Rockwell Automation 1901 SyncPro - Manual (Page 47)

Chapter
7
Troubleshooting
Last Trip Table To aid in troubleshooting, the unit stores the last 10 recorded
faults. These can be accessed by viewing the contents of the data
file N22:0, (refer to the DTAM manual 1747-ND013 for
information on data table access). This file forms a circular queue
from N22:1 to N22:10 such that when full, the oldest fault is
discarded making room for the newest.
The value in N22:0 gives the most recent fault. For example:
N22:0 has the value of 6. The most recent fault is found in N22:6,
the one preceding it at N22:5. The fault at N22:10 precedes the
fault at N22:1 in a circular fashion.
The faults are denoted by the following fault codes:
Table 7.A – Last Trip Codes
Fault Code Description
1 Phase Lag (Pull Out)
2 Squirrel-Cage Protection Trip
4 Incomplete Start Sequence Time Exceeded
8 Power Factor Transducer Ckt
16 Pulse Board 24 V Failure
32 Field Voltage Loss
64 Field Current Loss
128 No Field Coil Feedback
256 Reversed PF @ SyncPro
512 External Hardware Fault
1024 Pulse Board Positive pulse missing
2048 Pulse Board Negative pulse missing
4096 Contactor Feedback
8192 Set Point Data Lost
If more than one fault occurs simultaneously, the value shown
will be the total of the last trip codes. ie. if Field Current Loss
coincided with a Pull Out, the value would be 64+1=65.
1901-UM020C-EN-P – June 2013