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DCM-2 HART INTERFACE Maintenance - Troubleshooting
ELECTRONICS DIAGNOSTICS -- CHART 2
WILL BOARD
COMMUNICATE?
IS POWER (”PWR”)
LED LIT?
WILL DCM BOARD
COMMUNICATE?
HAS ERROR BEEN
ELIMINATED?
ARE ANY HART
ERROR MESSAGES
DISPLAYEDONTHE
COMMUNICATOR?
DOES THE DISPLAY-
ED “DEMAND” IN %
CORRESPOND TO
EXPECTED VALUE?
IS PROPER DC SIG-
NAL VOLTAGE PRES-
SENT ACROSS TER-
MINAL AA+, BB-?
IS PROPER DC
VOLTAGE
PRESENT?
DOES THE “RAW
POS” VOLTAGE
CORRESPOND TO
THE DRIVE POS?
DOES THE DRIVE
APPEAR TO
OSCILLATE ABOUT
A FIXED POINT?
DOES “LOOP (DEM)”
IN mA CORRESPOND
TO THE EXPECTED
DRIVE DEMAND
INPUT SIGNAL?
DOES THE DISPLAY-
ED “POSITION” IN %
CORRESPOND TO
EXPECTED DRIVE
POSITION IN %?
DOES COMMUNI-
CATOR DISPLAY
“NO DEVICE FOUND”
MESSAGE?
DO LEDs LIGHT
ALTERNATELY
WITH DRIVE
CYCLE?
IS PROPER
VOLTAGE PRESENT
(0-100% = 1-5 V)?
VIEW ALL
DYNAMIC INFOR-
MATION DISPLAYED
IN THE “ONLINE”
MENU
REMOVE
DCM COMPART-
MENT COVER TO
VIEW LEDs
CONNECT
HART COMMUNI-
CATOR & ESTABLISH
COMMUNICATIONS
GO TO THE
“DETAILED STATUS”
MENU UNDER DIAG-
NOSTICS AND VIEW
THE “RAW POS”
PARAMETER
GO TO THE
“DETAILED STATUS”
MENU AND VIEW
THE CW & CCW
“MOVEMENT
INHIBITORS"
PUT CON-
TROLLER IN
MANUAL MODE AND
CHECK THE HART
COMMUNICATOR
PER FIG, P.35
INDICATES THAT
THE DEMAND SIG-
NAL TO THE DRIVE
IS OUTSIDE THE
CALIBRATED RANGE
OR LOST
-- VERIFY SIGNAL
-- CHECK DEMAND
CAL
-- RECAL. DEMAND
IF NECESSARY
ANY PARAMETERS
THAT DISPLAY “ON”
STATUS INDICATE
THAT IT IS PREVENT-
ING THE DRIVE
FROM MOVING --
READ PARAMETERS
AND ACT ACCORD-
INGLY
CALL FACTORY FOR
ASSISTANCE
SET TO “ALWAYS
POLL” SEE PG.36
CHECK DRIVE DE-
MAND CALIBRATION
& RECALIBRATE IF
NECESSARY
REMOVE
COMPART-
MENT COVER AND
VIEW “FWD” &
“REV” LEDs
DCM
CHECK FOR
SOURCES OF
SIGNAL NOISE
AND CORRECT
REPLACE
SLM
CHECK POSITION
CALIBRATION AND
RECALIBRATE IF
NECESSARY
REPLACE CPS
CALL FACTORY
FOR ASSISTANCE
CHECK/REPAIR CON-
TROLLER OR SIGNAL
SOURCE & WIRING
CHECK VOLTAGE AT
TEST POINTS
TP2(+) & TP1(-)
SEE FIG, P.78
DCM
CHECK VOLTAGE AT
DCM TEST POINTS
TP4(+) & TP1(-)
SEE FIG, P.78
CALL FACTORY
REPLACEDCM
CONSULT
FACTORY
REPLACE DCM
BOARD
DEMAND SIGNAL
OUT OF RANGE
NEXT
PREV
DISPLAY
A2
A2
B2
YES
YES
YES
YES
YES
YES
YES
YES NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
NO
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