beautypg.com

Setting up alarms, Failed sensor alarms, Setting up alarms 93 – Watlow Series D8 User Manual

Page 111: Failed sensor alarms 93

background image

Series D8 User’s Guide

Chapter 4: Operation and Setup

Doc. 0600-3120-2000

Watlow Anafaze

93

5. Access the setup menus (see page 86). Go to the Input fil-

ter

parameter in the Input menu. Write down the value,

and then change it to 0 scans. Press . to save the new

setting.

6. Press x twice to return to the loop display.
7. Set the Mode parameter to tune (see page 85).
8. The controller will automatically return to the loop dis-

play. The word tun flashes throughout the tuning process.

When tuning is complete, the control mode indicator

changes to auto.

9. Adjust the set point to the desired operating temperature

(see page 84).

10. Restore the Input filter parameter to its original value.

Setting Up Alarms

The D8 has three main types of alarms:

Failed sensor alarms

Process alarms

System alarms

Failed Sensor Alarms

Failed sensor alarms alert you if one of the following condi-

tions occurs:

Thermocouple open

Thermocouple shorted (must be enabled)

Thermocouple reversed (enabled by default)

RTD open positive input or open negative input

RTD short between the positive and negative inputs

What Happens if a Failed Sensor Alarm Occurs?

If a failed sensor alarm occurs:

The controller switches to manual mode at the output

power indicated by the Sensor fail heat output and Sen-
sor fail cool output

parameters in the Output menu. (The

output power may be different for a thermocouple open

alarm; see Thermocouple Open Alarm below.)

The controller displays an alarm code and alarm message

on the display. See Alarm Displays on page 81.

The global alarm output is activated.