C
HAPTER
5 - T
ROUBLESHOOTING
BDS
5-2
A. External Interface (Circuitry external to, but
connecting to, the BDS4.)
B. BDS4 Amplifier Module
C. PSR4/5 Power Supply Module
1. Main DC bus voltage
2. Control DC bus voltages
3. Shunt Regulator Regeneration Circuitry
4. Soft-Start/Dynamic Bus Discharge
Circuitry
D. Motor
1. Resolver
2. Tachometer (Optional)
II. There are only two (2) basic fault characteristics
to be considered:
A. The motor exhibits very low torque or is
totally inoperative.
B. The motor is erratic or exhibits an improper
mode of operation.
5.3 SYMPTOMS AND CORRECTIONS
If the motor does not respond or responds in a
manner other than with smooth operation, remove
power and troubleshoot the system with the following
guidelines. Also refer to Table 5.1 for more improper
motor operation symptoms.
5.3.1 The Motor Exhibits Very Low
Torque or is Totally Inoperative
Prerequisites for motor movement:
1. The BDS4 and PSR4/5 must be wired
correctly, per BDS4 Wiring Diagram
(A-93231).
2. All power must be present.
3. The BDS4 must be in the Enable mode, as
indicated by the green CONTROL VOLTS,
ENABLE, and DRIVE READY LED's.
4. A command signal (other than zero volts) must
be present at the input of the BDS4.
5. Command Scale Adjustment should not be
fully CCW.
6. Fault circuits must not be activated. Fault
modes are identified by red LED's located on
the front of the BDS4 and PSR4/5 modules.
5.3.2 The Motor is Erratic or Exhibits
an Improper Mode of Operation.
Prerequisites for proper motor operation:
1. Proper grounding scheme must be provided.
The motor ground wire should be connected as
shown by BDS4 Wiring Diagram A-93231.
2. Motor armature leads must not be run in
conduit or wire ducts with any signal carrying
conductors.
3. The resolver leads, tach leads (when used), and
motor armature leads must be wired according
to BDS4 Wiring Diagram A-93231.
4. The motor system resolver must be set at its
zero point (refer to Section 4.4.3.3).
5. Stability Adjustment should not be fully CW.
6. The motor should be loaded with its specified
load inertias — see TL sheet for stable load
inertia range. Otherwise, the BDS4 may
become unstable.
5.3.3 BDS4-3, 6, 10, 20, 30, 40 and 55
AMP STATUS LED'S
The status of the BDS4 modules is indicated by three
(3) Green and six (6) Red LED's. Refer to Figure 5.1
for the LED configuration. The diagnostic
information indicated by these LED's is listed as
follows:
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