Basler Electric BE1-11m - Manual (Page 110)

98 9424200996 Rev L
The Voltage Configuration screen is shown in Figure 68.
Figure 68. User Table Curve, Voltage Configuration Screen
Table 37 summarizes the voltage configuration settings.
Table 37. Settings for Voltage Configuration
Setting Range Increment Unit of Measure Default
Curve 1 Voltage 20 to 100 1 percent 100
Curve 2 Voltage & Curve 3 Voltage 0 or 20 to 100 1 percent 0
K Setting
The K setting determines how much the negative-sequence current will bias the equivalent thermal
current calculated by the BE1-11m. The equivalent thermal current is calculated in Equation 7. If the IEC
Curve is being used, then I
eq
is fixed at zero and this equation is not necessary.
I
eq
= I�1 + k �
I
2
I
1
�
2
Equation 7. Equivalent Thermal Current
Where:
I
eq
= equivalent thermal current in pickup (unit of thermal pickup current)
I = maximum phase current in pickup
I
1
= positive-sequence fundamental component of current in pickup
I
2
= negative-sequence fundamental component of current in pickup
k = constant used to determine additional heating from negative-sequence current in pickup
Hot and Cold Safe Stall Time
The Hot and Cold Safe Stall Time settings determine the thermal capacity level that is reached for
currents less than the 49TC pickup. The Running and Stopped Cool Time Constant settings determine
the rate at which the thermal capacity increases or decreases for currents less than the 49TC pickup. The
thermal capacity calculations are shown in Equation 8 and Equation 9. If the IEC Curve is being used,
then I
eq
= 0.
TCU
end
= �
I
eq
S ∙ SF ∙ FLA� ∙ �1 −
hot safe stall time
cold safe stall time�
Equation 8. TCU
end
Thermal Curve (49TC) Protection BE1-11m