Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 152)

152 Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 12 Troubleshooting the PowerFlex Safety Option Module
Nonrecoverable Faults In addition to the recoverable faults described in this chapter, the safety option
also generates nonrecoverable faults when an anomaly with the safety option
hardware is detected. These faults are Safe State faults. If a Safe State fault occurs,
all safety control outputs are set to their safe state.
To clear a nonrecoverable fault, cycle power. If the nonrecoverable fault persists,
the safety option may need to be replaced.
Fault Recovery If the fault is no longer present, you can clear the fault condition with a successful
SS Reset and drive fault Clear command, except in the case of an Invalid
Configuration fault, MP Out fault, or Reset PwrUp fault. An Invalid
Configuration fault is cleared by a successful reconfiguration. An MP Out fault
or Reset PwrUp fault is cleared at power down or by a successful reconfiguration.
Input and Output Faults An input or output fault indication can be caused by several wiring fault
conditions during commissioning or normal operation. If an input fault occurs,
check for the following:
• One of the channels may have shorted to a 24V DC source.
• One of the channels may have shorted to a GND source.
• Two input channels have shorted together.
• One or both output channels have an overcurrent condition.
An input fault may also occur if only one of the channels in a dual-channel system
changed state after a 3-second discrepancy time interval, and if the inputs are
configured with one of these settings:
• 2 = Dual-channel equivalent 3 s (2NC 3s)
• 4 = Dual-channel complementary 3 s (1NC + 1NO 3s)
• 5 = Dual-channel SS equivalent 3 s (2 OSSD 3s)
Fault Codes and Descriptions Faults fall into one of three categories: Stop Category fault, Fault While Stopping
fault, and Safe State fault. Stop Category faults can be Motion faults, Monitor
faults, or I/O faults.
The HIM module or configuration software can display a fault history queue,
which provides a record of the faults detected by the safety option. The fault
history queue stores the fault codes and timestamps for the last 10 faults that
occurred. To avoid confusion about when faults occurred, a power-up marker
(code 32) is placed between faults in the queue if the safety option is powered up
or reset when the queue is not empty. Code 0 equals No Entry.