Status and operating displays of the LED
Supply system failures (affecting one or more phases) are detected within one supply system half-wave. The regenerative power supply function is inhibited and the ready signal revoked.
The return line voltage is also detected within one supply system half-wave. It is fed back automatically into the supply system after a switch-on delay of 200 ms. The ready signal is then set again.
The supply system rectifier of the regenerative power supply always remains active.
The ready signal is revoked when a thermal overload occurs in the regenerative power supply or in the event of a power failure. This ready signal must be evaluated in order to provide thermal protection for the regenerative power supply unit.
A braking resistor must be connected to the inverter to make it possible to bring the drives to a controlled stop in case of a line interruption or power failure. This resistor is only energized during braking when there is a line interruption.
Unit status / grid status
| Response | Ready signal | Status LED (TRIP) |
|---|---|---|---|
Power failure → MDR60A.. not ready or Unit fault | Power failure is detected under load within one supply system half-wave. Immediate regenerative power supply inhibit. Input rectifier remains switched on. | Not ready for operation | Red |
Grid OK again and no unit fault
→ MDR60A.. ready | Grid OK is detected within one supply system half-wave. After a 200 ms switch-on delay Guarantees safe operation in the event of contactor chatter. | Ready after | Yellow |
