Rockwell Automation SA3100 AC Power Modules - Manual (Page 48)

4-2 SA3100 Power Modules
The following equipment should be available before initiating any troubleshooting
procedures:
• Digital Multimeter (DMM) capable of 1000V DC/750 VAC, with one megohm
minimum input impedance.
• Clamp on Ammeter (AC/DC) with current ratings to 2X rated current output of
SA3100 AC Power Module.
• Dual trace oscilloscope with differential capability, digital storage, two X10 and two
X100 calibrated probes (for safe high voltage differential measurement).
• Hand-held tachometer used to monitor motor shaft speeds.
Note that for maintenance and setup procedures, the Power Module may be operated
without a motor connected.
4.2 System Diagnostics
Operation of the Power Module is monitored by the PMI Regulator. 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.
Refer to instruction manual S-3056, Drive Configuration and Programming, for further
details on using the Drive Fault and Drive Warning registers.
4.3 Power Module Faults (UDC Register 202/1202)
The following faults indicate a problem with the Power Module hardware or related
components. If the PMI Regulator detects any of these faults, it will disable the gates
of the power devices, and the motor will begin to coast to rest. The PMI Regulator will
turn off the MCR output when it detects that motor current is less than 2% of the rated
motor current, or within 300 msec of the occurrence of a fault even if this current level
has not been reached.
Most faults are signaled by an LED indicator on the PMI Regulator. The bits in the
Drive Fault register (202/1202) should be examined to determine the cause of the
fault. If a fault occurs the identifying bit will set. The fault will also be recorded in the
error log for the UDC task in which it occurred.