¶ Harmonic filter
A Harmonic Filter (Image 3.4) stabilizes the incoming power supply to the control panel and variable frequency drive (VFD) while mitigating harmonics generated when a motor ramps up its speed via the VFD. In some cases, power companies mandate their installation to protect the power grid from harmonic fluctuations that could impact other customers. When installed, harmonic filters ensure stable power delivery to the VFDs. If the Jockey pump is equipped with a harmonic filter, a dedicated button will be available on the control panel to access its settings.
The Harmonic Filter control (Image 3.6) offers three virtual operator modes: OFF, TEST, and AUTO. In AUTO mode, when a motor starts and the harmonic filter is set to AUTO, a customizable timer delay activates. This delay allows the variable frequency drive (VFD) to ramp the pump to its normal operating speed, ensuring stable operation before the harmonic filter engages. The filter activates once the pump reaches a normal operating load, as harmonics can affect power quality at this stage, and remains active until the pump enters Sleep mode or is turned off.
In TEST mode, the harmonic filter activates immediately, bypassing the timer, and remains on until switched back to OFF or AUTO. The indicator next to the timer input value displays the harmonic filter’s status, showing either On or Off.
¶ Pumps
For more specific settings pertaining to a particular pump click one of the pump links below: