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Alarms, Trips, and Troubleshooting
W7B ASD Installation & Operation Manual
*
Reset ignored if active.
*
OLI
ASD
Overload
Load requirement in
excess of the capability of
the ASD.
• Carrier frequency is too high.
• An excessive load.
• Acceleration time is too short.
• DC damping rate is set too high.
• Motor starting into a spinning load after a
momentary power failure.
• ASD is improperly matched to the application.
OLM
Motor
Overload
Load requirement in
excess of the capability of
the motor.
• V/f parameter improperly set.
• Motor is locked.
• Continuous operation at low speed.
• The load is in excess of what the motor can
deliver.
*
OP
Over-Voltage
DC bus voltage exceeds
specifications.
• ASD attempting to start into a spinning motor
after a momentary power loss.
• Incoming 3-phase power is above the
specified range.
• Decel time is too short.
• Voltage spikes at the 3-phase input; install
inductive filter.
• Over-Voltage Stall feature is turned off.
• System is regenerating.
• Load instability.
• Disable the Ridethrough function (
.
OT
Over-Torque
Torque requirement in
excess of the setting of
parameter
for a time longer than the
setting of parameter
• ASD is not correctly matched to the
application.
• Parameter
or
setting is too low.
• Obstructed load.
*
POFF
Control
Under-Voltage
Under-voltage condition at
the 5, 15, or the 24 VDC
supply.
• Defective control board.
• Excessive load on power supply.
• Low input voltage.
PtSt
Reference
Point
Two speed-reference
frequency setpoint values
are too close to each
other.
• Two speed reference frequency setpoints are
too close to each other (increase the
difference).
Table 10. (Continued) ASD Alarms.
EOI
Display
Function
Description
Possible Causes
Summary of Contents for W7 DN-57442-006
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