Implementing a bypass connectionIf bypassing is required, employ mechanically or electrically interlocked contactors betweenthe motor and the drive and between the motor and the power line. Make sure withinterlocking that the contactors cannot be closed simultaneously. The installation must beclearly marked as defined in IEC/EN 61800-5-1, subclause 6.5.3, for example, "THISMACHINE STARTS AUTOMATICALLY".WARNING!Never connect the drive output to the electrical power network. The connectioncan damage the drive.Protecting the contacts of relay outputsInductive loads (relays, contactors, motors) cause voltage transients when switched off.ABB highly recommends to equip inductive loads with noise attenuating circuits (varistors,RC filters [AC] or diodes [DC]) in order to minimize the EMC emission at switch-off. If notsuppressed, the disturbances can connect capacitively or inductively to other conductorsin the control cable and form a risk of malfunction in other parts of the system.Install the protective component as close to the inductive load as possible. Do not installprotective components at the relay outputs.123230 V AC+ 24 V DC4230 V AC1) Relay outputs; 2) Varistor; 3) RC filter; 4) diodeGuidelines for planning the electrical installation 69
