BE1-51/27C Tests and Adjustments
5-7
NOTE
For relays having three-phase sensing (sensing input type A or P) only a single input
phase needs to be connected, since this is sufficient for a complete test of the time
delay. For relays that include neutral sensing (sensing input types D, T, and J), this
test includes reconnecting the test output to the neutral sensing terminals for testing
the timed output during neutral sensing.
Step 15. Slowly adjust the front panel
CAL (NEUTRAL)
Control CCW until the front panel
TIMING
indicator
illuminates.
RESULT:
For the neutral minimum overcurrent pickup point of 0.5 A (Step 16a., above) or 1.5 A
(Step 16b., above) the front panel
CAL (NEUTRAL)
control should be near its maximum CCW
limit.
Step 16. Adjust the front panel
CAL (NEUTRAL)
control fully CW to allow measurement of the actual
overcurrent pickup point at the
A
setting of the front panel
TAP (NEUTRAL)
selector. Note that
the front panel
TIMING (NEUTRAL)
indicator will extinguish. Do not disturb this setting.
Step 17. Slowly increase the current toward the value of the front panel
TAP (NEUTRAL)
selector
A
setting
until the front panel
TIMING (NEUTRAL)
indicator illuminates. Do not disturb this setting.
Step 18. Record the current reading and remove input current.
RESULT:
The recorded value should be within ±5% of the front panel
TAP (NEUTRAL)
selector
A
setting for the neutral minimum overcurrent pickup point for the time overcurrent.
Step 19. Set the front panel
TAP (NEUTRAL)
selector to
J
.
Step 20. Slowly adjust the test set, increasing the overcurrent threshold toward the value of the front panel
TAP (NEUTRAL)
selector
J
setting until the front panel
TIMING (NEUTRAL)
indicator just illumi-
nates. Do not disturb this setting.
Step 21. Record the current reading and remove input current.
RESULT:
The recorded value should be within ±5% of the front panel
TAP (NEUTRAL)
selector
J
setting for the neutral maximum overcurrent pickup point for the time overcurrent element.
Timed Output Test
This test checks the accuracy of the time overcurrent characteristic delay.
Step 1. Verify that the preliminary instructions have been performed.
Step 2. (Timing type Z1, Z2, or Z3 only.) Select the desired time current characteristic curve.
Step 3. Set the front panel
TAP
selector to
B
.
Step 4. Adjust the front panel
TIME DIAL
to
20
.
Step 5. Adjust the test set for an overcurrent threshold of precisely 5 times the front panel
TAP
selector
B
setting, as measured on the ammeter.
Step 6. Apply input current to the relay and initiate the test setup timer.
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...