Sunday, June 24, 2012

What is regenerative resistor?, How to choose external regenerative resistor? ,How to connect a regenerative resistor?,Delta's ASDA series AC Servo Drives,fault, ALE05,error ciode ALE05,external regenerative resistor,

Delta servo drive Regenerative resistor problem
Regenerative resistor

Q7: What is regenerative resistor? How to connect a regenerative resistor? What kind of situation that needs to use the regenerative resistor?
A7: When the output torque of servo motor in reverse direction of motor rotation speed, it indicates that there is a regenerative power returned from the load to the servo drive. This power will be transmitted into the capacitance of DC Bus and result in rising voltage. When the voltage has risen to some high voltage, the servo system needs to dissipate the extra energy by using a regenerative resistor. ASDA-A series servo drive provides a built-in regenerative resistor and the users also can connect to external regenerative resistor if more regenerative capacity is needed.

When using an external regenerative resistor, connect it to P and C, and make sure the circuit between P and D is open. When using a built-in regenerative resistor, connect it to P and D, and ensure an open circuit between P and C.

When the regenerative power exceeds the processing capacity of the servo drive, the fault, ALE05 may occur. At this time, please install an external regenerative resistor.
Q8: How to choose adequate external regenerative resistor? If there is a simple method for the users to select the regenerative resistor conveniently?
A8: The users can select the adequate regenerative resistors according to the allowable frequency required by actual operation and the allowable frequency when the servo motor runs without load. The allowable frequency when the servo motor run without load is the maximum frequency that can be operated during continuous operation when servo motor accelerate from 0rpm to rated speed and decelerate from rated speed down to 0rpm. The allowable frequencies when the servo motor run without load are summarized in the following table.
Servo Motor Models
Allowable frequency when the servo motor run without load (times/min)
ASMT L Series
ASMT M Series
When the servo motor runs with load, the allowable frequency will change according to the changes of the load inertia and rotation speed. Use the following equation to calculate the allowable frequency.

m = load/motor inertia ratio
The users can select the adequate regenerative resistors according to the allowable frequency by referring to the table below:
Allowable Frequency (times/min)ASMTL SeriesASMTM Series

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