ABB 615 series Technical Manual page 267

1MAC059074-MB A
615 series ANSI
Technical Manual
The voltage slope characteristic is achieved by assigning different values to Voltage high
limit and Voltage low limit. The effective pickup value calculation is based on the
equations.
Voltage level
V < Voltage low limit
Voltage high limit
V ≥
If Voltage low limit ≤ V < Voltage high limit,
A I
 − >

I effective A
( )
> = −
 
C D


GUID-4236A6A6-504B-4A1B-B91D-263066A187B4 V1 EN
Pickup value low
A set
Pickup value
I> set
C set Voltage high limit
Voltage low limit
D set
Here V represents the measured input voltage. The voltage slope characteristic is
graphically represented.
Starting
current
Pickup value
Pickup value low
GUID-E3667B8C-7352-4970-BE53-56EA702DAA47 V1 EN
Figure 129: Effective pickup value or voltage slope characteristic
Effective pickup value (I> effective)
Pickup value low
Pickup value


C V
( )
 ⋅ −

−


Voltage Voltage
low limit high limit
Section 4
Protection functions
(Equation 6)
V
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