Parameter Reference D-81
AC30V series Variable Speed Drive
Power Loss Ride Thru
Parameters::Motor Control::Power Loss Ride Thru
The block controls the behaviour of the drive during a power outage.
When enabled, the drive attempts to keep the dc link high by regeneratively recovering the kinetic energy in the motor load in the event of a main
power supply loss.
PNO Parameter Descriptions
1645 Pwrl Enable
Enable the Power Loss Ride Through feature.
1646 Pwrl Trip Threshold
Determines the dc link volts at which the Power Loss Ride Through sequence is triggered.
% of the max dc link voltage ( drive overvoltage level = 100% )
1647 Pwrl Control Band
Determines the band while the speed setpoint is ramped down.
% of the max dc link voltage ( drive overvoltage level = 100% )
Once the dclink falls down below Pwrl TripThreshold, the speed septoint is ramped to zero until the dc link rises above Pwrl trip
Threshold + Pwrl Control Band.
Then the speed septoint is hold, waiting either to continue ramping down if the dc link is still moving down or ramped back to the
speed septoint if the supply returns.
1648 Pwrl Accel Rate
Rate in Hz/s ( electrical frequency/ second) at which the speed septoint is ramped back to the speed demand
1649 Pwrl Decel Rate
Rate in Hz/s ( electrical frequency/ second) at which the speed septoint is ramped to Zero
If this value is set too low, then the deceleration will may be not enough high for having regenerative condition to maintain the dc link.
1650 Pwrl Time Limit
Maximum allowed time in second of the Power Loss Ride Through sequence
If this value is reached, the the drive will trip on POWER LOSS STOP.
1651 Pwrl Active
This diagnostic is TRUE while the Power Loss Ride Through is active
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