User`s guide

Series D8 User’s Guide Chapter 7: Troubleshooting and Reconfiguring
Doc. 0600-3120-2000 Watlow Anafaze 161
alarm, turns on the global alarm output. The global alarm re-
mains on until the alarm is acknowledged. The message per-
sists until the condition is corrected and the alarm is
acknowledged.
The D8 displays the following system alarm messages:
• Low power: See Low Power on page 163.
• Battery dead: See Battery Dead on page 163.
• H/W error: Ambient: See H/W Error: Ambient on page
165.
• H/W error: Gain: H/W Error: Gain or Offset on page
164.
• H/W error: Offset: See H/W Error: Gain or Offset on
page 164.
Other Behaviors
Table 7.2 indicates potential problems with the system or con-
troller and recommends corrective actions.
Table 7.2 Other Symptoms
Symptom Possible Causes Recommended Action
Indicated tempera-
ture not as expected
Controller not communicating
Sensor wiring incorrect
Noise
See Checking Analog Inputs on page 166.
D8 display is not lit
Power connection incorrect
Check wiring and service. See Wiring the
Power Supply on page 23.
Failed flash memory chip
Replace the flash memory chip. See
Replacing the Flash Memory Chip on page
170.
D8 damaged or failed
Return the D8 for repair. See Returning a
Unit on page 158.
D8 display is lit, but
keys do not work
Keypad locked See Keys Do Not Work on page 166.
Unacknowledged alarm
An alarm condition exists and has not been
acknowledged. See How to Acknowledge
an Alarm on page 82.
D8 damaged or failed
Return the D8 for repair. See Returning a
Unit on page 158.