Instruction Manual

7–22 Programming
Feature Select
[FStart Forward]
This value setsthe frequencyat which theforwardspeed
search begins. If this value exceeds [Maximum Freq],
speed search will begin at [Maximum Freq]. Forward
search ends at zero Hertz or when motor speed is found.
Parameter Number 156
Parameter Type Read and Write
Display Units / Drive Units 1 Hertz / Hertz
Factory Default 60 Hz
Minimum Value 0 Hz
Maximum Value 400 Hz
[FStart Reverse]
This value setsthe frequencyat which thereversespeed
search begins. If this value exceeds [Maximum Freq],
speed search will begin at [Maximum Freq]. Reverse
search ends at zero Hertz or when motor speed is found.
Parameter Number 157
Parameter Type Read and Write
Display Units / Drive Units 1 Hertz / Hertz
Factory Default 0 Hz
Minimum Value 0 Hz
Maximum Value 400 Hz
[LLoss Restart]
Thisparameterselectsthereconnectmodeafterrecovery
from a line loss condition.
Parameter Number 228
Parameter Type Read and Write
Factory Default “Track Volts”
Units Display Drive
“Speed Search” 1 Frequency sweep
“Use Encoder” 2 Read feedback
“Track Volts” 3 Read motor volts
Firmware 5.001 & later “Speed Srch 10s” 4 Frequency sweep takes 10 seconds
Firmware 5.001 & later “Speed Srch 20s” 5 Frequency sweep takes 20 seconds
Firmware 5.001 & later “Speed Srch 40s” 6 Frequency sweep takes 40 second
Drive Units=“4” Firmware 4.001 & before “Last Speed” 7 Start at last output
[Line Loss Mode]
Selectsthe methodof detectinga powerline lossand the
responsetoa lineloss.Regardless ofselection, ifthe bus
voltagedropsbelow[MinimumBus],theoutputtransistors
are disabled. If the line is restored, the method of
recovering is set by [LLoss Restart].
“LoBus” selections (0 or 2)– drivedetermines a line loss
hasoccurredifthebusvoltagedropstolessthan[DCBus
Memory] – [Line Loss Drop] volts. The drive determines
the line has been restored if the bus voltage rises above
[DC Bus Memory] – [Loss Recover] volts.
“Input” selections (1 or 3) – drive determines a line loss
has occurred if the“pulse input” is de-energizedand that
thelinehasbeenrestoredifthe“pulseinput”isenergized.
Typically this method is used with drives in a multi-drive
common bus system with a bus supply unit that directly
monitors the power line and provides a line loss signal.
“Off” selections(0or 1)– thedriverespondsto aline loss
by turning off the output transistors. The method of
recovering from a line loss is set by [LLoss Restart].
“Decel” selections (2 or 3) – the drive responds to a line
lossbyactivatingtheinertiaridethru function.The loadis
decelerated at just the correct rate so that the energy
absorbed from the mechanical load balances the losses
and bus voltage is maintained at the value set by [Ride
Thru Volts]. Ifthe line isrestored, thedrive acceleratesat
the programmed rate to the commanded frequency.
Parameter Number 256
Parameter Type Read/Write
Factory Default “LoBus>Off”
Units Display Drive
“LoBus>Off” 0 Bus voltage drop disables firing.
“Input>Off” 1 Input through pulse input disables
firing.
“LoBus>Decel” 2 Bus voltage drop initiates ride
through.
“Input>Decel” 3 Input through pulse input initiates
inertia ride through.