BE1-24 General Information
1-9
Table 1-2. Pickup Accuracy and Frequency
Sensed Frequency
Accuracy at 25
((
C
Temperature Stability from a
Ref. Measurement at 25
((
C
40-72 hertz
± 1.0 hertz
± 1.5%
20-40 hertz
± 2.0 hertz
± 3.0%
3-20 hertz
± 8.0 hertz
± 12.0%
Timing Ranges
Inverse Square
(Timed Trip)
Adjustable from 0.1 to 10 in 0.1 increments to select the individual
characteristic curve which best matches the protected equipment's
damage curve. Minimum time delay is 0.25 seconds and maximum
time delay 1000 seconds. A setting of 0.0 is equivalent to a setting
of 10.0. See Figure 1-4 or Figure 1-5 for characteristic curves.
Reset Time
(Available for the Timed Trip function only.) Adjustable in seconds
per percent of full scale trip time from 0.1 to 9.9 in 0.1 second
increments. Note that this means entering a reset rate rather than
a reset time.
A setting of 0.0 enables instantaneous reset time.
Definite Time
Adjustable from 0.1 to 9.9 seconds in 0.1 second increments. A
(Alarm)
setting of 0.0 enables the Alarm output to be instantaneous.
Instantaneous Trip
132 milliseconds at 60 Hz.
(Optional)
Timing Accuracies
Inverse square and definite time accuracies are as follows:
Inverse Square
(Timed Trip)
Follows the curve shown in Figure 1-4 to an accuracy given in the
table below for any combination of TIME DIAL and TIME TRIP
PICKUP settings: repeatable within ±5%.
V/Hz
M
Accuracy
V/Hz > 1.50
M > 1.1
±10%
V/Hz < 1.50
1.1 < M < 1.2
±15%
V/Hz < 1.50
M > 1.2
±10%
Where M = multiples of pickup setting.
Definite Time
Accurate to within ± one-half of the least-significant-digit time plus
(Alarm)
25 milliseconds or 1.0% (whichever is greater).
Targets
Magnetically latching, manually reset target indicators are optionally
available to indicate that a trip output contact has closed. Either
internally operated or current operated targets may be selected.
Current operated targets require a minimum of 0.2 A in the output
trip circuit to actuate, and trip current must not exceed 30 A for 1
second, 7 A for 2 minutes, and 3 A continuous. Current operated
targets only if the relay has normally open (NO) output contacts.
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...
