Watlow Series D8 - Manual (Page 160)

Chapter 6: Menu and Parameter Reference Series D8 User’s Guide
142 Watlow Anafaze Doc. 0600-3120-2000
Sensor Fail Heat/Cool Output
A loop will switch to manual mode at the specified output
power if one of the following conditions occurs while in auto-
matic mode:
•
A failed sensor alarm occurs, or
• The mode override input becomes active (see Mode
Override on page 127).
• DeviceNet connection becomes inactive unexpectedly.
For most applications, this parameter should be set to 0% for
both heat and cool outputs.
Values:
0 to 100% (0 to 1000). Values in parentheses are for
communications.
Default:
0% (0)
Decimal Placement for DeviceNet:
See Decimal Placement
for Percentage Values on page 60.
DeviceNet Object:
Output (65 hex)
WARNING! Do not rely solely on the failed sensor alarm
to adjust the output in the event of a sensor
failure. If the loop is in manual mode when a
failed sensor alarm occurs, the output is not
adjusted. Install independent external safety
devices to shut down the system if a failure
occurs.
Open Thermocouple Heat/Cool Output Average
If you set this parameter to on and a thermocouple open alarm
occurs, a loop set to automatic control mode will switch to
manual mode at the average output prior to the alarm.
Values:
on (1) or off (0). Values in parentheses are for com-
munications.
DeviceNet Object:
Output (65 hex)
l01 Sensor failr
heat outputb 0%
l01 Open T/C htr
out average boff