BE1-51/27C Tests and Adjustments
5-6
NOTE
Ensure that the voltage sense terminals and current sense terminals are connected
to the same phase.
Step 6. Slowly increase the current toward the value of the front panel
TAP
selector
A
setting until the front
panel
TIMING
indicator illuminates. Do not disturb this setting.
Step 7. Record the current reading and remove input current.
RESULT:
The recorded value should be within ±5% of the front panel
TAP
selector
A
setting for
the phase minimum overcurrent pickup point for the time overcurrent.
Step 8. Set the front panel
TAP
selector to
J
.
Step 9. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front panel
TAP
selector
J
setting until the front panel
TIMING
indicator just illuminates. Do not disturb this
setting.
Step 10. Record the current reading and remove input current.
RESULT:
The recorded value should be within ±5% of the front panel
TAP
selector
J
setting for
the phase maximum overcurrent pickup point for the time overcurrent element.
Step 11. Perform the following steps as appropriate for the correct sensing input types.
(a) Sensing Input Type L (Single-Phase Sensing). This concludes the time overcurrent test.
Proceed to the timed output test.
(b) Sensing Input Type J (Two-Phase and Neutral Sensing). Remove the power and
reconnect the input sensing to the remaining phases as shown in Figure 5-6, each time
repeating Steps 1 through 10. For neutral testing continue with Step 12.
(c) Sensing Input Type A and P (Three-Phase Sensing). Remove the power and reconnect
the input sensing to each of the remaining phases as shown in Figures 5-4 and 5-6, each
time repeating Steps 1 through 10.
(d) Sensing Input Types D or U (Three-Phase with Neutral Sensing). Remove the power and
reconnect the input sensing each of the remaining phases as shown in Figures 5-3 and 5-5,
each time repeating Steps 1 through 10. For neutral testing continue with Step 12.
Step 12. Perform the preliminary instructions.
For the neutral sensing (Terminals 17 and 18), connect the relay as shown in Figures 5-3 and
5-5, then perform the following steps (Steps 13 through 21).
Step 13. Set the front panel
TAP (NEUTRAL)
selector to
A
.
Step 14. Adjust the test set for an overcurrent threshold having one of the following values:
a) 0.5 A for relays with Sensing Input Range 2 or 3.
b) 1.5 A for relays with Sensing Input Range 4 or 5.
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...
