade. If your electronics are not properly installed and protected from electrical transients, one or more of the following may occur:
- Physical damage to the electronics.
- Processor resets, leading to program interruption and/or (in the case of CNC devices) loss of machine position register information.Loss or corruption of program or data
1K1KVA - 200 KVA)