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Limiters DECS-150
The levels have native units of Primary Amps and the rated data associated with them is Machine Rated
Data, Current (on the System Parameters, Rated Data screen).
SCL settings are illustrated in Figure 9-10.
Low Level Limiting
When the stator current exceeds the Low Level setting, the DECS-150 annunciates the elevated level. If
this condition persists for the duration of the High SCL Time setting, the DECS-150 acts to limit the
current to the Low Level SCL setting. When the stator current is below the Low Level setting, no SCL
limiting action is taken by the DECS-150. The High Current Timer counts down either from the high time,
if the High Current Timer has expired, or from the amount of time spent at high level, if the High Current
Timer has not expired. The machine is permitted to operate indefinitely at or below the low-level
threshold.
High Level Limiting
When the stator current exceeds the High Level setting, the DECS-150 acts to limit the current to the
value of the High Level setting and a High Level Timer is initiated. If this level of current persists until this
timer reaches the High Level Time setting, the DECS-150 acts to limit the current to the value of the Low
Level SCL setting.
Initial Delay
In the case of low- or high-level stator current limiting, the limiting function will not respond until an initial
time delay expires.
SCL Shutdown
When this setting is enabled and the SCL limiter is active, the DECS-150 will shut down after the
shutdown delay time expires.
Figure 9-10. SCL Screen
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