3-4
BE1-24 Functional Description
Figure 3-3. Inverse Time Delay and Reset Time
After tripping occurs, the relay resets at the defined linear rate only after the overexcitation condition has
been corrected (when voltage falls below the volts per hertz pickup point). This is provided that the tripping
action does not remove the sensing potential totally. If the sensing potential is removed, the timing function
is reset.
Definite Time Alarm
Definite time delay for the alarm function is adjustable, using a front panel thumbwheel with settings from 0.1
to 9.9 seconds in 0.1 second increments. A setting of 0.0 enables the alarm output to be instantaneous. The
alarm time delay is performed by the microprocessor. When the pre-selected alarm pickup level has been
exceeded, timing is initiated. As long as volts per hertz remains above pickup, timing will continue for the
selected duration. At that time, the alarm output relay energizes.
Instantaneous Trip Output
Instantaneous trip output is optional. When this option has been selected, the relay will respond in less than
eight cycles for a volts per hertz magnitude that is 1.5 times or greater than the pre-selected pickup setting.
OUTPUTS
Output relays are provided for the alarm and timed trip functions. Contact configuration is either normally
open (NO) or NC as determined by the style chart. If the instantaneous trip function has been selected, the
output relay contact configuration will be the same as the selected contact configuration for timed trip. The
relay fail output contact is NC for all relay styles. Auxiliary output relays are optionally available for the timed
trip and instantaneous trip functions only and may have either NO or NC contacts.
TIMING STATUS DISPLAY (TSD)
Associated with the trip integrating timer is a timing status display consisting of a series of 10 LEDs (Figure
3-4).
Figure 3-4. Time Progression Display
This display indicates the status of the integrating timer. As time accumulates toward trip, these LEDs are
illuminated. Each LED represents 10 percent of the total required for tripping.
Summary of Contents for BE1-24
Page 9: ...1 4 BE1 24 General Information Figure 1 1 Inverse Square vs Two Step...
Page 10: ...BE1 24 General Information 1 5 Figure 1 2 Protection Characteristics of the BE1 24...
Page 12: ...BE1 24 General Information 1 7 Figure 1 3 Style Number Identification Chart...
Page 16: ...BE1 24 General Information 1 11 Figure 1 4 Inverse Square Characteristic Curves...
Page 19: ...2 2 BE1 24 Human Machine Interface Figure 2 1 Location of Controls and Indicators...
Page 27: ...4 2 BE1 24 Installation Figure 4 1 M1 Case Outline Dimensions Front View...
Page 30: ...BE1 24 Installation 4 5 Figure 4 4 M1 Case Double Ended Panel Drilling Diagram Rear View...
Page 31: ...4 6 BE1 24 Installation Figure 4 5 M1 Case Panel Drilling Diagram...
Page 32: ...BE1 24 Installation 4 7 Figure 4 6 M1 Case Projection Mounting Outline Dimensions Rear View...
Page 34: ...BE1 24 Installation 4 9 Figure 4 7 Typical Internal Connections...
