BE1-50/51M - Human Machine Interface (Controls And Indicators) 2-1
SECTION 2 •
HUMAN MACHINE INTERFACE
(Controls And Indicators)
DESCRIPTION
Table 2-1 lists and briefly describes the operator controls and indicators of the BE1-50/51M Overcurrent Relay.
Reference the call-out letters to Figures 2-1 and 2-2.
Table 2-1. BE1-50/51M Controls and Indicators (Refer to Figures
2-1 and 2-2
)
Locator Control or Indicator Function
A INST MANUAL TRIP
Test Points
When shorted, the test points (jacks) provide a secure means to manually
trip the controlled breaker. Jacks accept a standard 0.080 inch diameter
phone tip plug.
B INST PICKUP
Selectors
Two switches to select pickup current in amperes (UNITS and TENTHS on
five ampere models, COURSE and FINE on one ampere models).
Changing switch selectors while the relay is in service may cause tripping.
C Targets
Black target indicators trip to red and magnetically latch when the trip circuit
current is greater than 0.2 amperes. One target each for TIME and INST.
D TIME PICKUP
Selectors
Two switches to select pickup current in amperes (UNITS and TENTHS on
five ampere models, COURSE and FINE on one ampere models).
Changing switch selectors while the relay is in service may cause tripping.
E CURVE
Selector Ten position selector switch to select one of nine inverse functions or one
fixed time function.
F TIME DIAL
Selectors Two selector switches (UNITS and TENTHS) to select the desired
characteristic curve. A setting of 0.0 results in instantaneous operation
without any intentional delay. A setting of 9.9 corresponds to the typical
time provided by an electromechanical relay at its maximum dial setting.
G TIME MANUAL TRIP
Test Points
When shorted, the test points provide a secure means to manually trip the
controlled breaker. Jacks accept a standard 0.080 inch diameter phone tip
plug.
H ACTIVE/PICKUP
LED Red LED indicates sensed current has exceeded the TIME PICKUP setting.
LED turns from red to green when sensed current falls below 95 % of pickup
setting. When the LED is green, the relay is active but has not picked up.
I Target Reset
Lever Linkage extends through back of front cover to reset both magnetically
latched target indicators.
J SW3 -1
SW3-1 selects the system operating frequency. SW3-1 open (OFF) selects
60 hertz operation. SW3-1 closed (ON) selects 50 hertz operation.
SW3-2
In 100 and 200 series relays
, SW3-2 selects additional delay for the
instantaneous element. Switch SW3-2 closed (ON) provides an additional
instantaneous delay of 0.1 seconds.
SW3-3
In 100 series relays
, switch SW3-3 closed (ON) provides an additional
instantaneous delay of 0.2 seconds. Closing both switches SW3-2 and
SW3-3 provides an additional instantaneous delay of 0.3 seconds.
In 200 series relays
, SW3-3 open (OFF) selects ABB type curves (refer to
Table 1-3. SW3-3 closed (ON) selects GE IAC type curves (refer to Table
1-4).
Courtesy of NationalSwitchgear.com
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