Date Code 990215 Factory-Set Logic 1-51
SEL-351P Manual Técnico
HABILITADO operator control to effectively function - so that Relay Word bit PB6 can
propagate on to latch LT5.
Latch LT5 is set up as a flip-flop with one effective logic input:
• Momentarily press the SEF HABILITADO operator control pushbutton and LT5 sets to
logical 1
• Momentarily press the SEF HABILITADO operator control pushbutton again and LT5
resets to logical 0
All latches (LT1 through LT8) are non-volatile (retain their state if the SEL-351P is powered
down and then powered up again). The latch output (Relay Word Bit LT5) propagates to the
following logic:
• Drives the corresponding SEF HABILITADO operator control LED (SEL
OGIC
setting
LED6 = LT5) to indicate that SEF tripping is enabled (LED is illuminated) or disabled
(LED is extinguished).
• Drives the SEF element torque control equation to enable or disable the SEF element.
SEL
OGIC
settings
SET5
(set)
(reset)
Relay
Word
Bits
PB6
Relay
Word
Bit
LT5
RST5
DWG: MP351P031
SEF
HABILITADO
operator
control LED
setting
LED6 = LT5
SEF
HABILITADO
operator control
pushbutton
(pulsed output - see
Figure 1.33)
LT5 is used in the
67N3TC SEL
OGIC
setting to enable/disable
the SEF overcurrent
element
LT4
BLOQUEIO operator
control OFF (see
Figure 1.44)
SEF HABILITADO
operator control ON
(LT5 = logical 1)
Figure SECTION 1: .41: SEF HABILITADO Operator Control LED and Logic
Application
PROTEÇÃO BLOQUEADA Operator Control
As stated in
Figure SECTION 1: .42 (PROTEÇÃO BLOQUEADA), latch LT6 is not used in
any of the factory-set logic. Each press of the PROTEÇÃO BLOQUEADA operator control
pushbutton toggles latch LT6 from LT6 = logical 0 to LT6 = logical 1 and vice versa, but LT6 is
not used in any of the factory-set logic. Thus the PROTEÇÃO BLOQUEADA operator control
is not functional from the factory (corresponding LED is extinguished all the time, too; SEL
OGIC
setting LED7 = 0, see
Figure SECTION 1: .32).
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