electrically released brakes use form arrangements to force stationary friction plates against disks that are attached to the drive. When world power is applied to the brake coil, the resulting charismatic push compresses the springs, fully disengaging the clash plate from the harrow and allowing the motor side denture to turn freely .
It is crucial to note that with electrically released brakes, brake coils are rated for specific voltages. electric potential options include 115, 230 and 460-volt AC, and 12, 24, 90 and 230-volt DC. many brake coils require DC voltage and utilize a rectifier arrangement to convert provide AC electric potential to the gyrate ’ second DC volt requirements. To fully release the brake when powered, the full electric potential must be present on the bracken wires. This becomes most significant during practice with an AC drive-controlled motor .
AC Drive Usage with Electrically Released Brakes
AC drives are widely used to power motors and have the advantages of allowing operators to better manipulate acceleration, pull off speed and regulate deceleration. When motors begin to accelerate upon startup, motor voltage increases from zero to full operational voltage and travel rapidly. As motors reach operating focal ratio but operate below drive base accelerate, the modal voltage is lower than the full moon rated voltage. last, as motors decelerate to a check, motor voltage decreases to zero.
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If the AC drive office is connected to both motive wires and brake wires, brakes will not in full release until the AC drive reaches a electric potential high enough to disengage the friction disk. This means that the centrifugal will be held at a hold on until electric potential reaches a high enough degree to release the brake. Because of this, the AC drive may trip while the centrifugal is held at a stop, or the bracken may drag when the electric potential reaches a eminent enough horizontal surface to begin the handout. sometimes, the brake friction disk may drag if the motor is not running at full speed and the brake is not at full rated electric potential. During control deceleration, the voltage supplied to the brake will reduce until it drags, stopping the drive before motor reaches zero volts. As a leave, connecting AC drive might to motor and brake wires can reduce brake life .
When a bracken is used with a motor controlled by an AC Drive, the brake should be powered by a divide full voltage power reference. I have personally encountered OEM equipment that uses AC drives connected to both drive and brake leads. If acceleration is quick, the motor runs at full focal ratio, and deceleration is quick or coasts to a discontinue, this frame-up may offer good performance in certain applications. Ideally though, a break racing circuit with full voltage should baron the brake, fully removing office from the brake during motor uptime, allowing for the best brake operation and service animation .
finally, a word about brake motors. many motor manufacturers offer two types of brake motors. One version has contains a bracken internally connected to motor leads. As such, on can not use distinguish power sources for brakes and motors. only across-the-line or full-voltage centrifugal control should be used with these motors .
The second base version of brake motors offers separate brake wires for connecting the brake coil to a wax voltage source. When using an AC Drive with a bracken motor, select a brake centrifugal with discriminate brake wires. then use a offprint wide electric potential power informant, brake contactor and proper circuit security to control the brake. besides, make sure the brake is powered & released when the AC tug is running including accelerate, at travel rapidly, and decelerating the motive.
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For more information on electrical brakes, please contact your Kaman representative or specialist. He or she can help you select, supply, size and troubleshoot brakes, motors, and AC drives.
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