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 preventive measures for the braking resistor used in the Product manual > chapter BW.. braking resistors > "Protecting the braking resistor against thermal overload".
Inverter | Braking resistor | Protective element/preventive measure | Line contactor required? |
|---|---|---|---|
Size 0S, 0L, 3 | No BW.. | – | No |
BW.. Flat design | – | No | |
BW.. as PTC | – | No | |
BW.. | External overload relay | Yes | |
BW..-T | External overload relay | Yes | |
From size 4 | No BW.. | – | No |
BW.. Flat design | – | No | |
BW.. as PTC | – | No | |
BW.. | External overload relay | No | |
BW..-T | Temperature contact evaluation | No | |
External overload relay | No |
- 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.
- If a braking resistor is connected to inverters from size 4 without using a line contactor, an external DC 24 V voltage supply must be provided on the inverter.
