LSIS LSLV-S100 - Page 234

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Learning Protection Features
Under Load Trip and Warning Setting Details
Code
Description
Pr.27 UL Trip Sel
Sets the underload fault trip occurs. If set to 0(None), does not detect the
underload fault trip. If set to 1 (Free-Run), the output is blocked in an
underload fault trip situation. If set to 2 (Dec), the motor decelerates and
stops when an underload trip occurs.
Pr.25 UL Warn Sel
Sets the underload warning options. Set to 1(Yes) and set the multi-function
output terminals (at OU-31 and 33) to 7 (Underload). The warning signals are
output when an underload condition arises.
Pr.26 UL Warn Time,
Pr.28 UL Trip Time
The protection function operates when the underload level condition
explained above is maintained for a set warning time or fault trip time. This
function does not operate if energy-saving operation is activated at Ad-50
(E-Save Mode).
Pr.29 UL LF Level,
Pr.30 UL BF Level
• Setting Heavy Duty
- Do not support Pr.29.
- At Pr.30, the underload level is decided based on the motor’s rated current.
• Setting Normal Duty
- At Pr.29, the under load rate is decided based on twice the operation
frequency of the motor’s rated slip speed (bA.12 Rated Slip).
- At Pr.30, the under load rate is decided based on the base frequency set at
dr.18 (Base Freq).An upper limit and lower limit is based on the inverter’s rated
current.