Rockwell Automation 1756-DMF30 ControlLogix Drive Module - Manual (Page 249)

Publication 1756-UM522B-EN-P - February 2003
1756-DMD30 Specific Information B-169
Parameter 2124 [Pwr Device Status]
The bits of this parameter indicate which SCR has shorted or not
firing. If an SCR is shorted parameter 2122 [MC Faults] bit 0 [SCR
Fault] will be set. If an SCR is not firing correctly parameter 2123 [MC
Warnings] bit 0 [BrdgNotFirng]will be set.
For a regenerative drive, this parameter indicates the pair of SCRs that
has faulted. For a non-regenerative drive, this parameter indicates the
specific SCR that has faulted.
The bits of this parameters are set when a fault event is detected.
They stay latched until bit 19 [Clear Fault] of parameter 152 [Applied
Logic Cmd] or bit 19 [Clr Drv Wrn] of parameter 166 [Motor Ctrl Cmd]
is set. If the fault event remains present, the identifying bit is set
again.
Bit Fault Name Fault Description
0 SCR 1 Fault SCR 1 Fault (Forward Bridge)
1 SCR 2 Fault SCR 2 Fault (Forward Bridge)
3 SCR 3 Fault SCR 3 Fault (Forward Bridge)
4 SCR 4 Fault SCR 4 Fault (Forward Bridge)
5 SCR 5 Fault SCR 5 Fault (Forward Bridge)
6 SCR 6 Fault SCR 6 Fault (Forward Bridge)
7 SCR 11 Fault SCR 11 Fault (Reverse Bridge)
8 SCR 12 Fault SCR 12 Fault (Reverse Bridge)
9 SCR 13 Fault SCR 13 Fault (Reverse Bridge)
10 SCR 14 Fault SCR 14 Fault (Reverse Bridge)
11 SCR 15 Fault SCR 15 Fault (Reverse Bridge)
12 SCR 16 Fault SCR 16 Fault (Reverse Bridge)