Rockwell Automation 1756-DMF30 ControlLogix Drive Module - Manual (Page 246)

Publication 1756-UM522B-EN-P - February 2003
B-166 1756-DMD30 Specific Information
Parameter 2122 [MC Faults]
This parameter indicates the occurance of a motor-control fault.
These bits 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 Fault An SCR has shorted. Check Parameter 2124 [Pwr
DeviceStatus] to determine which SCR has shorted.
1 M Cont Lost Parameter 169 [Drive I/O Stauts] bit 1 [M-Cont Fdbk]
indicated the M-contactor has remained open when it
should have been closed.
3 AC Line Sync AC line voltage has been missing for more than 2 seconds.
Refer to parameter 2123 bit 3 [LineSyncLoss].
4 InstOvr Curr Armature current feedback has exceeded 175% of the value
in parameter 2184 [PMI Curr Lim].
5 Conduction TO The PMI Current Minor Loop has been turned off (parameter
2100 [Drive Ctrl Word] bit 0 [CMLoop Run] equals zero) and
discontinuous conduction has not been detected within 2
seconds.
6 Field Loss A field loss has been detected:
• Parameter 2132 [Fld Amps Fdbk] has been less than
parameter 2187 [FldLos Trip Pt] for more than 5 times
the electrical time constant of the field. This
assumes parameter 152 [Applied LogicCmd] bit 30
[Field En] is on.
• Parameter 2132 [Fld Amps Fdbk] has been less than
parameter 2187 [FldLos Trip Pt] for more than 30mS
after the field has been turned on. -
• Parameter 2132 [Fld Amps Fdbk] has been greater
than 150% of parameter 2185 [Hot Fld Cur] for more
than 30mS.
• Parameter 2132 [Fld Amps Fdbk] has been greater
than parameter 2207 [Fld PMI Rating] for more than
30mS.
7 Tach Loss CEMF is greater than 40% of the rated armature voltage
value and the speed feedback signal is less than 5% of the
motor base speed as entered as a configuration parameter.
8 TachWire Opn A sine or cosine signal being used for speed or other
application feedback is missing, due to one of the following
causes:
• a resolver wiring connection has broken
• The value in parameter 2161 [Resolver Gain] is too
low.
The Drive Module always performs this test if resolver
feedback is selected (parameter 222 [Motor Fdbk Sel] equals
“0 - Resolver”), and when parameter 168 [Drive I/O Ctrl] bit
10 [Dis Brkn Wire] equals one.