LED

LCD

Description

 

Possible Causes

Display

Display

 

 

 

 

 

 

 

 

 

*OP

Overvoltage

 

ASD attempting to start into a spinning motor after a

 

 

DC bus voltage exceeds

 

momentary power loss.

 

 

specifications.

• Incoming commercial 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).

 

 

 

 

 

OT

Overtorque

Torque requirement is in excess

ASD is not correctly matched to the application.

 

 

of the setting of F616 or F617

F616 or F617 setting is too low.

 

 

for a time longer than the setting

 

 

 

 

 

 

of F618.

Obstructed load.

 

 

 

 

 

*POFF

Control

 

Defective Control board.

 

Undervoltage

Undervoltage condition at the 5,

• Excessive load on power supply.

 

 

15, or the 24 VDC 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

With the Low-current Trip

this function sets the low-current trip threshold

 

 

(F610) parameter enabled, the

 

 

 

 

output current of the ASD is

 

 

 

 

below the level defined at F611

 

 

 

 

and remains there for a time

 

 

 

 

longer than the setting of F612.

 

 

 

 

 

 

 

* Reset ignored if active.

 

 

 

 

 

 

 

 

H9 ASD Installation and Operation Manual

249

Page 257
Image 257
Toshiba H9 operation manual PtSt, With the Low-current Trip