Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 159
Troubleshooting Chapter 9
Undervoltage 20 Running
• Power line grid voltage is less than the
programmed value
• Abnormal voltage regulation
• The parameter settings and or delay time
programmed are not suited for the
application
• Check the power system and correct if necessary. NOTE: If the
power source is a backup generator, check the stability of the
generator voltage regulator. Replace if necessary.
• Modify the parameter and/or extend the delay time to match the
application requirements.
• Disable this fault/alarm feature.
Overload 21 Running
• Motor overloaded
• Overload parameters are not matched to the
motor
• Check motor overload condition.
• Check programmed values for overload class and motor FLC;
verify current draw of the motor.
• Disable this fault/alarm feature.
(3)
Underload 22 Running
• Broken motor shaft, belt, grating, etc.
•Pump cavitation
• Programmed setting incorrect for application
• Check machine drive components and loading.
• Check pump system.
• Repair or replace motor.
• Check programmed settings.
• Disable this fault/alarm feature.
Jam 23 Running
• Motor current has exceeded the user
programmed jam level for the programmed
time
• Correct source of jam or excessive loading.
• Check programmed time value.
• Disable this fault/alarm feature.
Stall 24 Running
• The motor did not reach full speed by the end
of the programmed ramp time
• Incorrect programmed setting
• Check pump system, machine drive components, and loading;
repair or replace motor, if necessary.
• Check programmed settings.
• Disable this fault/alarm feature.
Phase Reversal 25 Prestart Only
• The controller is not detecting incoming
supply voltage in the expected ABC sequence
• Check power wiring and correct, if necessary.
• Disable this fault/alarm feature.
Exp Removed x026
(2)
In All Modes
• Expansion module is loose or removed
• Expansion module is defective
• Reseat or replace the expansion module connector to the control
module and tighten module screws.
• Replace defective module.
Exp Incompat x027
(2)
In All Modes
• Expansion module is inserted into an
incompatible control module port number
• Controller firmware is not compatible with
the expansion module
• Expansion module is defective
• Insert the expansion module into a compatible control module
port.
• Update the control module firmware
• Replace defective module.
Expansion x028
(2)
In All Modes
• Expansion module is loose or removed
• Expansion module is defective
• Expansion module is inserted into an
incompatible control module port number
• Controller firmware is not compatible with
the expansion module
• Reseat and/or replace loose/removed module and tighten
module screws.
• Replace defective expansion module.
• Update control module firmware.
Starts per Hour 29 Starting
• The number of starts within the last hour has
exceeded the programmed value
• Programmed setting is incorrect for the
application
• Wait for the hour to expire, then restart the motor.
• Reduce the actual number of starts per hour or increase the
programmed start time (if allowed by the application) and
controller thermal limits.
• Turn off this fault/alarm feature.
CT Loss: A, B, or C 30, 31, or 32 In All Modes
• Loose CT cable connection between the power
section and the control module
• Phase A (F30), B (F31), or C (F32) current
transformer feedback circuit has failed
• Option Module 150-SM2 with external CT
operation (Fault Code 7030, 8030)
• Remove the control module from the power section; verify
connectors TB2 (A), TB3 (B), and TB4 (C) are firmly seated to the
control module.
• Replace the control module and/or the power section.
• Inspect the CT sensor cables for loose connections; check CTs for
damage; repair/replace CTs if necessary; replace 150-SM2 option
module if necessary.
Hall ID 33 In All Modes
• Loose cables between the controller and
power section.
• Incompatible power section installed with the
controller
• Remove the control module from the power section; verify
connectors TB2 (A), TB3 (B), and TB4 (C) are firmly seated to the
control module.
• Check the power section and replace, if necessary.
NVS Error 34 In All Modes
• Controller memory corrupted
•Option module error (Fault Code 7034, 8034,
or 9034)
• Modify a parameter or load parameter defaults (preferred) and
reload the customer-specific parameters.
• Check the option module sensor cables.
• Replace the option module.
Future Use 35 NA NA NA
V24 Loss 36 In All Modes
• Loose connection at Control Terminals 1 (+L1)
and 2 (-L2)
• Excessive load on internal 24V supply
• Low line voltage condition
• Check the control power and verify it is within the specification;
check the line connections and grounding to the SMC-50
controller control terminals.
• Replace the control module.
Table 58 - Fault Display Explanation (Continued)
Display Fault Code Fault Enabled Possible Causes Possible Solutions
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