Bosch Rexroth IndraDyn S - MKE Project Planning Manual

90/131 Bosch Rexroth AG | Electric Drivesand ControlsRexroth MKE Synchronous Motors | Project Planning ManualOperating Conditions and Application Notes9.11 Holding Brakes (Ex)9.11.1 Holding Brake Electrically ReleasingOperation of the holding brakes of IndraDyn S motors is based on the "electricalrelease" principle. Non-operative closed holding brakes open once the operatingvoltage is applied.The voltage supply of the holding brake has to be designed so as to guaranteeunder the worst installation and operation conditions that a sufficient voltage of24 Volt ±10 % is available at the motor in order to ventilate the holding brake.(see also Rexroth IndraDrive drive system DOK-INDRV*-SYSTEM*****-PRxx-EN-P chapter "Control voltage specification")The switching voltage arriving at the motor is influenced by thelenght of the cable as well as by its characteristics, such as e.g. theresistance.●●For power cables designed for Bosch Rexroth up to a max.length of 50 m, a minimum voltage of 22.8 V (24 V - 5 %) isrecommended on the drive control device..For power cables designed for Bosch Rexroth longer than50 m, a minimum voltage of 23.4 V (26 V - 5 %) is recommendedon the drive control device.t 1t 2Fig.9-21:Connection timeDisconnection timeHolding brake diagramThe electrically-released holding brake is used to hold the axes at a standstilland when the ”controller enable” signal is off. If the power supply voltage failsand the controller enable signal is turned off, the electrically-released brake willautomatically shutdown.Do not use the holding brake as an operational brake for movingaxes.If the holding brake is engaged repeatedly on a drive in motion or the ratedbrake torque is exceeded, premature brake wear can occur.9.11.2 Holding Brakes Notes Regarding SafetyObserve the safety requirements during the system design.