Error Messages; Recommendations - Omega Engineering CN9400 User Manual

ERROR MESSAGES

SENSOR FAULT
Upper display alternates: inPt and FAiL
Indicates: thermocouple burnout RTD/Pt100 open or
short circuit or negative over-range.
Action: Check sensor/wiring
NON-VOLATILE MEMORY ERROR
Upper display alternates: dAtA and FAiL
Action: De-power briefly. Replace unit if problem
persists
MANUAL POWER ERROR
Upper display alternates: hAnd and FAiL
SP1 set to ON/OFF in CYC.t
Action: Select proportional mode
IMMEDIATE FAIL ON AUTOTUNE START
Upper display alternates: PV tunE and FAiL
Lower display 0
1. No setpoint entered.
Action: Enter setpoint
2. SP1 set to ON/OFF in
Action: Select proportional mode
To reset and clear error press
Note:
briefly to cancel message.
FAIL LATER DURING AUTOTUNE CYCLE
The thermal characteristics of the load exceed the
Autotune algorithm limits. The failure point indicated
by any display 0.0 in
14
e.g. Ctb = 0.0 see adjacent diagram.
Action: 1. Change the conditions. eg. raise setpoint
INPT
DATA READING AUTOTUNE TUNING CYCLE
RESULTS IN tECh
1. Index to
HAND
2. Keep
3. Repeat step 3 above to view:
FAIL
0
Autotune tuning data and limits
CYC.T
ON.OF
together
TECH
2. Try
3. Check SP1.P percentage power
(see IMPROVING CONTROL ACCURACY)
4. If the error message persists, call CAL
for advice.
, lower display will alternate Ct.A
release or
and value
pressed and press once, the lower
display will alternate Ct.b and value (eg. 19.6)
Ct 1, Ct 2, Ct 3, Ct 4, oS 1, uS and oS 2.
Temp
DAC
Setpoint
oS 1
Tuning
TUNE
Cycle
75% SP
Start
TUNE
TUNE
AT.SP
TECH
CT.A
PID
oS 2
New PID
values
entered
uS
Time
(100% output)