34 Rockwell Automation Publication 20C-PM001F-EN-P - March 2012
Chapter 2 Programming and Parameters
DYNAMIC CONTRO
Power Loss
184 [Power Loss Mode]
Sets the reaction to a loss of input power. Power
loss is recognized when:
• DC bus voltage is ≤73% of [DC Bus Memory]
and [Power Loss Mode] is set to “Coast”.
• DC bus voltage is ≤82% of [DC Bus Memory]
and [Power Loss Mode] is set to “Decel”.
Default:
Options:
0
0
1
2
“Coast”
“Coast”
“Decel”
“Continue”
013
185
185 [Power Loss Time]
Sets the time that the drive will remain in power
loss mode before a fault is issued.
Default:
Min/Max:
Units:
0.5 Secs
0.0/60.0 Secs
0.1 Secs
184
186 [Power Loss Volts]
Sets the level at which the [Power Loss Mode]
selection will occur.
Default:
Min/Max:
Units:
Based on Drive Rated Volts
170.0/780.0 VDC
0.1 VDC
189 [Shear Pin Time]
Sets the time that the drive is at or above current
limit before a fault occurs. Zero disables this
feature.
Note: Added for firmware revision 3.001.
Default:
Min/Max:
Units:
0.0 Secs
0.0/30.0 Secs
0.1 Secs
238
File
Group
No.
Parameter Name & Description Values
Related
The drive can use the percentages referenced in [Power Loss Mode] or a trigger point can be set
at [Power Loss Volts]. A digital input (programmed to “29, Pwr Loss Lvl”) is used to toggle
between fixed percentages and the [Power Loss Volts] level.
ATTENTION: Drive damage can occur if proper input impedance is not
provided as explained below. If the value for [Power Loss Volts] is less than
82% of the nominal DC bus voltage, the user must provide a minimum line
impedance to limit inrush current when the power line recovers. The input
impedance should be equal to or greater than the equivalent of a 5%
transformer with a VA rating 5 times the drives input VA rating.
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