User Manual Instruction Manual

13-90 GV6000 AC Drive User Manual
The pre-charge relay closes if the bus voltage rises above Vclose
If the bus voltage rises above Vrecover for 20mS, the drive determines the power loss
is over. The power loss alarm is cleared.
If the drive is still in inertia ride through operation, the drive immediately accelerates at
the programmed rate to the set speed. If the drive is coasting and it is in a “run permit”
state, the reconnect algorithm is run to match the speed of the motor. The drive then
accelerates at the programmed rate to the set speed.
480 V example shown. See Table 13-7 for more information.
13.34.6 Half Voltage
This mode provides the maximum power ride through. In a typical application 230VAC
motors are used with a 480VAC drive, the input voltage can then drop to half and the
drive is still able to supply full power to the motor.
The drive determines a power loss has occurred if the bus voltage drops below
Vtrigger.
If the drive is running the inverter output is disabled and the motor coasts.
If the bus voltage drops below Vopen/Vmin (In this mode of operation Vopen and Vmin
are the same value) or if the Enable input is de-energized, the inverter output is
disabled and the motor coasts. If the Not Stop or Run inputs are de-energized, the
drive stops in the programmed manner.
The pre-charge relay opens if the bus voltage drops below Vopen/Vmin and closes if
the bus voltage rises above Vclose.
680V
620V
560V
500V
305V
407V
Bus Voltage
Motor Speed
Output Enable
Power Loss
Pre-Charge
Drive Fault
!
ATTENTION: To guard against drive damage, a minimum line
impedance must be provided to limit inrush current when the
power line recovers. The input impedance should be equal or
greater than the equivalent of a 5% transformer with a VA rating
6 times the drive’s input VA rating.