Basler BE1-11m, Instruction Manual

Page: 558 / 610

84-14 9424200996
Settings Calculation Examples BE1-11 m
𝑃𝑃𝑅𝑅𝑠𝑠𝑘𝑘𝐹𝐹𝐴𝐴 = 𝑁𝑁𝑠𝑠𝐴𝐴𝐿𝐿 𝑆𝑆𝑅𝑅𝐿𝐿𝑠𝑠𝐿𝐿𝐿𝐿𝑠𝑠𝐿𝐿 (5%) ∙ 𝐶𝐶𝐿𝐿𝑠𝑠𝐴𝐴𝑠𝑠𝑠𝑠𝑜𝑜𝐿𝐿𝑅𝑅𝑅𝑅𝑜𝑜𝑠𝑠 𝑃𝑃𝑠𝑠𝐿𝐿𝑅𝑅𝑠𝑠𝑠𝑠𝑅𝑅𝑅𝑅𝐿𝐿𝑠𝑠 (4) ∙ 𝐹𝐹𝐿𝐿𝐴𝐴
𝑆𝑆𝑒𝑒𝑆𝑆𝑜𝑜𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆
= 0.05 ∙ 4 ∙ 4.54 = 0.908 𝐴𝐴 𝐴𝐴𝑠𝑠𝑠𝑠𝐿𝐿𝑠𝑠𝐿𝐿𝐿𝐿𝑠𝑠𝑠𝑠
Equation 84-8. 50-3 Pickup
Select I2 mode, set the Pickup setting to 0.908 Secondary A, and set the Time Delay to 10 seconds as
shown in Figure 84-17.
Figure 84-17. Protection, Current, Instantaneous Overcurrent (50-3) Screen
Instantaneous Overcurrent (50-4) - Overload Protection
The 50-4 element is used for overload protection while the motor is running. This protection is configured
according to the service factor of the motor. The pickup setting should be 115 to 125 percent of the
service factor per IEEE C37.96-2000, IEEE Guide for AC Motor Protection . If the service factor is 1.0,
then overload pickup should be 115 percent of FLA. The pickup setting should be 130 percent of FLA for
a service factor of 1.15. If the service factor is unknown, use 1.0. In this example, the service factor is 1.0
and the pickup setting is calculated using Equation 84-9. Secondary full load amps is calculated in
Equation 84-1.
𝑃𝑃𝑅𝑅𝑠𝑠𝑘𝑘𝐹𝐹𝐴𝐴 = 𝐹𝐹𝐿𝐿𝐴𝐴
𝑆𝑆𝑒𝑒𝑆𝑆𝑜𝑜𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆
∙ 1.15 = 4.54 ∙ 1.15 = 5.221 𝐴𝐴 𝐴𝐴𝑠𝑠𝑠𝑠𝐿𝐿𝑠𝑠𝐿𝐿𝐿𝐿𝑠𝑠𝑠𝑠
Equation 84-9. 50-4 Pickup
A delay is used to prevent the BE1-11 m from operating under temporary overloads while the motor is
running. Typically, the delay is set short, but can be set longer if the process is significant or if an operator
is regulating the load. The NEMA MG-1 standard states that “a large induction motor can withstand an
occasional overload of 1.5
•
FLA for 30 seconds.” A conservative time delay (using a factor of 1) is
calculated in Equation 84-10. The hot safe stall time is found in the motor manufacturer data.
𝐶𝐶𝑅𝑅𝐴𝐴𝑠𝑠 𝑅𝑅𝑠𝑠𝐹𝐹𝐿𝐿𝑠𝑠 = 1 ∙ 𝐻𝐻𝐿𝐿𝑅𝑅 𝑆𝑆𝐿𝐿𝑆𝑆𝑠𝑠 𝑆𝑆𝑅𝑅𝐿𝐿𝐹𝐹𝐹𝐹 𝐶𝐶𝑅𝑅𝐴𝐴𝑠𝑠 (9 𝐴𝐴
) = 9
𝐴𝐴𝑠𝑠𝑠𝑠𝐿𝐿𝑠𝑠𝐿𝐿𝐴𝐴
Equation 84-10. 50-4 Time Delay
Select three-phase mode, set the Pickup setting to 5.221 Secondary A, and set the Time Delay to 9
seconds as shown in Figure 84-18.