SUPERIOR SOLUTIONS WITH V1K
As Pulse Width Modulated (PWM) Drives are incorporated into various applications and processes, the increased energy savings and decreased maintenance on Drives can be offset by increases in Motor failures.
The KLC-Series V1k product family has been designed as an engineered solution for motor failures due to the reflected wave phenomenon.
REFLECTIVE WAVE PHENOMENON
Voltage wave reflection is a function of the voltage rise time (dv/dt) and the length of the motor cables.
The impedance on either end of the cable run does not match, causing voltage pulses to be reflected back in the direction from which it arrived. As these reflected waves encounter other waves, their values add, causing higher peak voltage.
As wire length or carrier frequency increases, the overshoot peak voltage also increases.
Peak Voltages on a 460V system can reach 1200 to 1600V, causing rapid breakdown of motor insulation, leading to motor failure. On 575V systems, the peak voltages can easily reach 2100V. If this is left uncontrolled, insulation failure may occur.MITIGATE REFLECTIVE WAVE
- By combining a patented dampening circuit with a low pass filter, V1k filters:
- Increase the voltage rise time (dt out of dv/dt)
- Prevent voltage spikes from exceeding 1,000 V
- Slow pulse transitions, reduce dv/dt
- Protect motor and cable insulation
REDUCES COMMON MODE MOTOR AND BEARING CURRENTS
- Common Mode current, which leads to bearing pitting and bearing fluting, is reduced by a minimum of 30%. V1k filters:
- Slow down the pulse dv/dt by a factor of 3, reducing the harmful common mode currents
- Increase bearing life and up-time
- Reduce common mode noise and currents
The V1K prevents voltage spikes from exceeding 1,000 V up to 2,000 feet and limits dv/dt to less than 1,000 V/ μs. The product has been used successfully in applications up to 3,000 feet depending on cable and VFD sizes.
