BENSHAW M2L 3000, User Manual

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M2L 3000 Series VFD
96
Table 22: Fault Conditions
Fault
Code
Fault Displayed
Reaction
Type
Description Course of Action
27
Output phase loss
fault
C
Occurs when the drive is running and
the calculated phase current imbalance
exceeds the level set in the
Output
Phase Loss Level parameter
(FUNCTION-28), for the time specified
by the
Output Phase Loss Trip Time
parameter (FUNCTION-29).
This condition could be caused by:

current imbalances that occur at the
beginning of a ramp

a loose or open power wiring con-
nection

a damaged motor
Set the
Output Phase Loss Enable
(FUNCTION-27) parameter to Disabled, and
observed the three phase currents on the
Meter Trending screen while the motor is
starting. If the currents are only imbalanced
at the beginning of the ramp, extend the
Output Phase Loss Trip Time (FUNCTION-
29) parameter, and set the Output Phase
Loss Enable (FUNCTION-27) parameter
back to Enabled.
Check power wiring connections between the
inverter and the motor.
Megger test the motor.
28
Input phase loss
fault
C
Occurs when the drive is running and
detects the loss of an input phase, or a
blown fuse or damaged rectifier diode in
the rectifier section.
This condition could be caused by:

loss of one input phase from the
power source (blown supply fuse,
loss of phase from the utility source

a loose or open power wiring con-
nection to the primary windings of
the input

a blown fuse in the rectifier section

a damaged rectifier diode

an oscillating load on the motor re-
sulting in a 120Hz DC bus voltage
ripple.
31 Overcurrent fault D
Occurs when the motor current exceeds
the
Overcurrent Level (FUNCTION-22),
for a time exceeding the Overcurrent
Trip Time (FUNCTION-23).
Verify that the motor and load are not
inhibited in any way from rotating. Possible
conditions include worn bearings or moving
parts.
32 Undercurrent fault D
Occurs when the motor current drops
below the
Undercurrent Level
(FUNCTION-25) for a time exceeding
the
Undercurrent Trip Time
(FUNCTION-26).
Verify that the attached machinery has not
become decoupled or unexpectedly
unloaded.
It is also possible that the motor current
could have dropped out if the drive was not
supplying enough voltage. In this case, the
motor would either stop spinning, or spin
slowly before the fault occurs. Verify that the
Motor Rated Voltage (DRIVE-02) parameter
matches the motor nameplate.
50
Speed control
fault
C
Occurs when the drive is running and
the drive output frequency deviates
above the set reference speed by
greater than a predetermined amount.
Also occurs when the drive attempts to
decelerate, but a regeneration condition
prevents the drive from completing its
deceleration profile. Verify that the attached load has not become
decoupled or become unexpectedly
unloaded.
If the fault occurs during deceleration, verify
that there is not a continuous regeneration
condition present that is back-driving the
motor.