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