HARDWARE error while using the FFTK Full Function Test Kit S33595
Circuit breaker trips faster than minimum trip band for instantaneous protection when performing automatic
trip curve test on short-time or instantaneous segments of time-current curve and/or HARDWARE
appears in status cell on Automatic Trip Curve Test screen.
FFTK S33595 secondary injection test kit.
Secondary injected fault into trip unit has exceeded one or more of the following circuit breaker protection levels:
• Instantaneous override
• Close and latch
The short answer is: Make sure breaker is closed, turn down the instantaneous and/or short time setting and retest.
The test kit is most likely injecting a current higher than the instantaneous override value, which makes it trip on Inst. override rather than instantaneous.
The long answer is:
Make sure circuit breaker is always in closed position
before beginning secondary injection of each fault. This
will eliminate tripping due to close and latch protection.
Does long-time segment of time-current curve pass
when performing automatic trip curve test?
For communicating Micrologic trip units, if AP trip
indicator LED on trip unit comes on when testing
short-time or instantaneous segments of timecurrent
curve, then circuit breaker has tripped on
instantaneous override, close and latch or
selectivity protection functions.
For non-communicating Micrologic trip units, no
trip indicator LED is available. Check that peak
value for signal being injected does not exceed
instantaneous override or selectivity protection
levels. See published time-current curves.
Contact the customer care center to have the FFTK returned for repair.
For a complete list of error codes please see document 48049-183-06