Rockwell Automation SMC-Flex User Manual page 122

9-4 Troubleshooting
Table 9.A SMC Fault Display Explanation (Continued)
Display
V24 Recovery
V24 Loss
V Control
Option Input 1, 2
Varies (control module
system faults)
Fault Code
F44 • Control module internal 24V control
power stays low after closing bypass
contactor
F45 • Control module internal 24V supply
out of normal range
F46 • Sense of control voltage in error
F48, F49 • Fault occurs based on the user
configuration of the option input
F128-F209 • Control module wiring
• Control module defective
Possible Causes
Prestart fault indication.
Table 9.B Motor Will Not Start — No Output Voltage to the Motor
Display
Fault displayed •
Display is blank •
•
Stopped •
0.0 Amps •
•
•
•
•
Starting •
Table 9.C Motor Rotates (but does not accelerate to full speed)
Display
Fault displayed •
Possible Solutions
• Check control power. Make sure it is within the
operating parameters of the SMC
• Check control power connections, including ground,
to the control module
• Replace control module
• Same as F44
• Same as F44
• Review the option input fault configuration and clear
the fault condition
• Review the control module wiring. Ensure ground
terminal is secure connected to system earth
ground. Ensure an RC snubber is connected to all
inductive loads in the control circuit (refer to input
wiring)
• Replace the control module
Possible Cause
See fault description •
Control voltage is •
absent
Failed control module •
•
Pilot devices •
SMC Enable input is •
open at terminal 13
Input terminals are not •
wired correctly
Start-Stop control has •
not been enabled for
the human interface
module
Control voltage •
Failed control module •
Two or three power •
phases are missing
Possible Cause
See fault description •
Possible Solutions
See Table 9.A addressing
fault conditions
Check control wiring and
correct if necessary
Replace control module
Cycle control power
Check wiring
Check wiring
Check wiring
Follow the instructions on
page 7-4...7-6 to enable
control capability
Check control voltage
Replace control module
Check power system
Possible Solutions
See Table 9.A addressing
fault conditions