Rockwell Automation SD3100 DISTRIB PWR SYS SD3100 DC PWR MODULE - Manual (Page 44)

4-2 SD3100 Power Modules
The Power Module may be checked with an ohmmeter for continuity and grounds. Do
not test the Power Module or associated circuitry with a megohmmeter (megger).
Disconnect all leads to the motor if the motor is to be ground-checked with a megger.
Failure to follow proper procedure when using a megger may cause damage to the
Power Module.
4.2 System Diagnostics
Operation of the Power Module is monitored by the PMI Processor. Fault and warning
registers (202/1202 and 203/1203) in the UDC must be used when the system detects
a fault or a warning.
The fault conditions reported in the Drive Fault register result in turning off the drive.
The UDC task is not stopped automatically when a drive fault occurs unless it is
specifically instructed to do so in an application task. The user must ensure that the
AutoMax application task tests register 202/1202 and takes appropriate action if a
fault occurs.
The warnings indicated by the Drive Warning register cause no action by themselves.
Any resulting action is determined by the application task. The user must ensure that
the AutoMax application task monitors register 203/1203 and takes appropriate action
if any of these conditions occurs.
The user should refer to instruction manual S-3006 (SD3000 Drive Configuration and
Programming) for further details on the Drive Fault and Drive Warning registers.
4.2.1 Power Module Faults
The following Power Module faults will cause the drive to shut down by commanding
zero current and stopping the firing of the SCRs. Most faults are signaled by an LED
indicator on the PMI Processor module. The bits in the Drive Fault register (202/1202)
should be examined to determine the cause of the fault. When a fault occurs the
identifying bit will be set. The fault will also be recorded in the error log for the UDC
task in which it occurred.
4.2.1.1 Shorted SCR Fault (Bit 0)
LED indicator: PM FLT
UDC Error Code: 1000
The PMI Processor will not be permitted to enter the run mode if a shorted SCR is
detected. Check register 204/1204 to identify the SCR that has shorted. Refer to
Instruction Manual S-3006.
4.2.1.2 AC Line Synchronization Fault (Bit 3)
LED indicator: EXT FLT
UDC Error Code: 1003
AC line voltage is missing for more than 2 seconds. The system will immediately go
idle when this fault is detected. NOTE: A temporary loss of AC line voltage will set bit 3
in Drive Warning Register 202/1202.