BE1-50/51M - Relay Differences 8-3
BE1-50/51M 100 series relays, unit revisions R and S and 200 series relays, unit revisions H and previous
have the following locations for controls and indicators. Table 8-2 lists and briefly describes the operator
controls of these relays. Reference the callout letters to Figure 8-2.
Table 8-2. BE1-50/51M Controls and Indicators for 100 Series Relays Revision R and S
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.
Courtesy of NationalSwitchgear.com
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