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OM-222 166 Page 42
9-2. Limit Conditions
A limit condition indicates that the system has encountered an open thermocouple or is outside the range of its optimum operating conditions or
parameters. Should a limit condition occur during operation, the yellow Limit LED will flash to indicate a problem. If the active screen on the LCD display
is Run Status or Parameters, a message describing the particular limit condition will appear on the display. If the active screen is Program, press the
Run Status button to display the limit condition.
In a limit condition, the power source will continue to deliver output power and protect itself from damage by reducing the output power. This situation
allows the operator time to determine the best action to correct the problem as described by the limit message on the LCD display.
If a limit condition occurs, there are two selectable options:
S Acknowledge the limit and continue operation.
S Terminate operation to correct the problem causing the limit.
Pressing the Decrease button will acknowledge the limit and continue operation with the existing set up. In the acknowledge state, the yellow
Limit LED will stop flashing and remain on continuously. The LCD display will revert to an active screen once the Program button, Run Status
button, or Parameters
Hz
V
A
kW
button is pressed.
If a new limit condition should occur after the first is acknowledged, the yellow Limit LED will start flashing to indicate a new problem. To display the limit
condition, press the Run Status button and the LCD display will show a message describing the new and previous limit messages.
To obtain additional information regarding the limit condition and suggested solutions to resolve the limit, press the Increase button, and the
LCD display will indicate possible solutions based on the type of limit condition.
If the operator determines that the best course of action is to terminate operation and make suggested changes to the setup to eliminate the limit condi-
tion, press the Stop button. After changes are made to the setup, press the Run button to restart the process.
9-3. Limit Condition Codes
Limit Condition Additional Information
L01: Thermocouple #1 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L02: Themocouple #2 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L03: Thermocouple #3 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L04: Thermocouple #4 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L05: Thermocouple #5 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L06: Thermocouple #6 Open Check for open temperature sensor and repair
Change to back-up temperature sensor
L07: Output Voltage Limit Tighten blanket against pipe surface
L08: Output Voltage Limit Increase number of turns
Increase coil space
Shorten extension cable
Increase insulation width
L09: Output Current Limit Tighten blanket against pipe surface
L10: Output Current Limit Increase number of turns
Decrease coil space
Tighten cable on insulation