Error Messages; Broken Analog Output Current Loop - ABB Command Series Instruction Manual

Board or Display
Test Description
Main board OPT BRD
(continued)
Serial port SER PRT
Operator SRAM [FAIL]
interface
EEPROM
board
[FAIL]
ROM 1 [FAIL]
ROM 2 [FAIL]
I/O tests READ AI
READ DI
SET DO
BYP AO
Keypad test KEYPAD

ERROR MESSAGES

BROKEN ANALOG OUTPUT CURRENT LOOP

TROUBLESHOOTING AND DIAGNOSTICS
Table 6-1. Diagnostic Tests
Checking Procedures
Checks to see if option board is installed.
Checks to see if serial port is installed.
None.
Replace ROM (XU18).
Replace ROM (XU6).
Enter and verify the values on screen
display are correct.
Set from 0 to 100%. Verify reading at
termination unit terminal block.
Enter and verify that values on screen
display are correct.
Set digital outputs to 0 or 1. Verify reading
at termination unit terminal block.
Check ribbon connector cable between
operator interface board and main board.
Press each key on the controller faceplate.
Screen display will echo key depressed.
Error messages appear on the faceplate display through menu selec-
tions. DIAGNOSTICS in the setup menu and STATUS in the monitor
menu both provide error information.
If the Type CTT terminal is being used with the controller, refer to the
CTT Configuration and Tuning Terminal
sages and recovery actions.
1. To detect a break in the analog output current loop, go to the
MONITOR AO screen.
2. If a break has occurred, check the termination unit connections
for a break.
3. Repair or replace any broken connections. If no break is evident,
refer to Section 8 for instructions on removing the circuit boards and
replace the main board.
During the start-up routine, the controller remains in bypass. The
operator has control of the analog outputs from the process display
faceplate.
(continued)
Corrective Action
None.
None.
Replace operator interface
board (refer to
If test still fails, replace
operator interface board (refer
to Section 8).
If not correct, refer to
Section 8.
Replace operator interface
board (refer to
Replace faceplate assembly
(refer to Section
instruction for error mes-
ERROR MESSAGES
Section 8).
Section 8).
8).
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