BE1-51/27C Tests and Adjustments
5-10
NOTE
For relays having neutral sensing (sensing input types D, T, and J) perform Step 12.
Otherwise, proceed to Step 13.
NOTE
For relays with option 1-2 (inst 2 elements), perform Step 13. Otherwise, the test ends
here.
NOTE
This concludes the instantaneous overcurrent sensing and output test.
Step 6. Remove input current. Record the test set current setting.
RESULT:
The recorded value should be equal to or less than the front panel
TAP
selector
A
setting for the minimum overcurrent pickup point for the instantaneous 1
overcurrent element.
Step 7. Reset the relay front panel targets (if present).
Step 8. Turn the front panel
INST 1
control fully CW to establish a pickup point of 40 times the front panel
TAP
selector
A
setting.
Step 9. Adjust the test set to approximately 35 times the front panel
TAP
selector
A
setting.
Step 10. Slowly adjust the test set further toward an overcurrent threshold of 40 times the front panel
TAP
selector
A
setting until the instantaneous 1 output relay energizes. Do not disturb this setting.
RESULT:
If target Type A or B is present:
(a)
The front panel
FUNCTION - INST 1
target (if present) will trip.
(b)
The appropriate front panel
ELEMENT
target
A
,
B
, or
C
(if present) will trip.
Step 11. Record the current reading. Remove input current (the front panel
TIMING
indicator should
extinguish).
RESULT:
The recorded value should be greater than 40 times the front panel
TAP
selector
A
setting for the maximum overcurrent pickup point for the instantaneous 1
overcurrent element.
Step 12. For the neutral sensing, connect the relay as shown in Figures 5-3 and 5-5, then repeat Steps 2
through 11, substituting the following:
(a) The front panel
TAP (NEUTRAL)
selector instead of the front panel
TAP
selector (Step 3).
(b) The front panel
INST 1 (NEUTRAL)
control instead of the front panel
INST 1
control (Step 4).
Step 13. Reconnect the test setup to the inst 2 output terminals (11 and 12) as shown in Figure 5-1, then
repeat Steps 4 through 11, substituting the following:
(a) Front panel
INST 2
Control instead of the front panel
INST 1
Control (Step 3).
(b) Front panel
FUNCTION - INST 2
target instead of the front panel
INST 1
target (Step 4).
(c) Instantaneous 2 output relay instead of the instantaneous 1 output relay (Step 2).
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...