Toshiba W7 - Manual (Page 154)

148 W7 ASD Installation and Operation Manual
*OLI ASD Overload Load requirement in excess of
the capability of the ASD. • 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.
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.
*OLR Resistor
Overload Excessive current at the
Dynamic Braking Resistor. • Deceleration time is too short.
• DBR configuration improperly set.
*OP Overvoltage DC bus voltage exceeds
specifications. • 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 ( 0302 ).
OT Overtorque Torque requirement in excess of
the setting of parameter
0616 or
0617 for a time longer than the
setting of parameter 0618 .
• ASD is not correctly matched to the application.
• Parameter 0616 or 0617 setting is too low.
• Obstructed load.
*POFF Control
Undervoltage Undervoltage 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).
UC Undercurrent Output current of the ASD is
below the level defined at
parameter
0611 and remains
there for the time set at
parameter
0612 .
* Reset ignored if active.
EOI
Display
Function Description Possible Causes