Using the line contactor
Proceed as follows:
- Always place the line contactor before the line filter (if present).
- Use at least one contactor of utilization category AC‑3 (EN 60947-4-1) as a line contactor.
- After switching off the voltage supply, keep it switched off for at least 10 s.
- With 3-phase devices, do not switch on the voltage supply more frequently than once every 60 seconds.
- With 1-phase devices, do not switch on the voltage supply more frequently than once every 120 seconds.
- Do not use the line contactor for jog mode, but only for switching the inverter on and off.
The following table provides an overview of when a line contactor is required. Observe the information on the necessary protective measures for the braking resistor used in the Product manual > chapter Protecting the braking resistor against thermal overload.
Braking resistor | Protective element/ | Line contactor required? |
|---|---|---|
No BW.. | – | No |
BW.. flat design | – / External overload relay | No / Yes |
BW.. as PTC | – | No |
BW.. | External overload relay | Yes |
BW..-T | Temperature contact evaluation | Yes |
Note that with flatpack resistors, the internal thermal protection is only effective at line voltages ≥ 380 V. For line voltages < 380 V, the protection of the braking resistors against overload and overtemperature can only be ensured otherwise, e.g. with a customer-supplied thermal overload relay.
