BE1-51/27C Tests and Adjustments
5-12
NOTE
Selection of one of the specific overcurrent pickup points provided by the front panel
TAP
Selector (and with the front panel
TAP CAL
control fully CW) will permit a pickup
point within ±5% of the selector value without having to connect the relay to a test
setup to verify the setting. If present, the front panel
TAP (NEUTRAL)
selector and
the front panel
CAL (NEUTRAL)
control provide this function for the neutral
overcurrent pickup point.
However, if the desired pickup point falls between these front panel
TAP
selector
settings, or if the instantaneous overcurrent option 1-1 or 1-2 is present, the relay
should be connected to a test setup for a precise setting, then the following steps
should be performed.
NOTE
For three-phase relays, ensure that the test signals are connected to both the current
and voltage terminals for the same phase.
TAP and TAP (NEUTRAL) Selector Setting
Step 1. Connect the test setup to the relay according to the sensing input type present in the relay as fol-
lows:
(a) Sensing Input Type L: Refer to Figure 5-1. Because the relay front panel
TIMING
indicator
provides the needed pickup indication, do not connect the test setup to the output
terminals. The current sense terminals for the desired range (HIGH or LOW), however,
should be connected to the relay.
(b) Sensing Input Types J: Refer to Figure 5-6. Because the relay front panel
TIMING
indicator provides the needed pickup indication, do not connect the test setup to the output
terminals. The front panel
TAP
selector is ganged and the adjustment of one input phase
automatically aligns the other, thus, only one set of current sense terminals need be
connected. For adjustment of the front panel
TAP (NEUTRAL)
selector, the relay is re-
connected for neutral sensing by this procedure.
(c) Sensing Input Types A and P: Refer to Figures 5-2 or 5-4. Because the relay front panel
TIMING
indicator provides the needed pickup indication, do not connect the test setup to
the output terminals. The desired range terminals (HIGH or LOW), however, should be
connected to the relay. The front panel
TAP
selector is ganged and the adjustment of one
input phase automatically aligns the others, thus, only one set of current sense terminals
need be connected.
(d) Sensing Input Types D or T: Refer to Figures 5-3 and 5-5. Because the relay front panel
TIMING
indicator provides the needed pickup indication, do not connect the test setup to
the output terminals. The front panel
TAP
selector is ganged and the adjustment of one
input phase automatically aligns the others, thus, only one set of current sense terminals
need be connected. For adjustment of the front panel
TAP (NEUTRAL)
selector, the relay
is re-connected for neutral sensing by this procedure.
Step 2. Remove the relay front cover.
Step 3.
Sensing Input Types L and P. Verify that the front panel
TAP RANGE
plate is installed so the
correct range (HIGH or LOW) is visible.
Summary of Contents for BE-51/27C
Page 1: ...0 1 2 3 4 5 67869 ABC DEF G 6H II GGJ KL M DEF DEK...
Page 16: ...BE1 51 27C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 20: ...BE1 51 27C Controls and Indicators 2 6...
Page 22: ...BE1 51 27C Functional Description 3 2 Figure 3 2 Functional Block Diagram...
Page 32: ...BE1 51 27C Installation 4 7 Figure 4 10 Typical Internal Diagram Sensing Input Type L...