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B&R 7AO352.70 Driver module

If Start Mode (2.09) = Start from Zero is set and the RUN command is output again during stopping this command will be ineffective, i.e. the drive will not start again by itself after the minimum speed has been reached. Only if the RUN command is reset and set again during standstill the drive can be started again. Switching off with emergency stop In addition to ON or RUN the drive can be stopped with the Eme Stop command. The procedure is as follows with the default values: The falling edge of the Eme Stop command generates the warning Eme Stop Pending (A09). At the same time the drive is braking on the ramp set with Eme Stop Ramp (5.11) until the actual speed has fallen below the speed set with Zero Speed Lev (5.15) (minimum speed). Current and speed controllers are blocked, the main contactor, the fans and the field supply are switched off and thereby the drive is disconnected from the mains. Neither the ON nor the RUN command is effective in this phase. Only upon reaching the minimum speed, can the drive be restarted with the rising edge of the ON and the RUN command. Switching off behaviour at emergency stop Eme Mode Stop (2.04) allows the selection of other switching off modes than those provided by the default setting.

If Eme Stop Mode (2.04) = Torque Lim is set the internal speed reference value is set to 0 rpm and the drive will brake along the torque or current limit via the speed controller. this requires the balancing of the speed controller before braking. The pulses are blocked, the main contactor, the fans and the field supply are switched off and thereby the drive is disconnected from the mains after the minimum speed has been reached.

Special cases 

When the stop command (RUN = 0) is present the drive may change to the following events of higher priority which may occur: Comm Fault Mode (2.07) or Eme Stop Mode (2.04) with Eme Stop Mode being able to interrupt Comm Fault Mode. While the drive is being stopped in accordance with Comm Fault Mode (2.07) or Eme Stop Mode (2.04), an Off command (ON = 0) is prevented and vice versa.Neither the ON nor the RUN command is active in this phase. Only upon reaching the minimum speed, can the drive be restarted with the rising edges of the ON and the RUN command. If Eme Stop Mode (2.04) = Coast is set the pulses will be blocked, the main contactor, the fans and the field input will be switched off and thereby the drive will be disconnected from the mains. The drive is coasting without control. Neither the ON nor the RUN command is effective in this phase. Only upon reaching the minimum speed, can the drive be restarted with the rising edges of the ON and the RUN command.

Coasting via field bus communication The coast bit (COAST) in the control word allows the drive to be de-energized as quickly as possible. The falling edge blocks the pulses, switches off the main contactor, the fans and the field supply and thereby disconnects the drive from the mains. The drive is coasting without control. The coast command (COAST) is executed internally with the highest priority and has the same effect as emergency stop if Eme Stop Mode (2.04) = Coast is set.