Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 740)

Section 15A
Troubleshooting The Control
15A-30
Faults
Axis Module
Description
PWR The axis module hardware has faulted from an over current condition. The
current through the power output transistors is monitored. If the current
exceeds a fixed level (greater than 300% of controller rating) this fault will
appear. Typical causes are a shorted lead, motor malfunction, or
malfunctioning power IGBTs.
CRNT One of the axis modules of your 1394 drive has been requested to provide
too much current. This is typically caused by: Accel/Decel command from the
CNC is requiring peak current for an excessive amount of time, the machine
friction or inertial/viscous load is excessive, the motor has been improperly
sized, a short circuit exists across the drive output terminals, logic supply
circuits have malfunctioned, or AC input is incorrectly wired.
VBUS The DC bus supply was lost to the axis module. Check slider
connections/termination strip or there could be a blown link fuse.
TEMP 1 The 1394 contains a thermal sensor which senses the internal ambient
temperature. Causes could be: that the cabinet ambient temperature is
above rating. The machine duty cycle requires an RMS current exceeding
the continuous rating of the controller. The airflow access to the 1394 is
limited or blocked.
Faults
System Module
Description
VHI The 1394 system module bus voltage exceeds the maximum operating
voltage. The DC power bus is continuously monitored. If it exceeds a preset
level (810 Vdc), a fault is sensed and the power supply is disabled. This can
be caused by an under sized shunt requirement, shunt regulator fuse has
blown, the shunt regulator transistor has malfunctioned, the power driver
board is malfunctioning and incorrectly sensing the bus voltage, the CNC
acc/dec rate is incorrectly set, the input line voltage is excessive, the system
inertia is too high causing excessive energy to be returned to the power
supply bus, or a vertical axis with insufficient counterbalancing is overdriving
the servomotor and causing excessive energy to be returned to the power
supply bus.
VLOW The 1394 system module voltage does not meet the minimum operating
voltage. The DC power buss shall activate the under voltage limit when the
bus drops to 275 VDC or less. It will clear at 300 Vdc. Typical causes
include low voltage on the three phase input.
GRND The 1394 system module has detected a ground fault. The system
generates a ground fault when there is an imbalance in the DC bus of greater
than 5A. This drive error can be caused by incorrect wiring (verify motor and
ground wiring), motor malfunction, or an axis module IGBT malfunction.
TEMP 1 The 1394 contains a thermal sensor which senses the internal ambient
temperature. Causes could be: that the cabinet ambient temperature is
above rating. The machine duty cycle requires an RMS current exceeding
the continuous rating of the controller. The airflow access to the 1394 is
limited or blocked.
PHASE The 1394 system module has detected a loss of one of the input power
phases. The three--phase input line is monitored and a fault will be issued
when a phase loss is detected. Typical causes include, one or more input
line fuses have opened, contactor malfunction, or incorrect wiring.
1 Over Temperature Indicators are for the system module and axis modules only. They do not
reflect any motor over temperatures that may occur. Motor thermal switches (if available) should
be wired into the E-STOP string.