12.13
Date Code 20090730 Instruction Manual SEL-734 Meter
Testing and Troubleshooting
Meter Self-Tests
Table 12.5 Meter Self-Tests
Self-Test Condition Limits
Meter
Disabled
Alarm
Output
Description
IA, IB, IC, IN, VA,
VB, VC Offset
Warning 50 mV No Pulsed Measures the dc offset at each of the input
channels every 10 seconds.
+5 V PS Failure +5.35 V
+4.65 V
Yes Latched Measures the +5 V power supply every
10 seconds.
–5 V PS Failure –4.65 V
–5.35 V
Yes Latched Measures the regulated –5 V power supply
every 10 seconds.
+2.5 V PS Failure +2.68 V
+2.32 V
Yes Latched Measures the +2.5 V power supply every
10 seconds.
+3.3 V PS Failure +3.53 V
+3.07 V
Yes Latched Measures the +3.3 V power supply every
10 seconds.
+3.75 V PS Failure +4.02 V
+3.48 V
Yes Latched Measures the +3.75 V power supply every
10 seconds.
–1.25V PS Failure –1.33V
–1.16 V
Yes Latched Measures the –1.25 V power supply every
10 seconds.
BATT Warning +2.3 V No Pulse Measures the clock battery voltage.
TEMP Warning –40°C
+85°C
No Measures the temperature at the A/D voltage
reference every 10 seconds.
RAM Failure – Yes Latched Performs a read/write test on system RAM
every 60 seconds.
ROM Failure checksum Yes Latched Performs a checksum test on the meter
program memory every 10 seconds.
CR_RAM Failure checksum Yes Latched Performs a checksum test on the active copy
of the meter settings every 10 seconds.
NONVOL Failure checksum Yes Latched Performs a checksum test on the nonvolatile
copy of the meter settings every 10 seconds.
The following self-tests are performed by dedicated circuitry in the microprocessor and the SEL-734 main board. Failures in these
tests shut down the microprocessor and are not shown in the status report.
Microprocessor Failure Yes Latched The microprocessor examines each program
instruction, memory access, and interrupt.
The meter displays
VECTOR nn on the LCD
upon detection of an invalid instruction,
memory access, or spurious interrupt. The test
runs continuously.
Courtesy of NationalSwitchgear.com
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