GE LPS-D Instruction Manual page 260

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