Watlow PM PLUS ™ 6 Series PID Integrated Controller

(3) Program Configuration (Ramp/Soak Example)

Taking "Heating up to 150 ° F (30 minutes) → Holding for 60 minutes → Cooling down to 50 ° F (20 minutes)" as an example:

Global settings:

Path: Operations → Setup → Global → Ramp Type, select "Time" (time mode).

Set Guaranteed Soak Enable to "Yes" and Guaranteed Soak Dev. 1 to "2 ° F" (immersion deviation zone).

Step editing:

Step 1 (Ramp): Path → Operations → Profile → Profile 1 Step 1 → Step Type Select "Time", Set Target Set Point to "150 ° F", Hours=0, Minutes=30, Seconds=0.

Step 2 (Soak): Select "Soak" as the Step Type, with Hours=0, Minutes=60, and Seconds=0.

Step 3 (Ramp): Select "Time" for Step Type and set the Target Set Point to "50 °" F”，Hours=0，Minutes=20，Seconds=0。

Step 4 (End): Select "End" for Step Type and "Hold" for End Type (the final set point for insulation).

Start the program: Path → Operations → Profile → Profile Start, select "Profile 1", and the program will start running.

Key points of operation and maintenance

1. Daily operations

(1) Main screen operation

Parameter viewing: The main screen defaults to displaying process values (top column) and set points (bottom column), and can be switched to display output power percentages (such as theme 2/3) through "Home Screen Themes".

Setpoint modification: Simply slide the screen slider or press the ± key to adjust, long press the ± key to quickly increase or decrease (such as quickly adjusting from 75 ° F to 150 ° F).

Mode switching: Path → Operations → Control Mode, switch between Auto, Manual, Off, and directly set the output power (0-100%) in Manual mode.

(2) Program control operation

Program start/pause: Select "Start/Pause" through Function Key (pre configured as "Profile Start/Stop") or panel path ->Operations ->Profile ->Profile Action Request.

Step monitoring: The main screen displays the current step (such as "Step 2 Soak") and the remaining time (such as "00:50:30"), and detailed step information can be viewed through "Profile Status".

Emergency termination: Long press Function Key (if configured as "Profile End") or Path → Profile Action Request, select "End", the program terminates and executes the End Type action.

2. Maintenance and Calibration

(1) Regular maintenance

Cleaning: Wipe the front panel with a dry cloth every month (avoid using corrosive cleaning agents such as alcohol), and check the terminal wiring for looseness every quarter (power off operation).

Sensor inspection: Verify the accuracy of the sensor every six months (such as comparing the displayed value of the controller with a precision constant temperature bath), and adjust the "Calibration Offset" when the deviation exceeds the limit.

Output test: Every year, test the output continuity in the shutdown state (such as connecting Output 1 to the indicator light, setting 50% power in manual mode, and observing whether the indicator light is on or off normally).

(2) Input calibration (taking thermocouple as an example)

Prepare a precision signal source (such as a calibrator that can output J-type thermocouple signals) and a precision multimeter.

After power failure, disconnect the sensor wiring and connect the calibrator to the Analog Input 1 terminal (T1/S1/R1).

After power on, enter calibration mode: Path → Operations → Factory → Calibration → Electrical Input Offset/Slope.

Calibrate low range: The calibrator outputs "0mV" (corresponding to 0 ° C), reads the controller's "Electrical Measurement" value, calculates and inputs the "Electrical Input Offset".

Calibrate high range: The calibrator outputs "50mV" (corresponding to approximately 1000 ° C), reads the "Electrical Measurement" value, calculates and inputs it into the "Electrical Input Slope".

Verification: The calibrator outputs "25mV" (intermediate value), and the controller display value should be consistent with the corresponding value of the calibrator (deviation ≤ 0.1%).

3. Troubleshooting

(1) Common faults and solutions

Possible causes and solutions for the fault phenomenon

No display power supply not connected, fuse burned out, loose terminals. Check the power supply wiring, replace the fuse (if any), and re tighten the terminals

Sensor no reading (display "----") Sensor open/short circuit, input type configuration error. Check sensor wiring, replace sensor, reconfigure "Sensor Type"

No output action control mode is set to "Off", output function configuration error, load fault switch to "Auto/Manual" mode, reconfigure "Output Function", check load (such as heater resistance)

Severe temperature overshoot, improper PID parameters, failure to execute Auto Tune, re execution of Auto Tune, manual increase of proportional band or integration time

Communication failure address/baud rate mismatch, wiring error, terminal resistance not connected. Check communication parameters, check EIA-485 wiring (A/B lines), and connect 120 Ω terminal resistors at both ends of the bus