Toshiba G7 Operation Manual page 181

EOI
Function
Display
*OLI ASD Overload
OLM Motor Overload
*OLR Resistor
Overload
*OP Overvoltage
OT Overtorque
*POFF Control
Undervoltage
PtSt Reference Point
UC Undercurrent
* Reset ignored if active.
G7 ASD Operation Manual
Description
Load requirement in excess of
the capability of the ASD.
Load requirement in excess of
the capability of the motor.
Excessive current at the
Dynamic Braking Resistor.
DC bus voltage exceeds
specifications.
Torque requirement in excess of
the setting of F616 or F617
time longer than the setting of
F618.
Undervoltage condition at the 5,
15, or the 24 VDC supply.
Two speed-reference frequency
setpoint values are too close to
each other.
Output current of the ASD is
below the level defined at F611
and remains there for the time
set at F612.
Possible Causes
• The carrier frequency is too high.
• An excessive load.
• Acceleration time is too short.
• DC damping rate is set too high.
• The motor is starting into a spinning load after a
momentary power failure.
• The ASD is improperly matched to the application.
• V/f parameter improperly set.
• Motor is locked.
• Continuous operation at low speed.
• The load is in excess of what the motor can deliver.
• Deceleration time is too short.
• DBR configuration improperly set.
• ASD attempting to start into a spinning motor after a
momentary power loss.
• Incoming utility power is above the specified range.
• Decel time is too short.
• Voltage spikes at the 3-phase input; install inductive
filter.
• DBR required.
• DBR resistance value is too high.
• DBR function is turned off.
• Overvoltage Stall feature is turned off.
• System is regenerating.
• Load instability.
• Disable the Ridethrough function (F302).
• ASD is not correctly matched to the application.
for a
• F616 or F617 setting is too low.
• Obstructed load.
• Defective Control board.
• Excessive load on power supply.
• Low input voltage.
• Two speed reference frequency setpoints are too close to
each other (increase the difference).
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