Schaffner Ecosine ® Economy Line FS 42842 Compact Passive Harmonic Filter

2. Engineering rules for parallel connection of multiple loads and filters

In practical power distribution design, it is common to encounter multiple nonlinear loads connected in parallel. Schaffner offers two solutions:

Single filter for multiple loads: Several motor drives can be connected in parallel to a filter, provided that the rated power of the filter is equal to or greater than the sum of the power of the connected drives. It is strongly recommended to use drivers with built-in DC reactors to achieve the best governance effect.

Filter parallel mode: When the total required power exceeds the maximum rated value of a single filter (such as over 200kW) and non-standard customized solutions are not desired, two or more filters can be connected in parallel. The engineering red line is that filters with equal rated power must be used in parallel to ensure equal current flow between internal reactors. Parallel connection of filters with unequal power can cause overload and burnout of low impedance branches.

3. Mechanical dimensions and electrical terminal specifications

To accommodate the depth limitations of different cabinets, the FS 42842 series offers 5 mechanical size architectures:

The most compact FS 42842-10 to -16 models, with dimensions of only 390 × 185 × 190mm, are suitable for small control boxes with limited space.

The largest FS 42842-260 to -320 models, measuring 700 × 450 × 385mm, typically require independent standard electrical cabinets for installation.

In terms of wiring terminals, the document provides extremely detailed torque parameters from small power 16 AWG (1.5 mm ²) to large power 1/0 AWG (50 mm ²), such as a 35 mm ² wire diameter corresponding to 7-8 Nm of torque. Strictly adhering to these torque values is crucial to prevent local overheating caused by poor contact. In addition, all external wiring must use UL rated fuses for short-circuit protection.

System Requirements and Disclaimer: Must Read Notice for Professional Engineers

Any high-end passive component has preconditions for its operating environment. To achieve the promised<10% THDi metric in the data manual, FS 42842 must meet the following system level requirements:

Power grid voltage distortion rate (THDv)<2%: If the factory's superior power grid already has severe voltage distortion, passive filters may experience resonance amplification and fail to achieve the expected filtering effect.

Three phase voltage imbalance<1%: Severe three-phase imbalance can cause saturation of the internal inductance of the filter, leading to magnetic bias risk.

At the same time, following industrial product compliance practices, Schaffner declared a standard disclaimer at the end of the document: the applicability of the product is ultimately determined by the customer and must never operate beyond the published specifications. This reminds integrators that under extreme working conditions (such as a decrease in heat dissipation capacity due to an altitude exceeding 1000 meters, or a frequency deviation of 50Hz), corresponding derating conversion is required.