35[Preparations]PreparationsThe brake is to hold a work (movable part) and prevent it from dropping by gravity when power to the servo is shutoff for the purpose of driving a vertical shaft in the servo motor.1. A brake coil has no polarity.2. A customer is requested to provide for power supply for the brake. In addition, do not use power supply forcontrol signals (VDC ) for driving the brake.3. In order to suppress surge voltage due to ON/OFF operation of the relay (RY), install a surge absorber. Whenyou’re using a diode in place of a surge absorber, note that start of the servo motor is delayed in comparison withwhen the latter is used.4. For a surge absorber for the brake, refer to “Recommended Parts” on Page 192 of Reference edition.5. The recommended parts are those specified for measuring brake release time. In some cases, reactance ofelectric wires may vary depending on wire length, causing sporadic rise of voltage. Select a surge absorber sothat the relay coil voltage (maximum rating: 30V, 50 mA) and voltage between brake terminals do not exceed arated value.BRK-OFF Signal Output Timing• For timing of brake release upon power-on or that of brake operations in case of servo-off/alarm while the motoris rotating, refer to “Timing Chart” on Page 32.• In case of Servo-OFF or alarm while the motor is rotating, you can set with the parameter (i.e., Pr6B: Mech.break action set-up at motor in motion) time till BRK-OFF signal turns off (i.e., the brake is actuated) after themotor is freed from energized state. For details, refer to “Parameter Settings” of every control mode.1. The servo motor with built-in brake could result in brake lining sound (Chattering, etc.) while it is running. But thisis not a problem.2. When the current is fed into the brake coil (with the brake kept released), it could result in leak magnetic flux fromthe shaft, etc. Be careful when a magnetic sensor, etc. are used around the motor.Wiring (Example)This circut shows an examplein which a brake release (BRK-OFF)signal from the driver is used tocontrol the brake.The brake built in the servo motor is only for holding, namely, maintaining,stopped condition. Thus, you must not use it for “braking” to stop moving load.DriverSurge absoberCut off upon emergency stopMotorBrake coilBRK-OFF1113RYCOM-V DCRY12~24VPower for brakeDC24VCN X5Fuse(5A)Holding BrakeSpecifications of Holding Brake• Excitation voltage should be DC24V ± 10%.*1 A value when the surge absorber is used.Values given in ( ) are actual values measured with diodes (V03C manufactured by HITACHI Semiconductorand Devices Sales Co., Ltd.).• The values in the above table are representative characteristics (except static friction torque, releasing voltage,and excitation current).• A backlash of the brake is ± 1˚ of a setup value.• Allowable angular acceleration of MUMA series: …..10000 rad/s2• Service life of the number of accelerations/decelerations with the allowable angular acceleration is 10 milliontimes or greater. (The number of accelerations/decelerations till backlash of the brake changes drastically.)MotorSeriesMUMAMotor Output50W, 100W200W, 400WStatic FrictionTorque (N/m)0.29 or higher1.27 or higherInertiax 10 -4kg•m 20.0030.03Intake Time(ms)25 or shorter50 or shorterRelease Time(ms)*120 orshorter(30)15 or shorter(100)ExcitationCurrent DC A(during cooling)0.260.36ReleaseVoltageDC1V orhigherAllowableWorkload perBraking J39.2137TotalAllowableWorkloadx 10 3 J4.944.1Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: CustomerService@valin.com
