EOI

Function

Description

 

Possible Causes

Display

 

 

 

 

 

 

 

 

 

 

*OLI

ASD Overload

Load requirement in excess of

The carrier frequency is too high.

 

 

the capability of the ASD.

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

V/f parameter improperly set.

 

 

the capability of the motor.

Motor is locked.

 

 

 

 

 

 

• Continuous operation at low speed.

 

 

 

• The load is in excess of what the motor can deliver.

 

 

 

 

 

*OLR

Resistor

Excessive current at the

Deceleration time is too short.

 

Overload

Dynamic Braking Resistor.

• DBR configuration improperly set.

 

 

 

 

 

 

 

 

*OP

Overvoltage

DC bus voltage exceeds

ASD attempting to start into a spinning motor after a

 

 

specifications.

 

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

ASD is not correctly matched to the application.

 

 

the setting of parameter 0616 or

• Parameter 0616 or 0617 setting is too low.

 

 

0617 for a time longer than the

 

 

 

 

 

 

setting of parameter 0618.

Obstructed load.

 

 

 

 

 

*POFF

Control

Undervoltage condition at the 5,

Defective Control board.

 

Undervoltage

15, or the 24 VDC supply.

• Excessive load on power supply.

 

 

 

 

 

 

Low input voltage.

 

 

 

 

 

PtSt

Reference Point

Two speed-reference frequency

Two speed reference frequency setpoints are too close to

 

 

setpoint values are too close to

 

each other (increase the difference).

 

 

each other.

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

148

W7 ASD Installation and Operation Manual

Page 154
Image 154
Toshiba W7 manual Dynamic Braking Resistor, PtSt