GE VMIVME-5576-000 Channel input card

If all this energy is transferred to a 6800 mf capacitor, initially charged to 70 volts, the voltage on the capacitor after the transfer is equal to 76 volts. Note: This exceeds the volt maximum specification of the 6410 drive. In practice, most or all the kinetic energy is dissipated in the motor windings or in the drive power circuitry so that voltage pump-up is often not a problem. However, in systems running at high speeds and having large load inertia, the voltage might be pumped up significantly and circuitry must be added to insure that the 75 volt limit is never exceeded

To find out if regenerative energy is a problem

run the system while monitoring the supply voltage with a storage oscilloscope. Alternatively, a simple peak detector made form a diode and a capacitor can be attached to the bus and the peak voltage measured using a digital voltmeter. Start the system with slow deceleration rates and monitor the motor power supply to see if the voltage rises during deceleration. Slowly increase the deceleration rate (shorten the deceleration time) while monitoring the voltage. If regeneration causes the supply voltage to exceed 75 Vdc peak, a clamping circuit is required.

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