FIGURE B.1
Peak Current Fold-Back
Continuous Current Limit
1
11
Peak Current Limit
t(s)
Drive Current
Output
Amps
0
Sustained maximum current demand, when switching between positive
and negative maximum current without allowing sufficient time for fold-
back, will result in drive damage. Drive RMS current should be below the
continuous current setting!
MNALAZIN-02
43
/ Fault Conditions and Symptoms
within a time frame of less than 10 seconds. An over‐current condition will not cause the drive
to become disabled.
Motor Problems
A motor run‐away condition is when the motor spins rapidly with no control from the
command input. The most likely cause of this error comes from having the feedback element
connected for positive feedback. This can be solved by changing the order that the feedback
element lines are connected to the drive, or for AZBH and AZBE drives, changing Switch 4 on
the DIP switch bank to the opposite setting. See the drive datasheet for more information on
DIP switch settings.
Another common motor issue is when the motor spins faster in one direction than in the other.
This is typically caused by improper commutation, usually because the motor power wires are
connected in the wrong order. Try all six combinations of connecting the motor power wires to
the drive to find the correct commutation order. The proper combination of motor wires will
yield smooth motion and identical speeds in both directions. Improper combinations will
cause jerky motion, slow movement in one direction, and/or audible noise. As a final
verification that the commutation is correct, use the Velocity Monitor Output pin to measure
motor speed in both directions (see
“Velocity Monitor Output” on page 33
for more
information). This can also be caused by invalid Hall Commutation. Check to see if the drive is
set for 120‐ or 60‐degree phasing, and whether this setting corresponds to the type of motor
being used (typically 120‐degree for three phase motors, and 60‐degree for single phase
motors). See
“Hall Sensors” on page 8
for more information.
Causes of Erratic Operation
•
Improper grounding (for example, drive signal ground is not connected to source signal
ground).
•
Noisy command signal. Check for system ground loops.
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