ABB MD21 - Unbalance Protection; Unbalance Protection Parameters

0 5 . PR OT EC T I O N F U N C T I O N S 47
Function
Setting range 0=Disabled 1=Enabled 3=Alarm only
Default value Disabled
Step value 1
Trip delay
Setting range 0-60sec
Default value 10sec
Step value 1s
Alarm level
Setting range 50-90%
Default value 90%
Step value 1%
Trip level
Setting range 5-90%
Default value 85%
Step value 1%
Trip reset mode
Setting range 2=Local 3=Remote 4=Remote and local
Default value 4
Step value 1
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37 Unbalance protection
Unbalance protection
M10x protects the motor against unbalance
conditions. Unbalance protection function also
uses I
Lmin
/I
Lmax
as the criterion. Function is
suppressed by parameters Motor startup time,
Number of phases and Softstart ramp time.
I
Lmin
/I
Lmax
is compared against the unbalance
alarm level. When I
Lmin
/I
Lmax
decreases below the
alarm level, an unbalance alarm is issued.
I
Lmin
/I
Lmax
is compared against the unbalance trip
level. When I
Lmin
/I
Lmax
remain below the trip level at
a time longer the trip delay, an unbalanced trip
alarm is issued and the contactor tripped.
''