User`s guide

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.