C
HAPTER
5 - T
ROUBLESHOOTING
BDS
5-6
Table 5.2. BDS4 Status LED Indicator Troubleshooting
SYMPTOM
PROBABLE CAUSE
1) Control Volts LED
(Green) Not Illuminated
(a) Control AC line input voltage out of spec or had a momentary
interruption.
(b) Unregulated logic bus not applied to BDS4 from PSR4/5 due to
defective wiring or being miswired (fuses inside of PSR4/5 may be
blown).
(c) Defective logic bus supply in BDS4 or PSR4/5 or blown logic bus
fuse.
(d) Defective BDS4.
2) Enable LED (a) Enable input circuit not pulled low.
(Green) Not Illuminated (b) Defective BDS4.
3) Drive Ready LED (a) BDS4 faulted (see Red LED's).
(Green) Not Illuminated (b) BDS4-COMP Compensation Board not installed or misinstalled.
(c) Reset input activated (active low).
(d) Defective BDS4.
4) Foldback LED
(RED) Illuminated
(a) BDS4 in resolver alignment test mode (refer to Section 4.4.3.3).
(b) Excessive RMS current causing BDS4 I
2
t protection circuit to
activate. Reduce motor duty cycle.
5) Overtemp LED (RED) (a) Excessive heatsink temperature due to overload or high ambient
temperature.
(b) Defective BDS4.
6) Overcurrent LED
(RED) Illuminated
(a) When this LED becomes illuminated, an overcurrent condition
[usually due to a shorted load (motor stator winding), shorted stator
wiring, or a shorted BDS4 power stage component] is indicated. If this
LED becomes illuminated, remove the power and disconnect the
motor. Reapply power. If the BDS4 comes up without this LED
becoming illuminated, suspect a faulty motor or motor stator wiring. If
the BDS4 comes up with the LED illuminated, suspect a faulty BDS4
power stage.
7) Overvolts LED (RED) (a) This LED will become illuminated if the Main DC Bus rises
above 230 VDC for 115 VAC system, 430 VDC for the 230 VAC
system. This can happen due to PSR4/5 fault or inadequately sized
shunt regulator regeneration resistor.
8) Undervolts LED (RED) (a) This LED will become illuminated if the Main DC Bus is
insufficient or absent.
9) Overspeed LED (RED) (a) In the event the motor obtains an excessive speed, the
OVERSPEED fault circuit will activate, latch the BDS4 in the inhibit
mode, and this LED will become illuminated.
(b) Miswired or intermittent resolver cable.
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