Rockwell Automation 1771-QB Linear Pos. - Manual (Page 165)

Troubleshooting
Chapter 11
11Ć3
Table 11.A
Troubleshooting Indicators
Indication Description Probable Cause Recommended Action
Fault
Loop 1
Loop 2
Normal Condition Module is fully functional.
Fault
Loop 1
Loop 2
PowerĆUp State A) Powerup complete, awaiting initial
parameter block.
B) Module not receiving DC power from
the chassis backplane or wiring arm
terminals.
A) Send parameter block, monitor status
block for parameter block errors.
B) Check all power supplies, make sure
the module is properly seated in the I/O
chassis, monitor status block for analog,
feedback, or discrete faults.
Fault
Loop 1
Loop 2
Loop 1 Fault A) Analog Interface Fault
B) Discrete Input Fault
C) Transducer Interface Fault
A) Check status block to determine cause
of fault.
Fault
Loop 1
Loop 2
Loop 2 Fault D) Excess Following Error
E) Excess PID Error
F) Loss of Feedback
B) Correct fault and issue a reset command
to the faulted axes or cycle the I/O
chassis power OFF, then ON.
Fault
Loop 1
Loop 2
Both Loops Faulted G) Hardware Stop Input
H) Immediate Stop Command
Fault
Loop 1
Loop 2
Module Fault Internal Circuitry Fault Cycle power to the I/O chassis containing
the module. Return the module for repair if
the FAULT LED remains lit when you restore
power.
Fault
Loop 1
Loop 2
Loop 1 Inactive
Loop 2 Active
Module hasn't received or accepted Loop 1
parameter block.
A) Send Loop 1 parameters.
B) Check status block for Loop 1 parameter
block errors.
Legend: ON OFF Blinking ON or OFF
If you are experiencing feedback faults, perform the following loopback test to
determine whether the problem is in the module, the transducer, or the cabling
between the module and the transducer:
1. Turn off axis power.
2. Disconnect the transducer from the +GATE (1/2), +INTERR (5/6), -GATE
(3/4), and -INTERR (7/8) terminals on the module’s wiring arm.
3. Connect the +GATE terminal (1/2) to the +INTERR terminal (5/6).
Troubleshooting Feedback
Faults