Advanced motor protection and control - Fuji Electric America
Advanced motor protection and control - Fuji Electric America
Advanced motor protection and control - Fuji Electric America
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Case study 3 : Motor Disconnecting Means<br />
Per NEC 430.102, a disconnecting means must be applied to each <strong>control</strong>ler.<br />
<strong>Fuji</strong> MMS are also cUL listed as "Suitable as Motor disconnect" <strong>and</strong> can be applied as a Motor disconnect.<br />
The advantage of using MMS for disconnect means :<br />
- An extra component will not be needed because the MMS has a dual function, which will lead to smaller space requirement<br />
<strong>and</strong> less components.<br />
7<br />
Traditional<br />
<strong>motor</strong> circuit<br />
MMS application Type E, Type F application<br />
A A A<br />
B<br />
C<br />
D<br />
E<br />
C<br />
A: Motor Feeder shortcircuit<br />
<strong>and</strong> groundfault<br />
<strong>protection</strong><br />
B: Motor disconnecting<br />
means<br />
C: Motor branch-circuit<br />
short-circuit <strong>and</strong><br />
ground-fault<br />
<strong>protection</strong><br />
D: Motor <strong>control</strong>ler<br />
E: Motor overload<br />
<strong>protection</strong>
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