6-22
745 Transformer Management Relay
GE Power Management
6.7 SELF-TEST ERRORS
6 ACTUAL VALUES
6
Table 6–3: SELF-TEST ERROR INTERPRETATION
MESSAGE
SEVERITY
CAUSE
EEPROM Memory
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.
Flexlogic Eqn
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.
DSP Processor
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.
Bad Xfmr Settings
major
This error is caused when the 745 determines that the transformer
configuration programmed via setpoints does not correspond to a realistic
physical system.
Logic Power Out
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.
Analog Output
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.
Not Calibrated
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.
Real-Time Clock
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
S1 745 SETUP / CLOCK
.
Battery
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.
Emulation Software
minor
This error is caused by development software being loaded in the relay.
Int Temperature
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
IRIG-B Failure
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.
Access Denied
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.
Ambnt temperature
minor
This error is caused when ambient temperature is out of range.(–50 to
250ºC inclusive).
Summary of Contents for 745 TRANSFORMER MANAGEMENT RELAY
Page 30: ...2 8 745 Transformer Management Relay GE Power Management 2 3 SECURITY 2 GETTING STARTED 2 ...
Page 210: ...7 36 745 Transformer Management Relay GE Power Management 7 2 BLOCK DIAGRAMS 7 SCHEME LOGIC 7 ...
Page 322: ...9 12 745 Transformer Management Relay GE Power Management 9 3 USING 745PC 9 745 PC SOFTWARE 9 ...
Page 396: ...A 4 745 Transformer Management Relay GE Power Management A 1 FIGURES AND TABLES APPENDIXA A ...
Page 400: ...C 2 745 Transformer Management Relay GE Power Management C 1 WARRANTY INFORMATION APPENDIXC C ...
Page 406: ...vi 745 Transformer Management Relay GE Power Management ...
Page 407: ...GE Power Management 745 Transformer Management Relay NOTES ...
