Allen-Bradley LSIG - Main Functions; Measurement and Self-Monitoring

(11) DIR 1000587R0002 (Version 02)
2.4.8.3. Trip curves for function G
t =
k
I
2
t = k
2.5. Main functions
2.5.1. Measurement
Type of measurement
Range of values measured by the
trip unit
Standard operation range
Range Tolerance %
Phase and neutral current 0.05 ... 16 In 0.3 ... 6 In ± 1.5
Earth fault current 0.05 ... 4 In 0.3 ... 4 In ± 1.5
2.5.2. Self-monitoring
LSIG provides certain self-testing functions to facilitate failure analysis in the case of faulty operation or incorrect confi guration
of dip-switches and settings. Faults are signalled by a combination of led lights.
The functions are as follows:
 Rating Plug validity.
 Checks to fi nd out whether the current sensors (CS) are connected correctly.
 Watchdog for proper connection of the Trip Coil (TC ).