48 M O TO R C O NT R O L A N D P R O T E C T I O N U N I T M1 0 X U SE R G U I D E
Underload protection
M10x protects the motor against underload
conditions. Underload protection function uses
I
Lmax
/In (the ratio of highest measured phase
value ILmax and the rated current of the motor In)
as the criterion. There are other parameters to be
determined, such as alarm level, trip level and trip
delay. The protection characteristic are as
follows:
Function
Setting range 0=Disabled 1=Enabled 3=Alarm only
Default value Disabled
Step value 1
Alarm level
Setting range 20-90%
Default value 30%
Step value 1%
Setting range
Setting range 5-90%
Default value 20%
Step value 1%
Trip delay
Setting range 0-1800sec
Default value 10sec
Step value 1sec
Trip reset mode
Setting range 2=Local 3=Remote 4=Remote and local
Default value 4
Step value 1
—
—
38 Underload protection
The I
Lmax
/In is compared against the underload
alarm level. When I
Lmax
/In decreases below the
alarm level an underload alarm is issued.
The I
Lmax
/In is compared against the underload
trip level. When I
Lmax
/In remains below the trip
level at a time longer than underload trip delay, an
underload trip alarm is issued and the contactor
tripped.
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