Basler Electric BE1-11m - Manual (Page 572)

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Figure 395. Protection, Voltage, Undervoltage (27P-1) Screen
Undervoltage (27P-2) Starting
The 27P-2 protection element is set to trip when source voltage is too low for a successful start. The
motor manufacturer data indicates that the minimum voltage for a successful start is 85 percent of
nominal. The 27P-2 element is set to prohibit starting when voltage is below 85 percent of nominal. The
pickup setting is calculated in Equation 79.
𝑃𝑖𝑐𝑘𝑢𝑝 = 85% ∙ 𝑁𝑜𝑚𝑖𝑛𝑎𝑙 𝑉𝑜𝑙𝑡𝑎𝑔𝑒 ∙
1
𝑃𝑇𝑅
= 0.85 ∙ 12,000 ∙
1
100
= 102 𝑉 𝑠𝑒𝑐𝑜𝑛𝑑𝑎𝑟𝑦
Equation 79. 27P-2 Pickup
Set a threshold to deactivate the element when there is no motor activity. The inhibit level is calculated in
Equation 80.
𝐼𝑛ℎ𝑖𝑏𝑖𝑡 𝐿𝑒𝑣𝑒𝑙 = 20% ∙ 𝑁𝑜𝑚𝑖𝑛𝑎𝑙 𝑉𝑜𝑙𝑡𝑎𝑔𝑒 ∙
1
𝑃𝑇𝑅
= 0.20 ∙ 12,000 ∙
1
100
= 24 𝑉 𝑠𝑒𝑐𝑜𝑛𝑑𝑎𝑟𝑦
Equation 80. 27P-2 Inhibit Level
Select Three of Three mode, set the Pickup setting to 102 V, set the Inhibit Level to 24 V, and set the
Time Delay to 0 ms as shown in Figure 396.
Settings Calculation Examples BE1-11m