Rockwell Automation 20M LPM15 Liquid-Cooled Adjustable Frequency AC Drive FRN 2.xxx User Manual
Page 66
3-18
Programming and Parameters
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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
3
4
“Coast”
“Coast”
“Decel”
“Continue”
“Coast Input”
“Decel Input”
013
,
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
186
[Power Loss Level]
Sets the level at which the [Power Loss Mode] selection will occur.
Default:
Min/Max:
Units:
Drive Rated Volts
0.0/999.9 VDC
0.1 VDC
Fil
e
Gr
oup
No.
Parameter Name & Description
See
page 3-2
for symbol descriptions
Values
Related
The drive can use the percentages referenced in [Power Loss Mode] or a trigger point can be set for line loss
detection as follows:
V
trigger
= [DC Bus Memory] – [Power Loss Level]
A digital input (programmed to “29, Pwr Loss Lvl”) is used to toggle between fixed percentages and the detection
level.
!
ATTENTION: Drive damage can occur if proper input impedance is not provided as explained below.
If the value for [Power Loss Level] is greater than 18% of [DC Bus Memory], 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.