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DETAILED PARAMETER DESCRIPTION
6.3.8 - P14-
Immediate
undercurrent
(%I
N
of the
switch)
It set the minimum undercurrent that the Motor + load
can operate without problems. This protection actuates
when the current of load (Figure 6.4) goes to a value
lower than set in P14; and for a time equal or higher
than preset in P15, indicating error, E05.
NOTE!
This function is activated only at full voltage after the motor
has started.
P14- Calculation
example for
setting of
immediate
undercurrent
(%I
N
of the
switch)
Minimum Current equal to 70% of the I
N
of the motor
1) Standard Connection
I
N
of the switch = 170A
I
N
of the motor = 140A
70% of the 140A= 0.7 x 140A = 98A
0.57 x
I
N
of the switch 170A
=
98A
170A
=
98A
I
N
of the switch
of the switch = 120A
of the motor = 140A
1.4 x 140A = 196A
of the switch within delta
120A x 1.73 = 207.8A
P12 = 94% of
of delta switch = 140% of the motor..
196A
delta switch
0.94 x switch
=
196A
207.8A
=
2) Within the motor delta connection
P14 = 57% of the
I
N
of the switch = 70% of the
I
N
of the motor
Factory
Standard
70
min.
Range
max.
shortest step
20%I
N
1%
190%I
N
P14 -
Immediate undercurrent
