48 S&C Instruction Sheet 695-535
Overcurrent Control Settings
The Vista Overcurrent Control can be programmed to provide a wide variety of
settings combinations. Listed below are the setting ranges that are available to the
overcurrent control.
Table 12. IEC Curves
Time Overcurrent Phase Protection
Inverse Segment Standard Inverse (C1)
Very Inverse (C2)
Extremely Inverse (C3)
Long-Time Inverse
(C4)
Short-Time Inverse
(C5)
Minimum Trip Current, A 14 to 12500 in steps of 0.01
Low-Current Cutoff, A●
14 to 12500 in steps of 0.01
Time Multiplier 0.05 to 1 in steps of 0.01
Time Adder, s 0 to 1000 in steps of 0.01
Definite-Time Phase Protection Element #1
Definite-Time Current, A■
14 to 12500 in steps of 0.01
Definite-Time Time, s 0 – 1000 in steps of 0.001
Definite-Time Phase Protection Element #2
Definite-Time Current, A▲
14 to 12500 in steps of 0.01
Definite-Time Time, s◆
0 – 1000 in steps of 0.001
Reset Time Parameters
Reset Type TIMED
Reset Time, s▼
0 to 1000 in steps of 0.001
● Low-current cutoff must be equal to or greater than the minimum trip current.
■ Definite time current must be greater than or equal to low-current cutoff and/or the minimum trip current.
▲ Definite Time Current 2 should be greater than or equal to Definite Time Current 1.
◆ Time should be less than Definite-Time 1.
▼ Accumulated value will reset to zero after the reset time has elapsed.
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