Basler Electric BE1-50/51B-241 - Manual (Page 16)

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Table 2. Front Panel Controls and Indicators
Locator Description
A Time Overcurrent Time Dial Selector Switches. These two rotary switches select the
desired curve of the timing characteristic selected by the Curve Selector Switch (locator B).
When a fixed time characteristic is used (Curve Selector Switch setting of A), the setting of
these switches corresponds to a time delay of 0.0 to 9.9 seconds.
B Curve Selector Switch. This ten position rotary switch selects one of nine inverse timing
characteristics or one fixed time function. Refer to the Characteristic Curves chapter for
details about BE1-50/51B-241timing characteristics.
C Time Overcurrent Pickup Selector Switches. These two rotary switches select the time
overcurrent pickup current setting in amperes (UNITS and TENTHS). Adjusting these
selector switches while the relay is in service may cause the relay to trip.
D Target Indicators. Red target indicators latch when the corresponding set of trip contacts
closes and sufficient trip circuit current is detected. (The level of current that will trip each
target indicator is jumper-selectable. See Circuit Board Controls for more information.) The
Time target indicates the flow of current in the time overcurrent (51) trip circuit. The Inst
target indicates the flow of current in the instantaneous overcurrent A (50-A) trip circuit. No
target is provided for the instantaneous overcurrent B (50-B) trip circuit. Both target
indicators are reset by pressing the target reset button (locator G).
E Instantaneous Overcurrent A Pickup Selector Switches. These two rotary switches select
the instantaneous overcurrent A (50-A) pickup current setting in amperes (UNITS and
TENTHS). Adjusting these selector switches while the relay is in service may cause the
relay to trip.
Note
When testing time overcurrent functions, instantaneous pickup
settings of 00 will affect the calibration of the time functions. Time
pickup settings of 00 also affect instantaneous functions.
F Instantaneous Overcurrent Manual Trip Jacks. These jacks are used to manually trip a
breaker controlled by the 50-A trip output contacts. This is achieved by plugging a jumper
wire, terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.
These jacks do not activate the 50-B trip output contacts.
G Target Reset Button. This button is pressed to reset the two, gravity-latched target
indicators (locator D).
H Active/Pickup Indicator. This bicolor LED indicates the level of current sensed by the relay.
A green LED indicates that the relay is active but not picked up. The LED changes to red
when the sensed current exceeds the time overcurrent pickup setting and back to green
when the sensed current decreases below 95% of the time overcurrent pickup setting.
Note
A minimum of 0.5 A (5A units) or 0.1 A (1A units) is required to light
the LED. The LED may not turn green (active) before turning red
(picked up) at the 0.5 A pickup setting on 5A units or 0.1 A pickup
setting on 1A units.
I Time Overcurrent Manual Trip Jacks. These jacks are used to manually trip a breaker
controlled by the 51 trip output contacts. This is achieved by plugging a jumper wire,
terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.
Controls and Indicators BE1-50/51B-241