Watlow EZ-ZONE ® PM PID controller

Configuration file page: Long press the forward button for 6 seconds to enter, used for editing the slope insulation program (up to 4 files, 40 steps).

Factory page: Press and hold the forward key+infinite key for 6 seconds to enter, used for advanced functions such as calibration, password locking, and customizing the homepage.

Core functional configuration

（1） Input configuration (Settings page - Analog Input menu)

Sensor type (sEn): Select thermocouple (such as J-type), RTD (100 Ω/1k Ω), potentiometer, etc.

Range setting (r. Lo/r. hi): defines the measurement range of the input signal, such as 0-100 ° C.

Filter time (fiL): 0.0-60.0 seconds, used to smooth the input signal and reduce interference.

（2） PID control configuration

Control mode (C. ∧Џ): Supports automatic (closed-loop) and manual (open-loop) modes.

PID parameter adjustment:

Proportional band (h.pb/C.pb): 25.0 ° F (default), the smaller the value, the more sensitive the control.

Integral time (ti): 180 seconds/time (default), eliminating static errors.

Differential time (td): 0 seconds (default), suppresses overshoot.

Self tuning function (aUt): After activation, the controller automatically optimizes PID parameters, suitable for initial configuration or changes in operating conditions.

（3） Alarm configuration (Settings page - Alarm menu)

Alarm type (a.ty): Process alarm (triggered by fixed value) or deviation alarm (relative to set value).

Alarm threshold (a.Lo/a.hi): Set the trigger value for high and low alarms, such as a high temperature alarm of 300 ° F.

Alarm action (a.Lg): When an alarm occurs, output Energize (engaged) or De energize (disconnected).

Auxiliary functions: Supports locking (a. La), muting (a. Si), blocking (a. bL), etc., to avoid false alarms.

（4） Configuration file (slope insulation)

Step types: including heating (ti), insulation (SoAH), waiting for events (Ø І. E), jump (JL), etc.

Editing process: Enter the configuration file page, select the step type, and set parameters such as target temperature, time, and event output.

Startup method: The configuration file can be launched through the homepage, operation page, function keys, or numerical input.

Maintenance and troubleshooting

（1） Daily maintenance

Regularly check the tightness of the wiring to avoid looseness caused by vibration.

Sensor calibration: Use the calibration menu (CaL) on the factory page to input standard signals for offset and slope calibration.

Parameter backup: Save the parameters to User Set 1/2 through the Settings page Global menu (gLbL) for easy recovery after a failure.

（2） Common fault handling

Possible causes and solutions for fault indication

No display, power supply not connected, fuse blown. Check the power supply and replace the fuse

Alarm cannot be cleared. Alarm lock is activated, not restored to safe range. Release lock or wait for process value to return to threshold

No output action output function setting error, wiring error check output function configuration, rewiring

Process value deviates from set value, PID parameters are not optimized, sensor failure executes self-tuning, sensor inspection

Communication failure protocol mismatch, wiring error Unified communication protocol (such as Modbus RTU), check wiring