Watlow Series PD Ethernet Enabled Temperature and Process Manual do Utilizador descarregar pdf (Página 25)

Watlow Series PD ■ 23 ■ Chapter 5 Troubleshooting

Indication Probable Cause(s) Corrective Action

Alarm will not activate or

clear.

•

Controller is in Error condition.

•

Alarm is in latched setting.

•

Alarm is silenced.

•

Incorrect configuration.

•

Incorrect wiring.

•

Wrong output type.

•

Defective controller.

•

Determine cause of error and correct.

•

Wait for process to return to normal

and acknowledge alarm.

•

Wait for process to return to normal

and alarm will work correctly.

•

Configure Alarm, Alarm Set Point, Hys-

teresis, Silencing and Latching.

•

Correct wiring.

•

Replace controller with correct output

type.

•

Repair or replace controller.

Controller's process value

reading is decreasing as the

actual process is increasing.

•

Thermocouple is reversed wired.

•

Analog voltage or current input scal-

ing is reversed.

•

Check thermocouple wire for correct po-

larity.

•

Configure correct scaling on Input page.

Controller does not control

close enough to set point.

•

PID values incorrect.

•

Cycle times incorrect.

•

Heat or cooling capacity incorrectly

sized for application.

•

Incorrect sensor placement.

•

Controller is in Manual mode (open

loop).

•

Control loop action configured incor-

rect.

•

Tune controller (Auto Tune or Manual

Tune).

•

Set cycle time to match hardware on

Control Loop .

•

Size energy sources to match load.

•

Place sensor in optimal location.

•

Change to Auto mode (closed loop) on

Monitor page.

•

Configure Control Loop Action on Con-

trol Loop page.

Output cycles (turns on and

off) too frequently.

• Wrong control mode. PID control se-

lected instead of ON-OFF control.

• The cycle time is set too short.

• Activate ON-OFF control on Output

page.

• Increase Output Cycle Time on Out-

put page.

Cannot access Security, Mon-

itor, Configuration or Cali-

bration page.

•

Password is enabled and incorrect

password is supplied.

•

Provide the correct user name and pass-

word.

Process value reads incor-

rectly

• Analog input is configured incorrectly.

• Thermocouple sensor shorted.

• Process sensor scaled incorrectly.

• Calibration offset is incorrect.

• Sensor is wired incorrectly.

• Controller calibration is incorrect or

corrupt.

• Defective controller.

• Configure control for appropriate sen-

sor input on Analog Input page.

• Repair wiring or replace sensor.

• Set scaling on Analog Input page.

• Correctly set calibration offset.

• Wire sensor per wiring section.

• Recalibrate controller.

• Repair or replace controller.

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