Basler Electric BE1-50/51B-241 - Manual (Page 48)

40 9252000792 Rev D
Timing Accuracy
Timing accuracy is the sum of
±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap
and is for a given measured multiple of tap. Measurement accuracy of the multiple of tap is the sum of
±2%, ±25 mA.
Fixed Time Characteristic
The fixed time characteristic corresponds to the time dial setting and provides delays of 0.0 to 9.9
seconds. The time setting is constant over a range of pickup multiples from 1.0 to 40. Accuracy is
±1
cycle,
±2% of the time to trip for time dial settings of 0.1 and greater.
Integrating Time Reset Characteristic
The relay can be user-configured for integrating or instantaneous type reset.
Integrating reset simulates the disk reset of electromechanical relays and begins when the current
decreases below 95% of pickup. BE1-50/51B-241 relays provide the integrating reset function even when
input current decreases to zero.
Integrating reset characteristics are defined by the following equation and are illustrated in Figure 28. See
Table 4 and Table 5 for the equation constants.
1
2 −
=
M
RD
T
R
Where: T
R
= time to reset in seconds
R = constant for the particular curve
D = time dial setting
M = current in multiples of pickup setting during reset
Figure 28. Integrating Reset Characteristic Curve
Time characteristic curve equation:
Trip to Time
= + +
−
=
K BD
C M
AD
T
N T
Where: D = time dial setting
M = multiple of pickup setting
Characteristic Curves BE1-50/51B-241