Controller Failure Symptoms; Table 7-4 Controller Failure Symptoms - Honeywell UDC3500 Product Manual

Troubleshooting/Service
7.6

Controller Failure Symptoms

Introduction
In addition to the error message prompts, there are failure symptoms that can be
identified by noting how the controller displays and indicators are reacting.
Symptoms
Compare your symptoms with those shown in Table 7-4.
Upper
Display Display
Blank
OK
Displayed
OK
disagrees
with Controller
OK
OK
OK
OK Displayed
disagrees with
First Current
OK Displayed
disagrees with
Second Current
OK Displayed
disagrees with
Third Current
Display does not change when a key is pressed
316

Table 7-4 Controller Failure Symptoms

Lower Indicators
Blank Off
OK
OK
Output
Output
OK
OK
OK OK
OK
Output
Output
OK
Output
Output
OK
Output
Output
UDC3500 Universal Digital Controller Product Manual
Controller Probable
Output Cause
None Power Failure
Current
Proportional Output
Controller
Position
Output
Proportional or
disagrees
TPSC Output
with Displayed
Output
Time Proportional
Output
Current/Time
Proportional Output
External Alarm Malfunction in
function does alarm output
not operate
properly
Controller
First Current
Current Output
Output
#1 disagrees
with Displayed
First Current
Output
Controller
Second Current
Current Output
Output
#2 disagrees
with Displayed
Second Current
Output
Controller Third Current
Output Output
disagrees with
Displayed Third
Current Output
Keyboard
Malfunction
Trouble-
shooting
Procedure
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.7.6
7.7.2
7.7.2
7.7.2
7.7.7
3/07