Schaffner Group
User and Installation Manual
Ecosine
max
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ii.
Performance Guarantee
By selecting and installing the appropriate ecosine max passive harmonic filter in a variable frequency
AC drive application (variable speed drive application) within our published technical specifications, we
guarantee that the input current distortion will be less than or equal to 5% THDi for standard ecosine
max series filters at rated power. Ecosine max filters can also provide similar performance in other
drive applications such as constant torque, DC drives or other phase controlled rectifiers, e.g. SCR
drives, but actual THDi levels can vary by load and/or speed and/or firing angle of thyristors and there-
fore cannot be guaranteed. Consult Schaffner or our local representative for assistance when applying
ecosine filters on these types of equipment.
iii.
Minimum system Requirements
The guaranteed performance levels of this filter will be achieved when the following system conditions
are met:
|
Type of load: Any 3-phase equipment with front-end six-pulse diode rectifier, with or without
DC-link choke
|
Type of source: 3-phase power line without neutral
|
Line impedance: <3% (calculated for the rated filter power)
|
Line frequency: 50 Hz ±1 Hz (FN 3470/71, FN 3480/81), 60 Hz ±1 Hz (FN 3472/73, FN
3482/83)
|
Line voltage: Nominal line voltage ±10%
|
Line voltage unbalance: <1%
|
Line voltage distortion: THDv <2%
If a properly sized and installed filter fails to meet the 5% THDi level, Schaffner will provide the neces-
sary application engineering support or filter replacement at no charge.
iv.
Important user notice
Schaffner ecosine max harmonic filters are designed for the operation on the input (grid) side of power
electronic equipment with six-pulse rectifier front-ends in balanced three-phase power systems, like
typically used in AC or DC motor drives and high power DC supplies. Filter suitability for a given appli-
cation must be determined by the user on a case by case basis. Schaffner will not assume liability for
any consequential downtimes or damages resulting from use or application of ecosine filters outside of
their specifications. Ecosine filters are not designed for single-phase or split-phase applications.
