Uca Sbo Timer - GE C60 Instruction Manual

5.7 INPUTS / OUTPUTS
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PATH: SETTINGS INPUTS/OUTPUTS

# UCA SBO TIMER

#
The Select-Before-Operate timer sets the interval from the receipt of an Operate signal to the automatic de-selection of the
virtual input, so that an input does not remain selected indefinitely (this is used only with the UCA Select-Before-Operate
feature).
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PATH: SETTINGS INPUTS/OUTPUTS
# CONTACT OUTPUT H1
#
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Upon startup of the relay, the main processor will determine from an assessment of the modules installed in the chassis
which contact outputs are available and present the settings for only these outputs.
An ID may be assigned to each contact output. The signal that can OPERATE a contact output may be any FlexLogic™
operand (virtual output, element state, contact input, or virtual input). An additional FlexLogic™ operand may be used to
SEAL-IN the relay. Any change of state of a contact output can be logged as an Event if programmed to do so.
EXAMPLE:
The trip circuit current is monitored by providing a current threshold detector in series with some Form-A contacts (see the
TRIP CIRCUIT EXAMPLE in the DIGITAL ELEMENTS section). The monitor will set a flag (see Technical Specifications for
Form-A). The name of the FlexLogic™ operand set by the monitor, consists of the output relay designation, followed by the
name of the flag; e.g. 'Cont Op 1 IOn' or 'Cont Op 1 IOff'.
In most breaker control circuits, the trip coil is connected in series with a breaker auxiliary contact used to interrupt current
flow after the breaker has tripped, to prevent damage to the less robust initiating contact. This can be done by monitoring
an auxiliary contact on the breaker which opens when the breaker has tripped, but this scheme is subject to incorrect oper-
ation caused by differences in timing between breaker auxiliary contact change-of-state and interruption of current in the
trip circuit. The most dependable protection of the initiating contact is provided by directly measuring current in the tripping
circuit, and using this parameter to control resetting of the initiating relay. This scheme is often called "trip seal-in".
This can be realized in the UR using the 'Cont Op 1 IOn' FlexLogic™ operand to seal-in the Contact Output. For example,
# CONTACT OUTPUT H1
#
5-88
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VIRTUAL INPUTS
UCA SBO TIMEOUT:
30 s
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CONTACT OUTPUTS
CONTACT OUTPUT H1 ID
Cont Op 1
OUTPUT H1 OPERATE:
MESSAGE
Off
OUTPUT H1 SEAL-IN:
MESSAGE
Off
CONTACT OUTPUT H1
MESSAGE
EVENTS: Enabled
CONTACT OUTPUT H1 ID
Cont Op 1
OUTPUT H1 OPERATE:
MESSAGE
Off
OUTPUT H1 SEAL-IN:
MESSAGE
Cont Op 1
CONTACT OUTPUT H1
MESSAGE
EVENTS: Enabled
C60 Breaker Management Relay
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UCA SBO TIMER
Range: 1 to 60 s in steps of 1
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CONTACT OUTPUT H1
Range: Up to 12 alphanumeric characters
Range: Flexlogic™ operand
Range: Flexlogic™ operand
Range: Disabled, Enabled
IOn
5 SETTINGS
5.7.3 UCA SBO TIMER
5.7.4 CONTACT OUTPUTS
GE Multilin