Clear Relay Records - GE C30 Instruction Manual

CHAPTER 5: SETTINGS
— To extend phosphor life in the vacuum fluorescent display, the brightness can be
DEFAULT MESSAGE INTENSITY
attenuated during default message display. During keypad interrogation, the display always operates at full brightness.
and
SCREEN SAVER FEATURE SCREEN SAVER WAIT TIME
(LCD) and control its backlighting. When the
followed by the
DEFAULT MESSAGE TIMEOUT
target messages are active. When a keypress occurs or a target becomes active, the LCD backlighting turns on.
— This setting modifies the current cut-off threshold. Very low currents (1 to 2% of the rated value)
CURRENT CUT-OFF LEVEL
are very susceptible to noise. Some customers prefer very low currents to display as zero, while others prefer the current to
display 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 substituted with zero. This applies to
phase and ground current phasors as well as true RMS values and symmetrical components. 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
samples available via oscillography are not subject to cut-off.
— This setting modifies the voltage cut-off threshold. Very low secondary voltage measurements
VOLTAGE CUT-OFF LEVEL
(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 signal. 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 to cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
valid measurements. Unless dictated otherwise by a specific application, the default settings of "0.02 pu" for
NOTE
CURRENT CUT-OFF LEVEL

5.3.3 Clear relay records

SETTINGS  PRODUCT SETUP  CLEAR RELAY RECORDS
 CLEAR RELAY
 RECORDS
Selected records can be cleared from user-programmable conditions with FlexLogic operands. Assigning user-
programmable pushbuttons to clear specific records is a typical application 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-
programmable pushbuttons are protected by the command password. Thus, if they are used to clear records, the user-
programmable pushbuttons can provide extra security if required.
For example, to assign user-programmable pushbutton 1 to clear demand records, apply the following settings.
1. Assign the clear demand function to pushbutton 1 by making the following change in the
 CLEAR RELAY RECORDS
: "
CLEAR DEMAND PUSHBUTTON 1 ON
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
— These settings are only visible if the C30 has a liquid crystal display
SCREEN SAVER FEATURE
SCREEN SAVER WAIT TIME
and
CURRENT CUT-OFF LEVEL
and "1.0 V" for
VOLTAGE CUT-OFF LEVEL
CLEAR EVENT RECORDS:

Off
CLEAR OSCILLOGRAPHY:

No
CLEAR DATA LOGGER:

Off
RESET UNAUTH ACCESS:

Off
CLEAR DIR I/O STATS:

Off
menu:
"
is "Enabled," the LCD backlighting turns off after the
, provided that no keys have been pressed and no
setting value. Raw current
CURRENT CUT-OFF LEVEL
with care as the relay accepts lower signals as
are recommended.
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Visible only for units with Direct I/O module
SETTINGS  PRODUCT SETUP
PRODUCT SETUP
5
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