Allen-Bradley SMC-50 Quick Start Manual page 34

Chapter 3 Operation and Troubleshooting
Display Fault HIM or
Software
Fault Code
Line Fault with 1, 2, 3
Phase Indication
Shorted SCR with 4, 5, 6
Phase Indication
Open Gate with 7, 8, 9
Phase Indication
PTC Power Pole and 10 or 60
SCR Overtemp
Open Bypass 11, 12, 13
No Load Fault 14, 15, 16, 17
Voltage Unbalance 18 and/or 42
and/or Current
Imbalance
Overvoltage 19
Undervoltage 20
Overload 21
Underload 22
Jam 23
Stall 24
Phase Reversal 25
Network and x026, x027,
Comm's Loss x028
(See Table 16)
Internal 24V and 36, 37
System Faults
32
Table 15 - SMC-50 Controller Fault Codes
Enabled Possible Causes
Prestart • Missing supply phase
• Motor not connected properly
and
• Incoming 3-phase voltage instability
Running
• Shorted power module
All
Start or • Open gate circuitry
Stop • Loose gate lead
• Controller ventilation blocked
• Controller duty cycle exceeded
• Fan failure
• Ambient temperature limit exceeded
• Failed thermistor
Running • Control voltage is low
• Inoperable power module bypass
Prestart • Loss of load side power wiring with
Only phase indication (15=A, 17=C)
• Start command cycled unexpectedly
with motor rotating
Running • Supply unbalance is greater than the
user-programmed value
• The delay time is too short for the
application
• Supply voltage is greater than the user-
Running
programmed value
• The delay time is too short for the
application
Running • Supply voltage is less than the user-
programmed value
• The delay time is too short for the
application
• Motor overloaded
Running
• Overload parameters are not matched to
the motor
Running • Broken motor shaft, belts, tool bits, etc.
• Pump cavitation
• Incorrect user setting
Running • Motor current has exceeded the user-
programmed jam level
Running • Motor did not reach full speed by the end
of the programmed ramp time
• Incorrect user setting
Prestart • Incoming supply voltage is not the
only expected ABC sequence
All • DPI network loss
• Communication disconnect at the serial
port
• Low line condition
All
• Excessive load on internal 24V supply
Rockwell Automation Publication 150-QS003E-EN-P - April 2017
Possible Solutions
• Check for open line (blown fuse)
• Check for open load lead
• Verify power quality
• Check for shorted SCR, replace power module if necessary
• Perform resistance check; replace power module if necessary
• Check gate lead connections to the control module
• Check for proper ventilation
• Check application duty cycle
• Wait for motor to cool or provide external cooling
• Replace power module or control module as needed
• Replace fan
• Check control voltage power supply
• Check control module TB2...TB4 and TB5...TB7 for secureness
• Make sure that AUX1 or AUX2 are not set to external bypass
• Replace power module
• Check all load side power connections
• Check motor windings
• Check power system and correct if necessary, then correct the user-
programmed value
• Extend the delay time to match the application requirements
• Check power system and correct if necessary, otherwise correct the
user-programmed value
• Extend the delay time to match the application requirements
• Check power system and correct if necessary, otherwise correct the
user-programmed value
• Extend the delay time to match the application requirements
• Check motor overload condition
• Check values for overload class and motor FLC and verify current draw of
the motor
• Check pump system, machine drive components, and loading
• Check settings
• Repair or replace motor
• Correct source of jam or excessive loading and check programmed time
value
• Check pump system, machine drive components, and loading. Repair or
replace motor, if necessary.
• Check settings
• Check power wiring and correct if necessary
• Check communication adapters and verify connection to the SMC.
• Reconnect each DPI connected device
• Check the control power and verify it is within the specification; check
the connections and grounding to the SMC control terminals
• Replace the control module