Note: Do not modify system parameters or disturb the process while auto-tuning is running. 6. Troubleshooting and Error Codes
Fenwal Continuous Fire Detection (CFD) P/N 35xxx-y-255 and equivalent core architectures Operational Modes & Core Physics
unit : Temperature scale selection ( C for Celsius, F for Fahrenheit) or linear scaling parameters. dp : Decimal point position configuration ( 0 , 0.0 , 0.00 ). 9240si loop controller user manual
: Keep the unit away from metal shavings or wire clippings during maintenance, as these can cause internal shorts.
Select your sensor type (e.g., "K" for K-type thermocouple). Unit: Choose between Celsius (°C) and Fahrenheit (°F). Ctrl (Control Mode): Choose between PID or On/Off control. 5. Auto-Tuning (AT) Note: Do not modify system parameters or disturb
If working in low-light environments, press the backlight toggle key to illuminate the active LCD display. Phase 2: Connecting to the Fire Detection Loop
Select your primary sensor. Options include tC-K (Type K Thermocouple), Pt10 (PT100 RTD), or 4-20 (Linear milliamp). dp : Decimal point position configuration ( 0 , 0
A "loop controller" (often single or dual loop) typically:
Forcing the controller into manual output mode via external PLC relays. Troubleshooting and Error Code Reference
Measures parallel resistance and parallel capacitance to detect faults.