GE ALPS - Page 232

9-2 ALPS Advanced Line Protection System
GE Power Management
9.1 SPARES 9 SERVICING
9
Table 9–1: COMPONENTS TESTED DURING START-UP TESTS
COMPONENT METHOD PROCESSO
R
NATURE
Flash Memory (PROM) CRC-type check 960 CPU Critical
EPROM Checksum on DSP board DSP Critical
Local RAM Patterns to check for stuck bits, stuck address lines, cross-
talk between adjacent bits
960 CPU
DSP
Critical
Shared RAM Same as Local RAM Both Critical
Nonvolatile RAM
CAPRAM
Serial RAM
CRC-type check on settin
g
s area; checksum on fault
stora
g
e area:
duplicate locations on serial NVRAM
960 CPU Critical if settin
g
s area or
serial NVRAM
Timer Chip Test all processor timers and their interrupts 960 CPU Critical if ANI lo
g
ic; non-
critical if 960
Interrupt Controller Test all 960 internal interrupts 960 CPU Critical
Serial Chips Wraparound and interrupt tests for serial interface 960 CPU Non-critical
A/D Controller DMA Interface 960 CPU Critical
Di
g
ital Output Circuitry Loop-back test 960 CPU Critical
Di
g
ital Input Circuitry Comparison of bits read via two separate optocouplers 960 CPU Non-critical, turn off pilot
protection
Real-Time Clock Test of real-time clock operation and interrupts 960 CPU Non-critical
Table 9–2: RUN-TIME BACKGROUND SELF-TESTS
COMPONENT METHOD PROCESSOR NATURE
Flash Memory (PROM) CRC-type check 960 CPU Critical, restart
EPROM Checksum type check DSP Critical, restart
RAM Protection values checked for correctness;
Confi
g
urable lo
g
ic checked for validity
960 CPU Critical, restart
Nonvolatile RAM CRC-type check on settin
g
s area 960 CPU Non-critical
CAPRAM Checksum on fault stora
g
e area 960 CPU
Table 9–3: RUN-TIME FOREGROUND SELF-TESTS
COMPONENT METHOD PROCESSOR NATURE
A/D Controller DMA interface 960 CPU Critical
Di
g
ital Input Circuitry Comparison of bits read via two separate
optocouplers
960 CPU Non-critical, turn off pilot
protection
Di
g
ital Output Circuitry Loop-back test 960 CPU Critical, restart
Trip Circuit Continuity Bit read via bus 960 CPU Non-critical
LUI Operator initiated, visual feedback 960 CPU Non-critical