MNALAZIN-02
42
/ Fault Conditions and Symptoms
Under-Voltage Shutdown
Verify power supply voltages for minimum conditions per
specifications. Also note that the drive will pull the power supply voltage down if the power
supply cannot provide the required current for the drive. This could occur when high current
is demanded and the power supply is pulled below the minimum operating voltage required
by the drive.
Short Circuit Fault
1.
Check each motor lead for shorts with respect to motor housing and power ground. If the
motor is shorted it will not rotate freely when no power is applied while it is uncoupled
from the load.
2.
Disconnect the motor leads to see if the drive will enable without the motor connected.
3.
Measure motor armature resistance between motor leads with the drive disconnected.
Invalid Hall Sensor State (Brushless Drives only)
See the “Commutation Sequence”
table in
“Hall Sensors” on page 8
for valid commutation states. If the drive is disabled check the
following:
1.
Make sure that the 60 or 120 degree phasing jumper (JE2) is in the correct setting per
motor data sheets. When driving a single phase (brushed type) motor with a three phase
(brushless) drive use the 60‐degree phase setting (see
“Using a Single Phase Motor with a
Three Phase Drive” on page 9
for more information on this particular configuration).
2.
Check the voltage levels for all the Hall sensor inputs.
3.
Make sure all Hall Sensor lines are connected properly.
Inhibit Input
Check inhibit input for correct polarity (that is, pull‐to‐ground to inhibit or pull‐to‐
ground to enable). Inhibit configuration depends on JE1 on the PCB. Also, keep in mind that
noise on the inhibit line could be a cause for a false inhibit signal being given to the drive.
Power-On Reset
All drives have a power‐on reset function to ensure that all circuitry on the
board is functional prior to enabling the drive. The board will only be disabled momentarily,
and will quickly enable upon power up.
Overload
Verify that the minimum inductance requirement is met. If the inductance is too low it could
appear like a short circuit to the drive and thus it might cause the short circuit fault to trip.
Excessive heating of the drive and motor is also characteristic of the minimum inductance
requirement not being met. See drive data sheets for minimum inductance requirements.
Over-Current
All drives incorporate a “fold‐back” circuit for protection against over‐current. This “fold‐back”
circuit uses an approximate “I
2
t” algorithm to protect the drive. All drives can run at peak
current for a maximum of 1 second (each direction). Currents below this peak current but
above the continuous current can be sustained during a time period of approximately (peak
current/current) 2 seconds. If such a current is commanded for a longer time period, the drive
will automatically fold back at an approximate rate of "I
2
t" to the continuous current limit,
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