The Secret to Longer Motor Life
One of the key challenges faced by industries today is the damage caused by high voltage spikes and reflected wave phenomena in Variable Frequency Drives (VFDs). Hammond Power Solutions (HPS) has addressed this critical issue with the innovative Centurion D dV/dT Filters. Here’s how HPS Centurion D dV/dT Filters filters can make a significant difference in your operations.
Understanding dV/dT and Its Impact on Motors
The term “dV/dT” refers to the change in voltage over time, a common occurrence in VFDs due to the rapid switching of square wave pulses. These pulses, when traveling through cables to motors, can cause reflected wave voltages, resulting in voltage spikes that can be more than twice the VFD’s DC bus voltage. Such spikes, especially in long cable applications, can cause premature motor insulation failures, leading to unplanned downtime and significant revenue losses.
HPS Centurion D dV/dT Filters: Your Solution to Voltage Spikes
The HPS Centurion D dV/dT filters are designed to mitigate the high-frequency ringing and voltage spikes between the VFD and motor. By combining an inductor and parallel resistor network, these filters effectively slow down the rate of voltage increase (dV/dT) and minimize damaging peak voltages within the motor’s windings and along the length of the cables.
Key Benefits of HPS Centurion D dV/dT Filters
- Enhanced Motor Protection: These filters provide superior protection by reducing the peak voltage seen by the motor and lowering the rise time of voltage pulses, thereby mitigating the effects of reflected wave voltages.
- Extended Motor Life: By minimizing insulation stress and high peak voltages, the Centurion D filters help in extending the life of motors, reducing maintenance costs, and avoiding unexpected operational downtimes.
- Versatile Applications: Ideal for applications with long cables between the VFD and motor, such as oil & gas pumps, wastewater treatment plants, HVAC systems, pulp & paper industries, and irrigation fields.
Typical Performance and Specifications
- System Voltage Rating: Up to 600V (480V-600V applications)
- Current Rating: 2A to 750A
- Inverter Switching Frequency: 2kHz to 4kHz (consult Vision Control & Automation for higher frequencies)
- Motor Lead Length: Up to 1000ft
- Voltage Drop: <3%
- Peak Voltage at Motor: 150% of DC bus voltage
Environmental and Installation Considerations
HPS Centurion D dV/dT filters are designed to operate in various environmental conditions, with open and enclosed styles available. They are built to function efficiently up to 50°C in open style and up to 40°C in enclosed style environments, with natural convection cooling. These filters are also suitable for altitudes up to 1000M.
Investing in HPS Centurion D dV/dT filters is a strategic decision to enhance the efficiency, reliability, and longevity of your motor systems. By mitigating the damaging effects of reflected wave voltages and reducing insulation stress, these filters ensure smooth and uninterrupted operations, saving you from costly downtimes and repairs.