Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 752)

Section 15A
Troubleshooting The Control
15A-42
TEMPERATURE
1
System Module Over Temperature
The 1394 contains a thermal sensor which senses the internal ambient
temperature. Causes could be that : The cabinet ambient temperature is
above the 70 deg C 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. An axis module or a system module FAN has
failed.
PHASE LOSS system Module Phase Loss (0)
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, two or all three
of the input line fuses have opened, contactor malfunction, or incorrect wiring.
GROUND
FAULT
System Module Ground Fault (0)
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 50 A. This drive error can be caused by incorrect wiring (verify motor
and ground wiring), motor malfunction, or an axis module IGBT malfunction,
or a short to ground
SHUNT
TIMEOUT
**
System Module Shunt timeout (0)
The shunt resistor has timed out due to an amount of regeneration energy
produced by the motor exceeding the limit of the shunt resistor by more than
5%. You may require a properly sized shunt, modification of the duty cycle
of the application, or the addition of an external shunt for additional capacity.
OVER
CURRENT
**
System Module Current Limit (0)
The system module has reached the limit of its current capabilities. The total
motoring and regeneration current produced has exceeded the current
capability of the system module by 5% or more. You may need to reduce the
acc /dec profiles or increase the size of the system module.
PRE CHARGE
**
System Module Pre- Charge (0)
The DC bus voltage did not rise to operating levels (285 V) within .5 sec after
3 phase power was applied to the system. This can occur if : a short is
detected on the DC bus . An axis is enabled before the pre--charge check is
complete, or if torque is commanded before full bus voltage is present.
SHUNT UTIL
**
value
Shunt resistor utilization percentage. This is a display of the amount of heat
(current) that the shunt resistor has absorbed. A value approaching 100%
indicates that the shunt resistor is saturated and will not be able to sustain
further dynamic use.
REGEN UTIL
**
value
Regeneration unit utilization percentage. This is a display of the amount of
heat (current) dissipation that the regeneration electronics have absorbed. A
value approaching 100% indicates that the regen electronics are becoming
saturated and will not be able to sustain further dynamic use.
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.