BE1-51C Installation and Testing
6-5
NOTE
If this is a single-phase relay, this concludes a minimal Timing Test. Other TAP switch
positions may be tried within the limitations of the current source. If this is a three-phase
relay, perform steps 6, 7, 8, and 9 below. If two-phase-with-ground relay, perform steps
6, 7, 10, and 11. If three-phase-with-ground, perform all of the following steps.
Timing Test
The timing characteristics available by programming the relay are illustrated in Figures 1-1 through 1-7.
Output trip should occur at the timing shown on these graphs, for any given TIME DIAL setting, to within 10%
or 20 milliseconds (whichever is greater). Verification of timing accuracy can be limited to low current levels
for convenience.
Verify timing accuracy as follows.
1.
After performing the Preliminary Steps (page 6-3), connect the input current source to terminals
7 and 8 on the relay case (Phase A).
2.
Select the time overcurrent characteristic of choice by entering its identifying code number into
the Phase curve (Pcur) register. (Reference Tables 4-1 and 4-2.) Similarly load the Ground
curve register with the characteristic of choice (if ground current monitoring is a relay option).
3.
Set the PHASE TAP switch to position A. Load 99 into the Time Dial register. (The CALibrate
register is still at the 00 setting given in Preliminary Steps.)
4.
Measure the timing from the application of input current to output contact closure for currents
that are adjusted to the following multiples of TAP:
(a) 2.0 X TAP, and
(b) 5.0 X TAP.
Check the results against the graphed values.
5.
Adjust the TIME DIAL to 20 and repeat step 4.
6.
Disconnect the input current source from terminals 7 and 8 (Phase A) and connect it to
terminals 14 and 15 (Phase B).
7.
Repeat steps 2 through 5 above for phase B.
8.
Disconnect the input current source from terminals 14 and 15 (Phase B) and connect it to
terminals 17 and 18 (Phase C).
9.
Repeat steps 2 through 5 above for phase C.
10. Disconnect the input current source from terminals 17 and 18 (Phase C) and connect it to
terminals 13 and 16 (Ground).
11. Repeat steps 2 through 5 above for ground current.
Summary of Contents for BE1-51C
Page 12: ...BE1 51C General Information 1 6 Figure 1 1 Style Number Identification Chart...
Page 21: ...BE1 51C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 25: ...BE1 51C Functional Description 3 2 Figure 3 1 Functional Block Diagram...
Page 49: ...BE1 51C Operation By Computer 5 14 Figure 5 1 RS 232 Port Connector Wiring...
Page 50: ...BE1 51C Operation By Computer 5 15 Figure 5 2 RS 485 Port Connector Wiring...
Page 58: ...BE1 51C Installation and Testing 6 8 Figure 6 1 Outline Dimensions...
Page 62: ...BE1 51C Installation and Testing 6 12 Figure 6 8 Relay Connections...
