Terminology And Function Descriptions - Omron CQM1 Operation Manual

Terminology and Function Descriptions

2-4 Terminology and Function Descriptions
Manual Manipulated Variable
Heater Burnout Alarm
4. Do not use any settings other than those specified above.
5. The set points and input shift values will change as follows if the input type
is changed:
• The set points will be clamped at the upper or lower limit if the setting
range is exceeded.
• The decimal points will be adjusted if the range is changed to another
range with a different number of decimal places.
Example: If pin 1 on SW2 is turned ON, the K thermocouple range will
be changed from –200 to 1,300 C to 0.0 to 500.0 C. If a set point was
previously 200 C, it will be changed to 20.0 C.
The manual manipulated variable can be used only as a time-proportional
ratio. Control is continued based on the final output level when automatic con-
trol (ON/OFF or advanced PID) is switched to manual operation. This function
enables the output to be controlled artificially without using RUN or STOP
commands or altering the input status (e.g., for sensor errors). An example of
application is shown below.
Output
0%
Auto
• The heater burnout alarm output is a latched output. To reset the heater
burnout alarm output, either set the heater burnout alarm set value to 0.0
or turn the power supply to the Unit OFF and then back ON.
• The heater burnout alarm settings are shown in the following table.
Setting
0.0
0.1 to 49.9
50.0
• Heater Current
If the heater current reaches 55.0 A or higher, a CT input error will occur
and E500 will be output if the heater current is being monitored.
• The current at which a heater burnout will be detected is calculated as fol-
lows:
Set value = (Normal current + current after burnout)/2
• The following condition must be met:
Normal current – current after burnout
Manual manipulated variable changed
Manual
Auto
Changed Changed
Operation
Heater burnouts will not be detected. The heater burn-
out alarm output will turn OFF. This setting is used to
reset an alarm.
The detection level for heater burnout alarms.
Heater burnouts will not be detected. The heater burn-
out alarm output will turn ON regardless of RUN/STOP
status. This setting can be used to check wiring.
Section 2-4
2.5 A
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