Basler Electric BE1-50/51B-230 - Manual (Page 74)

A-18 BE1-50/51B-230/-234/-239 Characteristic Curves 9252000894 Rev H
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 for the BE1-50/51B-230 and ±2%, ±5 mA for the BE1-50/51B-234.
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-230 and BE1-50/51B-234 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 A-16.
See Table A-1 and A-2 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
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
Reset characteristic curve equation:
Reset to Time
M
RD
T
R
=
−
=
1 2
Figure A-16. Integrating Reset Characteristic Curve
Reset occurs within 16 ms of when the current decreases to 95% of the pickup level.
Instantaneous Reset