ABB MD21 - Noload Protection; Noload Protection Parameters

0 5 . PR OT EC T I O N F U N C T I O N S 49
Function
Setting range 0=Disabled 1=Enabled 3=Alarm only
Default value Disabled
Step value 1
Alarm level
Setting range 5-50%
Default value 20%
Step value 1%
Trip level
Setting range 5-50%
Default value 15%
Step value 1%
Trip delay
Setting range 0-1800sec
Default value 5sec
Step value 1sec
Trip reset mode
Setting range 2=Local 3=Remote 4=Remote and local
Default value 4
Step value 1
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39 Noload protection
Noload protection
M10x protects the motor against no load
conditions. Practically, noload protection is the
same function as underload protection. The
function also uses I
Lmax
/In as the criterion.
The I
Lmax
/In is compared against the no load
alarm level. When I
Lmax
/In decreases below the
alarm level a noload alarm is issued.
The I
Lmax
/In is compared against the noload trip
level. When I
Lmax
/In remains below the trip level at
a time longer than noload trip delay, a noload trip
alarm is issued and the contactor tripped.
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