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Table 4-1.—Three Phase Motor Controller Circuit—Continued
MANUAL
CONDITION
ACTION
Start button is
Current flows through
pushed
the path from L1
through the control
circuit fuse, the stop
button, the start
button, OL1, OL2,
OL3, and to the
bottom of the M coil.
L3 is providing
voltage to the top
side of the M coil.
The M coil is
energized.
None
When current
energizes the M coil,
contacts M1 through
M4 close, providing
current to the three-
phase motor. (Notice
that the start button
no longer provides a
path for current to
flow.) The path
through M4 is
keeping the M coil
energized.
Stop button is
Momentarily, the path
pushed
leading to the M coil
is open. This de-
energizes the M coil,
and opens contacts
M1 through M4.
ILLUSTRATION
4 - 10
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