Installation manual

Publication 1394-IN002B-EN-P — February 2004
Troubleshooting Status Indicators 4-5
Troubleshooting System
and Axis Module Faults
Fault messages are transmitted to the SERCOS controller through the
SERCOS ring and/or SCANport. The tables on the following pages
provide a description of system and axis module faults, the potential
cause, and possible resolutions.
Note: Fault messages are shown as seen in RSLogix software (bold)
and when using the HIM or DriveExplorer (not bold).
System Module Faults
Use the table below for troubleshooting system module faults.
Fault Message
RSLogix (HIM):
Description: Potential Cause is: Possible Resolution is:
DriveOvercurrent
Fault
(Bus Overcurrent)
System module exceeded
current rating.
Motor or transmission malfunction.
• Check for proper motor sizing.
• Check/replace transmission device.
• Check/replace motor.
System module not properly sized.
• Check for proper system module sizing.
• Install larger kW rated system module.
DriveOvervoltage
Fault
(Bus Overvoltage)
The DC bus voltage is above
limits. If it exceeds (830V
dc), a fault is sensed and
the power supply is
disabled.
Bus Voltage Operation
Shunt turns on at
805V dc.
Shunt turns off at
750V dc.
Over voltage trip point is
825V dc.
Under voltage trip point is
275V dc.
Under voltage fault clears
at 300V dc.
If this fault occurs when you power up the system
module with the M-contactor, the power
distribution impedance might be stiff or line
voltage might be too high.
• Perform line conditioning.
• Verify that line voltage is within
specifications.
The position controller acceleration / deceleration
rate is incorrectly set.
Change the command profile to reduce speed
or increase time.
The system inertia is too high causing excessive
energy to be returned to the power supply bus.
• Change the command profile to reduce
speed or increase time.
• Use a larger external shunt resistor.
A vertical axis with insufficient counterbalancing
is overdriving the servo motor and causing
excessive energy to be returned to the power
supply bus.
• Use the external shunt resistor.
• Increase the mechanical
counter-balance on the machine.
Input line voltage exceeds the maximum input
voltage rating.
Verify incoming main ac input voltage and
change the supply source, if needed.
Power Driver Board is malfunctioning and is
incorrectly sensing the bus voltage.
Replace the system module.
The shunt regulator or transistor has
malfunctioned.
Replace the system module.
External shunt regulator fuse has blown. Check and possibly replace the shunt resistor.
Shunt type not selected properly. Select proper shunt type.
DriveUndervoltage
Fault
(Bus Precharge)
The system module pre-
charge cycle has failed.
The precharge circuit has malfunctioned.
• Check main ac line voltage.
• Check fusing.
• Replace the system module.
DriveUndervoltage
Fault
(Bus Undervoltage)
The DC power bus activates
undervoltage limit when the
bus drops to 275V dc or
less. It will clear at 300V dc.
The voltage on the main ac input power is low.
• Verify incoming AC voltage and change
the supply source, if needed.
• Check fusing.
DriveHardFault
(Can Init)
SCANport hardware
initialization fault detected.
Control board hardware failure.
• Cycle all input power.
• If fault persists, replace system module.