ABB LT8978bV1 HIEE320639R1 Thermal resistance card

As the motor decelerates, mechanical energy is regenerated back to the drive. Initially this energy goes into the bus capacitors and pumps-up their voltage. With an external regen resistor connected the pump-up of the bus voltage is clamped at about 400VDC. Without a regen resistor, the voltage can continue to rise and at about 425V an over-voltage fault occurs. The need for regen is strong function of maximum motor speed. Below some speed, roughly (1/3 to 1/4) system rated speed, an external regen resistor is unlikely to be needed. For an explanation of why this is so see the section at the end of this appendix, “Regen Need is a Strong Function of Maximum Motor Speed.”

Monitoring Bus Voltage 

There may be a few applications where bus voltage pump up is excessive, but not high enough to trip the hardware over-voltage fault (423V). Bus voltage is considered excessive if it exceeds 390-400 VDC. The built-in oscilloscope can be used to monitor how much the bus voltage (VBus) pumps up at motor deceleration. If the scope shows the bus voltage reaching 390 VDC to 400VDC, then connect an external regen resistor to insure long term reliable operation.

Regen R Characteristics 

Pacific Scientific offers a regen resistor for the PC800 family (Part #PRK-200). The same regen resistor is used for the PC8x4, PC8x3 and PC8x2. It is a 12.5 Ω, 200W, metal clad, panel mount resistor supplied with a short cable for attachment to the drive.The PC800 the regen resistor is mounted external to the drive. The Pacific Scientific supplied PC800 regen resistor comes with a cable long enough so that it can be mounted adjacent to the drive and wired to the drive.

                                                                        

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