R911278493
The R911278493 (DZB01.1-W720N) is an auxiliary bleeder developed by Bosch Rexroth Indramat. Compatible with the DKR 4.1 series of drive controllers, it plays a key role in controlling and monitoring electric motors, helping to prevent overvoltage by ensuring a secure connection to sub-grounded three-phase systems via an isolating transformer. The part number features an "E", suggesting this bleeder can be externally attached to the drive controller. Also, the auxiliary bleeder uses an internal air circulation for cooling, facilitated by a built-in blower with a current rating of 0.22A and a voltage rating of 24VDC +/-20%.
The device boasts a peak power rating of 200kW and a continuous power rating of 3kW, with the X7 connector manifesting as 'Emergency bleeder working' when the internal contact is closed and 'Emergency bleeder overload' when open. The bleeder is IP 20 rated as per the IEC 529 or EN 60529 specifications for its robust protection. It functions as a brake resistor, halting drive controller operation without the bleeder and displaying an error message. It has a resistance of 1.8 Ohms and is rated to operate between 5°C and 45°C, but can be transported and stored between -30°C and 80°C.
