Table 2-1. front panel controls and indicators, N table 2-1, Table 2-1 – Basler Electric BE1-50/51B-244 User Manual

Page 20

Advertising
background image

2-2

BE1-50/51B-244 Controls and Indicators

9252000793 Rev C

Table 2-1. Front Panel Controls and Indicators

Locator

Description

A

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.

B

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.

C

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 I).

D

Time Overcurrent Pickup Selector Switches. These two rotary switches select the time

overcurrent pickup current setting in amperes. Adjusting these selector switches while the

relay is in service may cause the relay to trip.

E

Curve Selector Switch. This ten position rotary switch selects one of nine inverse timing

characteristics or one fixed time function. Refer to Appendix A, Characteristic Curves for

details about the timing characteristics of the BE1-50/51B-244.

F

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 E).

When a fixed time characteristic is used (Curve Selector Switch setting of F), the setting of

these switches corresponds to a time delay of 0.0 to 9.9 seconds.

G

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.

H

Active/Pickup Indicator. This bicolor LED indicates the level of current sensed by the relay.

The LED is red when the sensed current exceeds the time overcurrent pickup setting. The

LED color changes from red to green when the sensed current decreases below 95% of the

time overcurrent pickup setting. A green LED indicates that the relay is active but not picked

up.

I

Target Reset Button. This button is pressed to reset the two, gravity-latched target

indicators (locator C).

Advertising