Clear Relay Records - GE C30 Instruction Manual

5 SETTINGS
• DEFAULT MESSAGE INTENSITY: To extend phosphor life in the vacuum fluorescent display, the brightness can be
attenuated during default message display. During keypad interrogation, the display always operates at full brightness.
• SCREEN SAVER FEATURE and SCREEN SAVER WAIT TIME: These settings are only visible if the C30 has a liquid
crystal display (LCD) and control its backlighting. When the
is turned off after the
DEFAULT MESSAGE TIMEOUT
have been pressed and no target messages are active. When a keypress occurs or a target becomes active, the LCD
backlighting is turned on.
• CURRENT CUT-OFF LEVEL: This setting modifies the current cut-off threshold. Very low currents (1 to 2% of the
rated value) are very susceptible to noise. Some customers prefer very low currents to display as zero, while others
prefer the current be displayed even when the value reflects noise rather than the actual signal. The C30 applies a cut-
off value to the magnitudes and angles of the measured currents. If the magnitude is below the cut-off level, it is substi-
tuted with zero. This applies to phase and ground current phasors as well as true RMS values and symmetrical compo-
nents. The cut-off operation applies to quantities used for metering, protection, and control, as well as those used by
communications protocols. Note that the cut-off level for the sensitive ground input is 10 times lower that the
setting value. Raw current samples available via oscillography are not subject to cut-off.
CUT-OFF LEVEL
• VOLTAGE CUT-OFF LEVEL: This setting modifies the voltage cut-off threshold. Very low secondary voltage measure-
ments (at the fractional volt level) can be affected by noise. Some customers prefer these low voltages to be displayed
as zero, while others prefer the voltage to be displayed even when the value reflects noise rather than the actual sig-
nal. The C30 applies a cut-off value to the magnitudes and angles of the measured voltages. If the magnitude is below
the cut-off level, it is substituted with zero. This operation applies to phase and auxiliary voltages, and symmetrical
components. The cut-off operation applies to quantities used for metering, protection, and control, as well as those
used by communications protocols. Raw samples of the voltages available via oscillography are not subject cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
as valid measurements. Unless dictated otherwise by a specific application, the default settings of "0.02
NOTE
pu" for
CURRENT CUT-OFF LEVEL
PATH: SETTINGS PRODUCT SETUP
CLEAR RELAY
RECORDS
MESSAGE
MESSAGE
MESSAGE
MESSAGE
Selected records can be cleared from user-programmable conditions with FlexLogic™ operands. Assigning user-program-
mable pushbuttons to clear specific records are typical applications for these commands. Since the C30 responds to rising
edges of the configured FlexLogic™ operands, they must be asserted for at least 50 ms to take effect.
Clearing records with user-programmable operands is not protected by the command password. However, user-program-
mable pushbuttons are protected by the command password. Thus, if they are used to clear records, the user-programma-
ble pushbuttons can provide extra security if required.
For example, to assign User-Programmable Pushbutton 1 to clear demand records, the following settings should be
applied.
1. Assign the clear demand function to Pushbutton 1 by making the following change in the

CLEAR RELAY RECORDS

"
PUSHBUTTON 1 ON
CLEAR DEMAND:
GE Multilin
followed by the
and
CURRENT CUT-OFF LEVEL
and "1.0 V" for
VOLTAGE CUT-OFF LEVEL
CLEAR RELAY RECORDS
CLEAR EVENT RECORDS:
Off
CLEAR OSCILLOGRAPHY?
No
CLEAR DATA LOGGER:
Off
RESET UNAUTH ACCESS:
Off
CLEAR DIR I/O STATS:
Off
menu:
"
C30 Controller System
is "Enabled", the LCD backlighting
SCREEN SAVER FEATURE
SCREEN SAVER WAIT TIME
with care as the relay accepts lower signals
are recommended.
5.2.3 CLEAR RELAY RECORDS
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand.
Valid only for units with Direct I/O module.
5.2 PRODUCT SETUP
, providing that no keys
CURRENT
SETTINGS PRODUCT SETUP
5-9
5