ERL 8700/BUS, User Manual

Page: 55 / 166

4 Protection Functions
D01908R02.12 B-PRO User Manual 8700 4-11
Inputs 1 to 6
Protection
50LS Low Set
Two sets of definite time delay overcurrent protection functions on each CT in-
put provide non-directional current detection. The 50LS-1 and 50LS-2 func-
tions are identical in terms of operation. Use the gate switch to select between
an “AND” gate or an “OR” gate. Use an "AND" gate to detect 3-phase over-
current condition; use an "OR" gate to detect any phase overcurrent condition.
The definite time delay can be set to 0.0 for a instantaneous output.
Figure 4.14: 50LS Low Set
50LS Low Set Overcurrent
Gate Switch
AND or OR
Pickup (Amps Sec.)
0.1 to 50.0 (5A)
0.02 to 10.00 (1A)
Pickup Delay (seconds)
0.00 to 99.99
50 Ia
50 Ib
50 Ic
T
O
Gate Switch (Setting)
AND
OR
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