Loop Break Alarm - Omega CN9000A Series User Manual

If EE8 or EE9 do not clear themselves, the following can be
attempted. Disconnect power and make sure that the jumper is in
the unlocked position (across center and right pins under the key
pad). Then press P key and keep pressing it. Finally reconnect
power for 10 seconds, and release P key. This will clear memory.
All functions will go to default state and must be reprogrammed.
PRESS simultaneously to reset latched message.
If you have any other problems, contact the OMEGA Customer
Service Department at 1-800-622-2378 or (203) 359-1660.

4.2 LOOP BREAK ALARM

The Loop Break Alarm (LBA) detects a control loop fault, and
displays an error message (EE3). In addition the SP2 relay may be
configured to act in the LBA state. Note that the SP1 output state
is unaffected by LBA alarm condition.
The LBA operates if the controller fails to receive a correct
response to the output within a limited time period. Specifically, the
LBA state occurs when the SP1 output is at 0% or 100%, and is
unresponsive within the LBA waiting time specified in Function .12.
The controller is considered to be unresponsive if the process
temperature fails to move a minimum of 50% of the proportional
band (or hysteresis if SP1 is in the ON/OFF mode). Figure 4-1
shows the kinds of faults detected by the LBA.
Figure 4-1. Typical faults detected by LBA
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