AverageCurrentThreshold Parameter
Default Value: 2.6
Minimum Value: 0.001
Maximum Value: 150.0
Units: amperes
Type: float
WARNING: If you set this parameter to an incorrect value, failure and damage to the motor can occur.
IMPORTANT: If you want the controller to generate an axis fault, you must set the corresponding bit in the FaultMask Parameter. When an axis fault is generated, you can configure what the axis does by changing the state of the corresponding bit in the FaultMaskDecel Parameter and FaultMaskDisable Parameter.
The AverageCurrentThreshold parameter specifies the maximum permitted average (RMS) current before the controller generates an over current fault. An over-current fault is generated when the average current of the axis over an interval specified by the AverageCurrentTime parameter is more than the value specified in the AverageCurrentThreshold parameter.
To set this parameter with an Aerotech motor
Each Aerotech motor has a continuous current rating that is specified in both Apk and Arms. Set this parameter to the Apk rating.
To set this parameter with a motor that is not from Aerotech
- If the motor has a continuous rating that is specified in Apk, set this parameter to the Apk rating.
- If the motor has a continuous rating that is specified in Arms, set this parameter to the formula that follows.
To limit the maximum current of an axis without generating a fault, use the MaxCurrentClamp Parameter.
Because this parameter is intended to protect the motor and the amplifier from potential damage, set its value to whichever is lower, the continuous current rating of the amplifier or the continuous current rating of the motor. You can get this information from the data sheets for the devices.
The quantity of time that the axis can maintain a given level of current without exceeding this threshold decreases as the quantity of current that is commanded increases. Due to how the RMS current is calculated, this means that the fault occurs in one quarter of the time if twice the quantity of current is commanded. If the current consistently stays below the threshold, the fault never occurs.
An internal safety feature prevents an axis from commanding the amplifier's peak current rating for more than one second, regardless of the value of this parameter. If this condition occurs, an amplifier fault is generated.
