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In drives coupled as an electronic drive via the CNC controller, and which cannot accept an angle fault even in a power failure or an emergency stop situation. Do not use the NCB bridge in digital drives with SERCOS interface. The programmable fault response of digital drives makes a position-controlled braking possible without the NCB bridge. The NCB bridge prevents the drives from receiving the message that there is a problem in the power supply. The power is simultaneously switched off with the actuation of the emergency stop sequence. The energy contained in the drives is transformed into heat. The bleeder resistor in the KDV 4.1 can take up a maximum of 100 kWs over a five minute period. The braking of the drives takes precedence over protecting the bleeder resistor against overload. Frequent consecutive arbitrary emergency shutdowns (e.g., commissioning) can damage the KDV 4.1 and are not permitted. The dc-bus voltage is not short-circuited so that power will be available for a position-controlled braking of the drives. The CNC control brakes the drives position-controlled in an emergency stop or a signal from the control monitor of the KDV 4.1 (e.g., mains loss). The energy either stored or fed back into the link circuit must be greater than the energy required to excite the asynchronous drives, or for the retreat action.
The power contactor is immediately switched off once the emergency stop sequence is initiated. The CNC controller brakes the drives position-controlled. The drives controller enable signals must not be switched off by the power contactor. The set-point value of the drive modules to switch to zero is suppressed by the NCB bridge with trouble in the power supply. The master controller must, in any case, guarantee the shutting down of the drives. This means that the master controller must definitely evaluate the UD contact of the KDV 4 and stop the drives if the contact opens. It is otherwise assumed that the drives will slow down uncontrolled if there is a problem with the power supply.If the mains current is smaller than 3 x 380V, or, greater than 3 x 460V, then a transformer with a secondary voltage of 3 x 380V is needed. If INDRAMAT transformers are used, then transformer power must not drop below the following values: Autotransformer: DST: min. transformer power: S=10 kVA Isolating transformer: DLT: min. transformer power: S=25 kVA Scattered inductance may not exceed 0.5 mH per strand if INDRAMAT transformers are not used.