Basler BE1-50/51B-229, Instruction Manual

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2-2 BE1-50/51B-229 Controls and Indicators 9252000892 Rev A
Table 2-1. Front Panel Control and Indicator Descriptions
Locator Control/Indicator Description
A Target Reset Button The target reset button is pressed to reset the gravity-latched
target indicators.
B Active/Pickup LED The LED turns red when the sensed current exceeds the Time
Pickup setting (H). The LED turns green when the sensed current
decreases below 95% of the Time Pickup setting. A green LED
indicates that the relay is active, but not picked up.
C Time (51) Manual Trip
Test Jacks Short-circuiting the test jacks provides a secure method to
manually trip the controlled circuit breaker. The jacks accept a
standard 0.08 inch diameter banana plug.
WARNING!
Trip circuit voltage is present at the front panel test jacks.
When short-circuiting the test jacks, use insulated jumpers
to avoid contact with this voltage.
D Time Dial Switches Two selector switches, units and tenths, select the desired char-
acteristic curve. A setting of 0.0 gives instantaneous operation
without any intentional delay. A setting of 9.9 corresponds to the
typical time delay provided by an electromechanical relay set at
its maximum time dial setting.
E Curve Switch This switch selects one of nine inverse time functions or one
fixed time function.
F Time (51) Pickup
Switches Two selector switches, units and tenths, set the time overcurrent
pickup level in amperes. Changing the pickup setting while the
relay is in service may cause tripping.
G Targets Gravity-latched target indicators are provided for the time over-
current (51) function and the instantaneous overcurrent (50)
function. Red targets latch when the corresponding overcurrent
element trips. For proper target operation, the trip circuit current
must exceed 200 milliamperes.
H Instantaneous (50)
Pickup Switches
Two selector switches, tens and units, set the instantaneous
overcurrent pickup level in amperes. Changing the pickup setting
while the relay is in service may cause tripping.
I Instantaneous (50)
Manual Trip Test Jacks
Short-circuiting the test jacks provides a secure method to
manually trip the controlled circuit breaker. The jacks accept a
standard 0.08 inch diameter banana plug.
WARNING!
Trip circuit voltage is present at the front panel test jacks.
When short-circuiting the test jacks, use insulated jumpers
to avoid contact with this voltage.
CIRCUIT BOARD
Circuit board controls consist of control switch assembly SW3. The location of SW3 is shown in Figure 2-
2 and SW3 functions are described in Table 2-2.