Watlow Series 146 Temperature Regulator

5. Remote reset wiring

The remote reset switch is provided by the user, and the wiring method refers to Figure 3e in the document (terminals 13, 15, 16, 17, 14). Only the momentary switch meets FM certification requirements, and remote reset may affect the validity of FM certification.

6. System wiring example

Typical system wiring includes components such as power isolation switches, fuses, controllers, sensors, loads (heaters), contactors, solid-state relays, etc. Please refer to the two system wiring schemes in Figure 4 of the document to ensure that the power supply, input, output, and reset circuit wiring are complete and comply with safety regulations.

Model selection and order information

（1） Model Structure

The model format is 146E - (1/2/3) (100-999) - (1/2/3/4) (any three letters/numbers), and the meanings of each part are as follows:

146E: Product series and output type, E=8A electromagnetic relay (Form C type).

Line voltage code: 1=120VAC, 2=230-240VAC, 3=24VAC.

Input and Range Code: Represents sensor type and measurement range, for example:

E-type thermocouple: 619=0-799 ° C (32-1470 ° F).

J-type thermocouple: 601=0-315 ° C (32-600 ° F), 602=0-750 ° C (32-1382 ° F), 615=fixed 315 ° C (600 ° F), etc.

K-type thermocouple: 603=0-1250 ° C (32-2282 ° F), 611=0-600 ° C (32-1112 ° F), etc.

T-type thermocouple: 629=-200-350 ° C (-328-662 ° F), 632=fixed -75 ° C (-103 ° F), etc.

RTD: 101=-73-600 ° C (-100-1112 ° F, 100 Ω), 104=-73-600 ° C (-100-1112 ° F, 1000 Ω), 106=fixed 200 ° C (392 ° F), etc.

Limit mode code: 1=high limit+power-off manual reset, 2=low limit+power-off manual reset, 3=high limit+power-off automatic reset, 4=low limit+power-off automatic reset.

Remote option codes: 0=adjustable control+built-in setting potentiometer, N=adjustable control+no setting potentiometer (provided by the user), S=adjustable control+remote setting potentiometer+remote reset, P=adjustable control+remote setting potentiometer.

（2） Selection precautions

Confirm the on-site power supply voltage and select the corresponding line voltage code (1/2/3).

Select the sensor type (thermocouple/RTD) and corresponding range code based on the temperature measurement range and accuracy requirements, and specify the target temperature for the fixed set point.

Select the limit mode (high/low limit) and power-off reset mode (manual/automatic) according to safety control requirements.

Select remote options according to installation and operation requirements (built-in/remote setpoints, whether remote reset is required).

The warranty period for electromagnetic relays is usually 100000 closing operations, and the service life needs to be evaluated in conjunction with the load switching frequency.

Troubleshooting and Maintenance

（1） Common faults and solutions

Possible causes and solutions for the fault phenomenon

Load cannot start sensor open circuit maintenance or replacement of sensor

Check if the fuse, circuit breaker, load, and wiring of the load circuit are normal for an open circuit

Check the AC input connection according to the "Power Wiring" section (page 3) if it is not connected or connected incorrectly. If it is not connected, reconnect it

The load cannot be turned off. Connect the thermocouple correctly by reversing the thermocouple according to the "Input Wiring" section (page 4)

Controller failure cuts off the power supply of the controller and removes it from the system, only supplying power to the system; If the load is turned off, it indicates a controller malfunction and needs to be returned to the factory for repair; If the load is still running, it indicates that there are other faults in the system. Please contact the factory for consultation

（2） Maintenance

Regularly check whether the wiring terminals are loose, whether the sensors are damaged or aged, and ensure reliable connections.

Keep the controller clean, avoid dust and oil accumulation, and stay away from corrosive environments and severe vibrations.

Regularly verify the accuracy of set points and the reliability of output actions, and promptly troubleshoot sensor or wiring issues if any abnormalities are found.