1-48
Factory-Set Logic
Date Code 990215
SEL-351P Manual Técnico
TERRA HABILITADO Operator Control
Figure SECTION 1: .37 describes the logic driven by the TERRA HABILITADO operator
control pushbutton (pulsed output PB1) and operation of the corresponding LED. Note that the
BLOQUEIO operator control logic supervises the TERRA HABILITADO operator control. The
BLOQUEIO operator control has to be OFF (LT4 = logical 1) in order for the TERRA
HABILITADO operator control to effectively function - so that Relay Word bit PB1 can
propagate on to latch LT1.
Latch LT1 is set up as a flip-flop with one effective logic input:
•
Momentarily press the TERRA HABILITADO operator control pushbutton and LT1
sets to logical 1
•
Momentarily press the TERRA HABILITADO operator control pushbutton again and
LT1 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 LT1) propagates to the
following logic:
•
Drives the corresponding TERRA HABILITADO operator control LED (SEL
OGIC
setting LED1 = LT1) to indicate that ground overcurrent tripping is enabled (LED is
illuminated) or disabled (LED is extinguished).
•
Drives the ground overcurrent element torque control equations to enable or disable
ground overcurrent elements
SEL
OGIC
settings
SET1
(set)
(reset)
Relay
Word
Bits
PB1
Relay
Word
Bit
LT1
RST1
DWG: MP351P027
TERRA
HABILITADO
operator
control LED
setting
LED1 = LT1
TERRA
HABILITADO
operator control
pushbutton
(pulsed output - see
Figure 1.33)
LT1 is used in the
following SEL
OGIC
settings to enable/
disable ground
overcurrent elements:
67N1TC
67N2TC
51N1TC
51N2TC
torque control equations
for neutral ground
overcurrent elements
67G1TC
67G2TC
51G1TC
51G2TC
torque control equations
for residual ground
overcurrent elements
LT4
BLOQUEIO operator
control OFF (see
Figure 1.44)
TERRA HABILITADO
operator control ON
(LT1 = logical 1)
Figure SECTION 1: .37:
TERRA HABILITADO Operator Control LED and Logic
Application
Содержание SEL-351P
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