EN / ACS800-31/U31 Hardware Manual - Simark Controls

54If there are power factor compensation capacitors in parallel with the three phaseinput of the drive:1. Do not connect a high-power capacitor to the power line while the drive isconnected. The connection will cause voltage transients that may trip or evendamage the drive.2. If capacitor load is increased/decreased step by step when the AC drive isconnected to the power line: Ensure that the connection steps are low enough notto cause voltage transients that would trip the drive.3. Check that the power factor compensation unit is suitable for use in systems withAC drives i.e. harmonic generating loads. In such systems, the compensation unitshould typically be equipped with a blocking reactor or harmonic filter.Equipment connected to the motor cableInstallation of safety switches, contactors, connection boxes, etc.To minimize the emission level when safety switches, contactors, connection boxesor similar equipment are installed in the motor cable between the drive and themotor:• EU: Install the equipment in a metal enclosure with 360 degrees grounding for theshields of both the incoming and outgoing cable, or connect the shields of thecables otherwise together.• US: Install the equipment in a metal enclosure in a way that the conduit or motorcable shielding runs consistently without breaks from the drive to the motor.Bypass connectionWARNING! Never connect the supply power to the drive output terminals U2, V2and W2. If frequent bypassing is required, employ mechanically connected switchesor contactors. Mains (line) voltage applied to the output can result in permanentdamage to the unit.Before opening a contactor (DTC control mode selected)Stop the drive and wait for the motor to stop before opening a contactor between theoutput of the drive and the motor when the DTC control mode is selected. See theappropriate ACS800 application program firmware manual for the requiredparameter settings. Otherwise, the contactor will be damaged. In scalar control, thecontactor can be opened with the drive running.Planning the electrical installation