Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 96)

Troubleshooting
Chapter 7
7Ć12
TripĆcondition Message (highest priority)
Trip-condition messages occur anytime the PM module detects a fault
condition that casts doubt on the system’s ability to:
measure the press’s shaft angle
control power to the solenoid valve triacs
When it detects this type of fault, the PM module immediately:
stops press motion
opens the seal relays
If it detects that the seal relays did not open, it
blows the main power fuses with crowbar relays
The trip-condition fault remains until you correct the problem and press
the RESET LATCHED MSG pushbutton wired to chassis C. Typical fault
conditions are due to system configuration, feedback signals, run stations,
or triacs. After corrrecting the fault condition, get back into operation
with the same steps as 0D Latched Message, above.
Example: If the motion detection input (Figure 6.2) should turn ON
while the press is operating, and you did not configure for motion
detection, the PM module would generate the following message:
Error BB (Hex)
Motion detector signal present though motion detector feedback is
not configured.
Diagnostic diagnostic message codes are not queued. When the PM
module detects multiple latched or tripped message conditions, it sends the
highest priority message code to the processor so your ladder logic can
process it, and to pre-determined slots in its I/O chassis so output modules
can display it. When you correct the condition and press the MESSAGE
RESET button, the PM module sends the next highest priority message
code if an error condition still exists. A message code of higher priority
overrides a message code of lower priority. For error conditions of equal
priority, the PM module sends the message code corresponding to the first
detected condition.
MessageĆcode Priority