Low Dc Bus Fault Avoidance Enable; High Dc Bus Fault Avoidance Enable - Reliance electric GV3000/SE Instruction Manual

U.023

Low DC Bus Fault Avoidance Enable

Parameter Range: OFF = Drive will not regulate the DC bus on a line dip condition
ON = Drive will decelerate the motor to attempt to hold up the DC bus on a line dip
Default Setting: OFF
Parameter Type: Tunable (at rest or during operation)
Description: This parameter. selects how the drive responds to power loss (line dip condition).
This feature applies to SVC applications only and is not available if the drive is
configured as a torque regulator
If this feature is enabled and DC bus voltage drops below 80% of nominal, the drive
decelerates the motor enough to maintain bus voltage. Alarm code LIL appears on
the display while the drive is regulating the DC bus. Note that the lighter the load,
the longer the power dip ride-through time can be. When input power is restored,
the drive ramps to the reference speed.
If this feature is enabled, and the DC bus voltage drops while the drive is stopped, LIL will be
displayed.
This parameter is not related to P.042 (Line Dip Ride-Through Time).
U.024

High DC Bus Fault Avoidance Enable

Parameter Range: OFF = Drive will not attempt to regulate the DC bus on a high bus condition
ON = Drive will attempt to regulate the DC bus on a high bus condition
Default Setting: OFF
Parameter Type: Tunable (at rest or during operation)
Description: This parameter. selects how the drive responds to high bus voltage.
This feature is not available if the drive is configured as a torque regulator.
If DC bus voltage exceeds a predetermined threshold, the drive generates a high
bus alarm (HIdc). If U.024 = ON, the drive attempts to regulate the bus to avoid a
high bus fault (HU). Note that this may extend the programmed deceleration time
(P.002, P.018). See table 7-1 in chapter 7 for the alarm thresholds.
Set this parameter to OFF if a dynamic braking unit is connected to the drive.
For SVC operation, drive speed may increase as much as 5% above the speed
reference in an attempt to decrease the DC bus voltage level.
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6 - VECTOR REGULATION MODE
condition
GV3000/SE 49'1329 e