Instruction Manual

7–24 Programming
Feature Select
[Line Loss Volts]
Sets the bus voltage below which the drive recognizes a
lineloss.Specifically:If[DCBusVoltage]dropsbelow[DC
Bus Memory] – [Line Loss Volts] and if [Line Loss Mode]
is set to 0 or 2, the [Drive Alarm 1]. Line Loss bit will be
set and the drive will take the selected line loss action.
Parameter Number 320
Parameter Type Read and Write
Display Units / Drive Units 1 Volt / 4096 = Drive Rtd Volts
Factory Default 59/117/146 Volts
Minimum Value 40/80/100 Volts
Maximum Value 200/400/500 Volts
[Loss Recover]
Sets the bus voltage above which the drive recognizes a
line loss recovery. Specifically: If [DC Bus Voltage] rises
above[DCBusMemory]–[LossRecover]andif[LineLoss
Mode] is set to 0 or 2, the “Line Loss” bit of [Drive Alarm
1] is cleared and the drive recovers from line loss. This
parameter shouldbe set lower than[Line Loss Volts] (i.e.
for ahigher bus voltage), otherwise the drive will cycle in
and out of line loss.
Parameter Number 321
Parameter Type Read and Write
Display Units / Drive Units 1 Volt / 4096 = Drive Rtd Volts
Factory Default 29/59/73 Volts
Minimum Value 20/40/50 Volts
Maximum Value 200/400/500 Volts
[Ride Thru Volts]
Sets thebus voltagethat the inertia ride thru function will
attemptto regulate.If [LineLoss Mode]= “LoBus>Decel,”
alinelossconditionactivatestheinertiaridethrufunction.
The load is decelerated such that the energy absorbed
from the mechanical load balances the losses – bus
voltage is maintained.
Thisparametershouldbesetgreaterthan[LossRecover]
(i.e.foralowerbusvoltage).Otherwise thedrivewillcycle
in and out of line loss.
NOTE: If [Line Loss Mode] = “Input>Decel,” line loss
operation is similar but the inertia ride thru function
regulates the bus to the value in [DC Bus Memory].
Parameter Number 322
Parameter Type Read and Write
Display Units / Drive Units 1 Volt / 4096 = Drive Rtd Volts
Factory Default 29/59/73 Volts
Minimum Value 40/80/100 Volts
Maximum Value 200/400/500 Volts
[Min Bus Volts]
Sets the bus voltage below which the drive will disable
firing.The“LineLoss”flagin[DriveAlarm1]isalwaysset.
If [Low BusFault] =“Enabled”the drivefaultswith anF04
“UndervoltFault.”Thismeansthatevenif[LineLossMode]
= “Input>Decel” dropping below minimum bus disables
firing and signals a line loss.:
To check the minimum safe value for [Minimum Bus]:
- Set [Low Bus Fault] = “Disabled”.
- Set [Line Loss Fault] = “Disabled”.
- Select [DC Bus Voltage] on the HIM.
- Withthedrivestopped,disconnectpowerfromthedrive.
- Watch the HIM display for the lowest voltage reading
before the HIM loses power.
Parameter Number 323
Parameter Type Read and Write
Display Units / Drive Units 1 Volt / 4096 = Drive Rtd Volts
Factory Default 194/388/485 Volts
Minimum Value 100/200/250 Volts
Maximum Value 200/400/500 Volts
[Traverse Inc]
Sets the time period of increasing frequency. Setting this
parameter to zero disables the P Jump function.
Parameter Number 78
Parameter Type Read and Write
Display Units / Drive Units 0.01 Second / Seconds x 100
Factory Default 0.00 Sec
Minimum Value 0.00 Sec
Maximum Value 30.00 Sec
ATTENTION: To guard against possible drive damage, this parameter MUST
be set such that firing is disabled by the drive at a bus voltage higher than the
busvoltageatwhich thepowersupplyforthegate drivecircuits islost. Seethe
procedure at left to check the minimum value for this parameter.
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