9137200997 Rev D BE1-51 Controls and Indicators 2-3
Call-
Out
Control or Indicator Function
P INST 2 Control (Option 1-2
Only)†
A four-turn potentiometer provides adjustment of the front
panel INST 2 trip setting of the range of 1 to 40 times the
selected phase time overcurrent pickup (TAP) value.
Q NEUTRAL DEFEAT LED LED lights when neutral defeat function is enabled.
R NEUTRAL DEFEAT Switch When ON, neutral defeat function is enabled.
S INST 1 NEUTRAL Control
(Options 1-1 and 1-2 Only)†
A four-turn potentiometer provides adjustment of the front
panel INST 1 NEUTRAL trip setting over the range of 1 to 40
times the selected neutral time overcurrent pickup (TAP)
value.
Not
Shown
N/T (Normal/Test) Switch
S1
This switch is mounted internally on the Logic Board. Switch
S1 provides stored built-in-test (BIT) programs to validate the
calibration of the relay.
∗ The number of phases and neutral sensed by the relay is defined by the sensing input type (see the
Style Identification Chart, Figure 1-1).
† This instantaneous overcurrent sensing circuit detects levels that are multiples of the level selected
for the time overcurrent sensing circuit. Any change of the tap selector or calibration (CAL) controls
will cause a directly proportional change of the instantaneous overcurrent levels.
Table 2-2. Sensing Input Ranges
TAP Selector
Current Sensing
Terminals
TAP
Range
Plate or
Pickup
A B C D E F G H I J ØA ØB ØC N
Sensing Input Range 1, Single-Phase ∗
HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 — — —
LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 — — —
Sensing Input Range 1, Three-Phase ∗
HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 14,15 17,18 —
LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 13,15 16,18 —
Sensing Input Range 1, Two-Phase-and-Neutral ∗
HIGH 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,7 — 14,15 17,18
LOW 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 9,7 — 13,15 16,18
Sensing Input Range 2, Three-Phase-and-Neutral
Phase or
Neutral
0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 8,9 13,14 15,16 17,18
Sensing Input Range 3, Three-Phase-and-Neutral
Phase 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 8,9 13,14 15,16 —
Neutral 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 — — — 17,18
Sensing Input Range 4, Three-Phase-and-Neutral
Phase 0.75 1.00 1.50 1.75 2.25 2.50 3.00 3.25 3.75 4.00 8,9 13,14 15,16 —
Neutral 2.25 3.00 4.50 5.25 6.75 7.50 9.00 9.75 11.25 12.00 — — — 17,18
Courtesy of NationalSwitchgear.com
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