Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 130)

Troubleshooting
Chapter 11
11-126
Table 11.F (Continued)
Problems that Occur while the Drive is Operating
Possible Solutions Probable Cause Problem
Bus Undervolt
displayed - DC bus
voltage less than
the minimum
allowable level was
detected. Adjust taps on transformer or add step-up transformer to keep AC
line voltage above 180V AC, 50/60 Hz. Incoming 3 phase voltage is out of
tolerance.
Increase kVA rating of supply transformer to proper rating for drive
size (especially if fault occurs during accel or when the motor is
running under heavy load), see Table 8.C. Incoming AC line impedance is
too high.
With drive operating in motoring or accel (if possible), check phase
to phase line voltages for balanced conditions and verify that voltage
is above 180V AC. Check all incoming line connections for
tightness. An incoming 3 phase line is open,
or has high impedance.
AC Phase Loss
displayed - Loss of
one phase of
incoming AC line
detected by drive. Refer to fault condition 4 Refer to fault condition 4.
With drive operating in motoring or accel (if possible), check phase
to phase line voltages for balanced conditions. Check all incoming
line connections for tightness. If a three-phase motor is connected to
the AC line, a lost phase may not be detected by a voltage test on a
lightly loaded 8510 system. An incoming 3 phase line is open,
or has high impedance.
Increase kVA rating of supply transformer to proper rating for drive
size. (Especially if fault occurs during accel or when the motor is
running under heavy load.) See Table 8.C. Incoming AC line impedance is
too high.
Check IGBT modules M4, M5, and M6 (or IGBT2 in A04/A06
drive) according to procedure later in this chapter. Replace Power
Unit if IGBT is malfunctioning. Malfunctioning IGBT module in
converter bridge.
Replace the Main Control Board (Gate Drive Board and possibly
CPU Board on A04/A06). Malfunctioning printed circuit
board.
If problems were not found with other tests, replace the Power Unit. Malfunctioning Power Unit.
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