RFD-200 S3 USER’S MANUAL
REV 1
15
3.3
Using the RFD-200 S3’s Timer to Test Circuit Breaker Response Time
Use the steps below to use the RFD-200 S3’s timer to measure the opening time of a circuit
breaker. The timer will start when the RFD-200 S3 detects the voltage being applied to the
circuit breaker trip coil. The timer will stop when the RFD-200 S3 detects that the circuit
breaker contact has opened.
a.
Connect the
[TIMER START]
input to the circuit breaker coil terminals as shown in
Figure 3.
b.
Select WET for the
[TIMER START]
input. The timer will start when the trip coil is
energized.
c.
Connect the
[TIMER STOP]
input to the circuit breaker dry contact as shown in Figure
3.
d.
Select DRY for the
[TIMER STOP]
input. The timer will stop when the circuit breaker
contact is opened.
e.
Turn the
[VOLTAGE CONTROL]
knob counter-clockwise to zero (until it can no
longer be turned).
f.
Select START-ON from the control mode area.
g.
Open the circuit breaker. The RFD-200 S3’s timer will start when the circuit breaker coil
voltage is detected, and it will stop when the circuit breaker contact has opened.
h.
The
[TEST COMPLETE]
LED will be illuminated when the test has finished. The time
will be displayed on the LCD screen in milliseconds and cycles.
Summary of Contents for RFD-200 S3
Page 17: ...REV 1 RFD 200 S3 USER S MANUAL 14 Figure 2 Typical Over Current Relay Connection...
Page 19: ...REV 1 RFD 200 S3 USER S MANUAL 16 Figure 3 Typical Circuit Breaker Timing Connection...
Page 23: ...REV 1 RFD 200 S3 USER S MANUAL 20 Figure 4 Typical CT Excitation Test Connection...
Page 25: ...REV 1 RFD 200 S3 USER S MANUAL 22 h Select OFF from the control mode area...
Page 26: ...RFD 200 S3 USER S MANUAL REV 1 23 Figure 5 Typical CT Turns Ratio Test Connection...
