96 Rockwell Automation Publication 750-AT006D-EN-P - January 2022
Chapter 6 Active Front End Tuning
The Power Disturbance Module detected the power loss and disabled the line-side converter. The Motor Side Inverter took control of the DC
bus. It drew energy from the inertia of the load by adjusting the output frequency. The line-side converter resumed control when power was
restored. Then the Motor Side Inverter accelerated the motor back up to speed.
Power Disturbance Module Configuration
Optimal power disturbance module configuration depends on both the application itself and common conditions on the local power grid. Ride
Through can be the best configuration in the following scenarios.
• Load inertia is high and the application does not tolerate stoppage
• The application can tolerate slight disturbances in velocity
In cases where voltage imbalance conditions are common on the grid, consider setting 13:181 [PLL LOS Det Actn] to 0 Ride Thru and
increasing 13:192 [BasicPLL Err Lmt].
In cases where power outages and voltage sags are common on the grid, consider setting 13:181 [PLL LOS Det Actn] to 0 Ride Thru, and both
13:170 [PwrLoss Det Actn] and 13:173 [VltgSag Det Actn] to 2 Ride Thru.
Table 34
summarizes the system configuration under several abnormal line conditions.
Table 34 - Abnormal Line Conditions Parameter Settings
Parameter No. Parameter Name Description
13:170 [PwrLoss Det Actn]
Line Side Cnv Power
Loss Detected Action
Enter a value to select the action taken when a Power Loss condition occurs. Parameter values are as
follows.
• Ignore (0) – No action is taken.
• Type 2 Alarm (1) – A Type 2 Alarm occurs.
– Type 2 Alarms prevent the line-side converter from starting its modulation.
• Ride Thru (2) – The line-side converter pauses modulation for the duration of the Ride Through Timer.
– If the Power Loss condition clears before the timer expires, it resumes operation.
– During the Ride Through attempt, it logs a Type 2 Alarm.
• Major Fault (3) – A Major Fault occurs immediately.
– Major Faults stop the line-side converter from modulating.
13:171 [PwrLossRTExpActn]
LSC Power Loss Ride
Thru Expired Action
Enter a value to select the action taken when the Power Loss condition lasts longer than the Ride Through
Timer. Parameter values are as follows.
• Ignore (0) – No action is taken.
• Type 2 Alarm (1) – A Type 2 Alarm occurs.
– Type 2 Alarms prevent the line-side converter from starting its modulation.
• Major Fault (2) – A Major Fault occurs immediately.
– Major Faults stop the line-side converter from modulating.
13:172 [RideThrough Time] Ride Through Time Enter a value to set the length of the Ride Through Timer.
13:173 [VltgSag Det Actn]
Voltage Sag Detected
Action
Enter a value to select the action taken when a Voltage Sag condition occurs. Parameter values are as
follows.
• Ignore (0) – No action is taken.
• Type 2 Alarm (1) – A Type 2 Alarm occurs.
– Type 2 Alarms prevent the line-side converter from starting its modulation.
• Ride Thru (2) – The line-side converter pauses modulation for the duration of the Ride Through Timer.
– If the Voltage Sag condition clears before the timer expires, it resumes operation.
– During the Ride Through attempt, it logs a Type 2 Alarm.
• Major Fault (3) – A Major Fault occurs immediately.
– Major Faults stop the line-side converter from modulating.
13:174 [VltgSagRTExpActn]
LSC Voltage Sag Ride
Thru Expired Action
Enter a value to select the action taken when the Voltage Sag condition lasts longer than the Ride Through
Timer. Parameter values are as follows.
• Ignore (0) – No action is taken.
• Type 2 Alarm (1) – A Type 2 Alarm occurs.
– Type 2 Alarms prevent the line-side converter from starting its modulation.
• Major Fault (2) – A Major Fault occurs immediately.
– Major Faults stop the line-side converter from modulating.
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