DETAILED OPERATION - Section 4
MTS-3000 OPERATION AND REFERENCE MANUAL 4-3
CU M004 01A
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FIGURE 4.3 FAULT STATE DIAGRAM FOR STATIC MODE
4.3.2 Dynamic Fault Mode
Dynamic Fault Mode refers to the operation mode used to perform operate time tests. Pressing the FAULT
button momentarily initiates dynamic fault mode. In this mode, the timer is started at the moment the AC
outputs change from their prefault values to their fault values. The outputs remain active until the DUT
operates, as detected by an input channel on the DIGITAL I/O module. Detection of the TRIP signal from
the DUT freezes the timer and all AC readings, and forces the system into POSTFAULT. All AC outputs
are set to zero during POSTFAULT. If the DUT fails to trip, pressing RESET will force the MTS out of
fault state.
FIGURE 4.4 FAULT STATE DIAGRAM FOR DYNAMIC MODE
In normal application, the MTS-3000 begins in PREFAULT state. A start trigger action forces a transition
from PREFAULT state to FAULT state. A start trigger action may include momentarily pressing the
FAULT button (<250 msec), or a change-of-state as detected by the DIGITAL I/O modules EXTERNAL
trigger inputs configured for FLT (i.e. Start). While in the FAULT state, all start trigger actions will be
ignored.
Once in FAULT state, a stop trigger action will force a transition from FAULT state to POSTFAULT state.
A stop trigger action can originate from a change-of-state as detected by the DIGITAL I/O modules
EXTERNAL trigger inputs configured for TRIP (i.e. Stop). While in the POSTFAULT state, all further
start and stop trigger actions are ignored unless RECLOSURE has been enabled, which can cause the
MTS-3000 to re-enter the FAULT state.
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