BE1-50/51M - Relay Differences
8-1
SECTION 8 • RELAY DIFFERENCES
GENERAL
This section provides the information necessary to support BE1-50/51M 100 series relays, revision S and
previous. In all unit revisions S and previous SW3 is the same as SW8
DIFFERENCES
BE1-50/51M 100 series relay boards revision Q and previous have the following locations for controls and
indicators. Table 8-1 lists and briefly describes the operator controls of these relays. Reference the callout
letters to Figure 8-1.
Table 8-1. BE1-50/51M Controls and Indicators for 100 Series Relays Revision Q and Previous
Locator
Control or Indicator
Function
J
SW8 -1
SW8-1 selects the system operating frequency. SW8-1 open
(OFF) selects 60 hertz operation. SW8-1 closed (ON) selects 50
hertz operation.
SW8-2
In 100 and 200 series relays, SW8-2 selects additional delay for
the instantaneous element. Switch SW8-2 closed (ON) provides
an additional instantaneous delay of 0.1 seconds.
SW8-3
In 100 series relays, switch SW8-3 closed (ON) provides an
additional instantaneous delay of 0.2 seconds. Closing both
switches SW8-2 and SW8-3 provides an additional instantaneous
delay of 0.3 seconds.
In 200 series relays, SW8-3 open (OFF) selects ABB type curves
(refer to Table 1-3. SW8-3 closed (ON) selects GE IAC type
curves (refer to Table 1-4).
SW8-4
Provides selection of either instantaneous or integrating reset
characteristic. SW8-4 closed (ON) provides integrating reset.
SW8-4 open (OFF) provides instantaneous reset.
K
Auxiliary Output
Jumper Terminations
Configures the auxiliary output contacts to close with either the
instantaneous (50) trip and/or the timed (51) trip.
Jumper E2 to E1A to close the auxiliary contact with the timed
(51) trip. This jumper is yellow and factory installed to close the
auxiliary output contacts with the timed trip.
Jumper E3 to E1B to close the auxiliary contact with the
instantaneous (50) trip. This jumper is blue and factory installed
to close the auxiliary output contacts with the instantaneous trip.