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Fault tracing
7.
Fault tracing
When an unusual operating condition is detected by the AC drive control diagnostics, the drive
initiates a notification visible, for example, on the keypad. The keypad will show the ordinal
number of the fault, the fault code and a short fault description.
The fault can be reset with the Reset button on the control keypad or via the I/O terminal. The
faults are stored in the Fault history menu which can be browsed. The different fault codes you
will find in the table below. This fault table presents only the faults related to the fieldbus in use.
The LonWorks option board status LEDs are described in more detail in Chapter 4.1.2
NOTE: When contacting distributor or factory because of a fault condition, always write down
all texts and codes on the keypad display and send a description of the problem together with
the Drive Info File to fieldbus@Honeywell.com.
7.1
Typical fault conditions
Fault condition
Termination resistor
Cabling
Grounding
Connections
Parameter
If you need to contact Honeywell service in problems related to LonWorks, please send a de-
scription of the problem together with the Drive Info File to fieldbus@Honeywell.com.
Possible cause
Missing or excessive termination resis-
tor.
• Supply or motor cables are
located too close to the fieldbus
cable
• Wrong type of fieldbus cable
• Too long cabling
Inadequate grounding.
Faulty connections.
• Excessive stripping of cables
• Conductors in wrong terminals
• Too loose connections of con-
ductors
• Faulty address
• Overlapping slave addresses
• Wrong baud rate
• Wrong control place selected
Table 18. Typical fault conditions
Honeywell • 25
Remedy
Install termination resis-
tors at both ends of the
fieldbus line.
Ensure grounding in all
points on the net
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