Instruction Manual

Programming 7–23
Feature Select
T1 T2 T3
T1 = Loss of Power
T2 = Line Loss Recognized by Drive
T3 = Power Returned
T4 = Recovery from Line Loss Initiated by Drive
T5 = Minimum Bus Voltage Level, Undervoltage Fault Point
T6 = 500
ms Time Out, Line Loss Fault
T4
T5
T6
[DC Bus Memory]
[Ride Thru Volts]
[Min Bus Volts]
[DC Bus Memory] – [Loss Recover]
[DC Bus Memory] – [Line Loss Volts]
Undervoltage Fault
Line Loss Fault
Power Loss Ride-Thru
Important: The 1336 SPIDER has the ability to ride through
short power interruptions. However, power loss ride-thru
requires careful system design to guard against problems
associated withrapid returnof the ACline voltageafter aline
voltage dip. Consult the factory with your application details
beforeattemptingtoprogramyourdrivetoridethroughanAC
line voltagedip of more than 15% below the nominalvoltage.
6 parameters are associated with the line loss functionality.
[Line Loss Mode] selects the method of detecting a power
line loss and the response to a line loss.
[Line Loss Volts] adjusts the level at which a line loss is
recognized when [Line Loss Mode] is set to “LoBus>Off” or
“LoBus>Decel.”
[LossRecover]adjuststhelevelatwhichthedriverecognizes
theinput powerhasreturned when[LineLoss Mode]is setto
“LoBus>Off’ or “LoBus>Decel.”
[RideThruVolts]setsthebusvoltagethattheinertiaridethru
function will attempt to regulate. If [Line Loss Mode] is set to
“LoBus>Decel,” a line loss condition activates the inertia ride thru function. The load is then decelerated such that the energy absorbed from the mechanical
load balances the losses, and bus voltage is maintained.
[Min Bus Volts] sets the bus voltage below which the drive will disable firing of the output devices.
[Line Loss Restart] selects the timing and method of reconnecting the motor after power returns.
Operation when [Line Loss Mode] is set to “LoBus>Off.”
If a power interruption occurs (T1) the drive will continue to operate from stored DC bus energy until the bus voltage drops to the level set by
[DCBusMemory]–[LineLossVolts](T2).Atthispoint,thedriveoutputisturnedoffanda500mstimerisstarted.Oneofthefollowingconditionswillthenoccur:
1. The bus voltage willfallbelow thelevelset by[Min Bus Volts] (T5) before thetimer expires. Thiswill generate abus UndervoltageFaultif [LowBus Fault]is
set to ”enabled.”
2. The bus voltagewill remain below [DCBus Memory] – [LossRecover], but above [Min Bus Voltage] and thetimer expires (T6).If [Line Loss Fault] is setto
“enabled,” a Line Loss Fault will be issued.
3. The input poweris restored (T3) and thebus voltage rises above [DC BusMemory] – [LossRecover] (T4)before the timerexpires.This allows the drive to
turn its output on and resume running according to the selection programmed in [Line Loss Restart].
Operation when [Line Loss Mode] is set to “LoBus>Decel.”
Operation in this mode is similar to above, except that the drive will attempt to maintain the bus voltage at the level programmed in [Ride Thru Volts].
If a power interruption occurs (T1) the drive will continue to operate from stored DC bus energy until the bus voltage drops to the level set by
[DCBus Memory] –[Line LossVolts](T2). Atthis point,the drive willstart a500ms timerand attemptto regulatethe bus voltage atthelevelset by [RideThru
Volts]. One of the following conditions will then occur:
1. The drive is unable to extract enough energy from the mechanical load, and the bus voltage will fall below the level set by [Min Bus Volts] (T5) before the
timer expires. This will generate a bus Undervoltage Fault if [Low Bus Fault] is set to ”enabled.”
2. The bus voltage will be maintained at the level programmed in [Ride Thru Volts] and the timer expires. If [Line Loss Fault] is set to “enabled,” a Line Loss
Fault will be issued.
Important: [RideThru Volts] shouldbe setbelow thelevel setby[DC Bus Memory] –[Loss Recover],below thelevelset by [DCBus Memory] –[Line Loss
Volts], and above thelevel set by [MinBus Voltage]. If [RideThru Volts]is set above therecovery level,the drivewill oscillate inand out ofline loss.If [Ride
Thru Volts]is setabovetheline losslevel, assoonas aline lossis detected,the drivewill immediatelydecelerate asquickly asthedecel settingallowsuntil
thebusvoltageincreasesto theride-thru level.If [RideThruVolts]is setbelow[Min BusVoltage],the busvoltagewill beallowedto dropbelow theminimum
required and the drive output will be turned off.
3. The input power is restored (T3) and the bus voltage rises above [DC Bus Memory] – [Loss Recover] (T4) before the timer expires. The drive will then
accelerate back to the commanded speed using the programmed acceleration rate.
Operation when [Line Loss Mode] is set to “Input>Off” or “Input>Decel.”
When operating in either of these modes, the line loss condition is detected by an external source. The drive is then signaled through the Pulse input that a
lossofpowerhas occurred.Driveoperationis thesame aswhen [LineLoss Mode]is setto “LoBus>Off” or“LoBus>Decel,”exceptforthefollowing:If aninertia
ride-thru is initiated, the drive attempts to regulate the bus at the value in [DC Bus Memory] rather than the value in [Ride Thru Volts].