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.
- Do not switch the voltage supply on or off more often than once per minute.
- 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 notes on the required protective measures for the braking resistor used in the product manual > chapter Protection against thermal overload of the braking resistor.
Inverter | Braking resistor | Protective element/ | Line contactor |
|---|---|---|---|
Sizes 1 – 3 | No braking resistor | - | No |
BW... flat design | - | No | |
BW... as PTC | - | No | |
BR… | External bimetallic relay | Yes | |
BW...-T | External bimetallic relay | Yes | |
From size 4 | No braking resistor | - | No |
BW... flat design | - | No | |
BW... as PTC | - | No | |
BR… | External bimetallic relay | No | |
BW...-T | Temperature contact | No |
If a braking resistor is connected to the inverter from size 4 without using a line contactor, an external DC 24 V voltage supply must be provided on the inverter.
