Error messages, Recommendations, Autotune data in – Omega Engineering CN9400 User Manual
Page 18: Tech, Reading autotune tuning cycle results in
Error Messages
ERROR MESSAGES
Temp
Setpoint
Cycle
75% SP
Start
TUNE
TUNE
Tuning
DAC
PID
New PID
values
entered
Time
(100% output)
oS 1
oS 2
Ct A
Ct b
Ct 3
Ct 4
uS
Ct 1
Ct 2
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
Note:
To reset and clear error press ▲▼ together
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
e.g. Ctb = 0.0 see adjacent diagram.
Action:
1.
Change the conditions. eg. raise setpoint
2.
Try
3. Check SP1.P percentage power
(see IMPROVING CONTROL ACCURACY)
4. If the error message persists, call CAL
for advice.
READING AUTOTUNE TUNING CYCLE
RESULTS IN
tECh
1. Index to
release ▲ or ▼, lower display will alternate
Ct.A
and value
2. Keep ✱ pressed and press ▲ once, the lower
display will alternate
Ct.b
and value (eg. 19.6)
3. Repeat step 3 above to view:
Ct 1, Ct 2, Ct 3, Ct 4, oS 1, uS
and
oS 2
.
Autotune tuning data and limits
14
INPT
DATA
HAND
FAIL
0
CYC.T
ON.OF
TECH
TUNE
AT.SP
TECH
CT.A