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1. TEMPERATURE SENSING COMPONENT DESCRIPTIONS
• Exhaust RTD (Resistance Temperature Device)- Sens1
The RTD (Resistance Temperature Device), used throughout the ADS-464 are identical. The main
function is to measure temperatures and to transfer this information to a measuring devices for further
processing. The RTD used on the ADS-464 are rated for 1100° F (593.3° C).
• Sens2 = Exhaust Temperature Sensor
The exhaust RTD (Resistance Temperature Device) is located in the ADS-464 burner area exhaust duct
and also has electrical disconnects in a junction box for ease of replacement.
• Exhaust 4 to 20 milliampere (4 to 20 mA) transmitter - Trans1
This transmitter is located on the upper right of the main electrical enclosure panel. The intake and
exhaust RTD (Resistance Temperature Device) are respectively connected in series with a 24 volt DC
power supply, and the current drawn from the power supply is 4 to 20 milliampere (4 to 20 mA) output
signal which is proportional to the input signal. The proportional current information is the connected to
the PLC (Programmable Logic Controller) for processing. Refer to the ADS-464 Ladder Diagram for
circuit information.
• 24 Volt DC Power Supply
The 24 volt power supply used in the ADS-464 is an individual grade switching power supply, rated for
120 volts AC input and 24 volts DC output. Features this device incorporates are:
• Overload protection to protect the load
• Internal failure protection to protect itself
• An output status indicator; this L.E.D. (light emitting diode) indicates the presence of DC output
voltage.
• PLC (Programmable Logic Controller) Analog Input Module - Module #2
This device, attached to the PLC , receives the 4 to 20 milliampere (4 to 20 mA) temperature information
and processes this information for the PLC
• Temperature Measurement and Sensing Problems
An “EXHAUST DSFL” MESSAGE is displayed on the operator terminal any time a respective temperature
measurement has exceeded the programmed temperature in the PLC (Programmable Logic Controller).
A “DSFL” message will stop the current drying cycle and prevent a drying cycle from starting.
2. EXHAUST “DSFL” MESSAGE
a) PROBABLE CAUSES;
1a) Defective RTD (Resistive Temperature Device) Probe
2a) Defective 24 Volt DC Power Supply