3-2 BE1-50/51B
Functional
Description 9252000991
Rev
N
Outputs
Instantaneous and Timed
System circuit breakers controlled by the output contacts can be manually tripped by applying a short
across the TIME or INST MANUAL TRIP front panel test points. Current flow in the trip circuit is indicated
by the operation of the target. The targets will not operate without adequate operating power for the relay.
Auxiliary
The auxiliary output contacts can be configured by the user to close when the timed and/or instantaneous
trip occurs. With both jumpers installed (this is the factory setting) either the timed or instantaneous trip
closes the auxiliary contacts. Effective with unit revision S, in units 9252000100 through 9252000109, the
printed circuit board was changed. Now, the PCB for 100 and 200 series relays are similar. User’s with
units previous to revision R may see Section 6, Relay Differences, for installing auxiliary output contact
jumpers.
POWER
CT
SUPPLY
POWER
BRIDGE
CT
SIGNAL
TIME
SCALE
INST
SCALE
MUX
SW
SW
SW
SW
TIME
PICKUP
INST
PICKUP
SW
SW
SW
DOG
WATCH
SUPERVISOR
MICRO
51
50
TIME
DIAL
TIME
CURVE
50/60 Hz
INST DELAY
TP
TP
AUX
ISOLATION
TARGETS
MAGNETIC
ACTIVE/PICKUP
51
50
INPUT
GND
D1181-09
2
3
6
5
4
7
8
9
AND
A/D
CONVERTER
POWER-OFF
SENSING
SERIES 200 RELAYS ONLY
SW
RESET CHAR.
51
50
Figure 3-1. Functional Block Diagram
CAUTION
Trip circuit voltage is present at the front panel test points. When shorting the test
points, use insulated jumpers to avoid contact with these voltages.
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