LS ELECTRIC SV-iS7 Series, Руководство пользователя

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Using Protection Features
342
Under Load Trip and Warning Setting Details
Code Description
PRT-27 UL Trip Sel
Sets the inverter operation mode for situations when an under load trip
occurs. If
“1 (Free -Run) “ is set, the output is blocked in an under load fault
tri p situation. If “2 (Dec)” is set, the motor decelerates and stops when an
under load trip occurs.
PRT-25 UL Warn Sel
Select the under load warning options. Set the multi-function output
terminals (at OUT-30
–32) to “6 (Underload).” The warning signals are
output when an under load condition arises.
PRT-29 UL LF Level,
PRT-30 UL BF Level
Sets the range necessary for underload detection based on the
underload type.
Set the underload rate at an operating frequency for the motor-rated slip
speed (2x operation), (BAS-12 Rated Slip) at PRT-29.
At PRT-30, the under load rate is decided based on the base frequency
set at DRV-18 (Base Freq). When variable torque is required (for example,
for fans or pumps), set PRT-
04 (Load Duty) to “0 (Normal Duty).” For loads
operated at constant torques, like elevators and conveyors, set PRT-04 to
“1 (Heavy Duty).”
PRT-26 UL Warn Time,
PRT-28 UL Trip Time
The protection function operates when the under load level condition
explained above is maintained for the set warning time or fault trip time.
This function does not operate if the energy-saving operation is activated
at ADV-50 (E-SaveMode)