Bosch Rexroth IndraDyn S - MKE Project Planning Manual

92/131 Bosch Rexroth AG | Electric Drivesand ControlsRexroth MKE Synchronous Motors | Project Planning ManualOperating Conditions and Application Notes9.11.4 Layout of Holding BrakesHolding brakes on motors of Rexroth are basically not designed for servicebraking. The effective braking torques are different in static and dynamic operationfor physical reasons.Normal operation and EMERGENCYSTOPFault conditionDynamic sizingProject planning recommendationIn normal operation, using the holdingbrake for clamping of a standstill axis, the"static holding torque" (M4) - adhesive frictionapplies.In case of EMERGENCY STOP for the desactivationof an exis (n < 10 min -1 ), a"dynamic holding torque" (M dyn ) – slidingfriction is effective.Fig.9-22:M4 > M dynUnder a fault condition, using the holdingbrake for the desactivation of a moving axis(n ≥ 10 min -1 ), a "dynamic holding torque"(M dyn ) – sliding friction is effective.Therefore, note the following description of dynamic sizing.Dynamic sizingThe load torque must be smaller than the minimum dynamic torque M dyn whichthe holding brake can provide. Otherwise the dynamic holding brake torque isnot sufficient to stop the axes.If a mass is to be decelerated in a defined time or in a defined route, the additionalmass moment of inertia of the whole system must be taken into account.To ensure the system's safety, reduce the required holding torque to 60% ofthe static holding torque (M4) of the holding brake.9.11.5 Holding Brake–Commissioning and Maintenance InstructionsBefore initial commissioningIn order to ensure proper functioning of the holding brake, it must be checkedbefore the motors are installed.Measure the holding torque (M4) of the holding brake. If necessary, grind in theholding brake.Measure the holding torque (M4) of the holding brake1. De-energize the motor and secure it against re-energization.2. Measure the transferable holding torque (M4) of the holding brake with atorque wrench. Holding torque (M4) see "Technical Data".●●If the holding torque (M4) indicated is achieved, the motor is readyfor the assembly.If the holding torque (M4) indicated is not achieved, the subsequentgrinding process can be used to reconstitute the holding torque.Grinding in the holding brake1. At closed holding brake, turn the output shaft by hand, e.g. with the helpof a torque wrench, by about 5 revolutions.2. Measure the holding torque (M4).●If the holding torque (M4) indicated is achieved, the motor is readyfor the assembly.