Parker AC890 Product Manual page 405

POWER LOSS CNTRL
SETUP::MOTOR CONTROL::POWER LOSS CNTRL
Designed for all Motor Control Modes.
This function 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 mains supply loss.
This is achieved by ramping the speed setpoint to zero during the power outage. If during the outage the supply returns, the
speed setpoint is automatically ramped back to the speed setpoint.
When disabled, the drive will trip on UNDERVOLTS if the mains supply is removed.
Parameter Descriptions
ENABLE
When TRUE, the Power Loss Ride-Through functionality is enabled.
TRIP THRESHOLD
Determines the dc link volts at which the Power Loss Ride-Through sequence is triggered.
CONTROL BAND
Sets the dc link voltage above the TRIP THRESHOLD at which the setpoint Ramp to Stop is paused. If the dc link volts remain
above this level for a period greater than 500ms, the setpoint is ramped back to the speed demand.
ACCEL TIME
Determines the time in which the speed setpoint is ramped back to the speed demand. This is expressed as the time to ramp from
zero to MAX SPEED.
D-114
Page
PREF: 112.01
PREF: 112.02
PREF: 112.03
PREF: 112.04
Default: FALSE
Default: 243V
Default: 20 V
Default: 10.00 s
890SD Standalone Drive - Frames G, H & J
Range: FALSE / TRUE
Range: 0 to 1000 V
Range: 0 to 1000 V
Range: 0.01 to 300.00 s