GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual page 172

6.7 SELF-TEST ERRORS
Table 6–3: SELF-TEST ERROR INTERPRETATION
MESSAGE
EEPROM Memory
Flexlogic Eqn
DSP Processor
Bad Xfmr Settings
Logic Power Out
Analog Output
Not Calibrated
Real-Time Clock
6
Battery
Emulation Software
Int Temperature
IRIG-B Failure
Access Denied
Ambnt temperature
6-22
SEVERITY CAUSE
major This error is caused by detection of corrupted location in the 745 data
memory which cannot be self-corrected. Errors that can be automatically
corrected are not indicated. Any function of the 745 is susceptible to
misoperate from this failure.
major This error is caused when an error in FlexLogic is detected. No feature of
the 745 that is controlled by FlexLogic will operate when this failure
occurs. Programming correct FlexLogic equations will remove this error.
major This error is caused when communications with the internal digital signal
processor is lost. Most of the monitoring capability of the 745 (including all
measurement of current) will be lost when this failure occurs.
major This error is caused when the 745 determines that the transformer
configuration programmed via setpoints does not correspond to a realistic
physical system.
minor This error is caused by failure of the +32 V DC power supply used to
power dry contacts of logic inputs. Logic inputs using internal power are
affected by this failure. This may be caused by an external connection
which shorts this power supply to ground.
minor This error is caused by failure of the +32 V DC power supply used to
power analog outputs. Analog output currents are affected by this failure.
minor This error message appears when the 745 determines that it has not been
calibrated. Although the relay is fully functional, the accuracy of measured
input values (e.g. currents and line voltage) as well as generated outputs
(e.g. analog outputs) is not likely to be within those specified for the relay.
minor This error is caused when the 745 detects that the real-time clock is not
running. Under this condition, the 745 will not be able to maintain the
current time and date. This would normally occur if backup battery power
for the clock is lost and control power is removed from the 745. Even if
control power is restored, the clock will not operate until the time and/or
date are programmed via
minor This error is caused by the loss of battery power to the real-time clock.
The ability of the 745 to maintain the current date and time without control
power is lost.
minor This error is caused by development software being loaded in the relay.
minor This error is caused by the detection of unacceptably low (less than
–40°C) or high (greater than +85°C) temperatures detected inside the unit
minor This error is caused when the IRIG-B signal type selected does not match
the format code being injected into the IRIG-B terminals.
minor This error is caused when the passcode is entered incorrectly three times
in a row from either the front panel or any of the communication ports. This
error may be removed by entering the correct passcode.
minor This error is caused when ambient temperature is out of range.(–50 to
250ºC inclusive).
745 Transformer Management Relay
6 ACTUAL VALUES
S1 745 SETUP / CLOCK .
GE Power Management