Alarms

Table 11 lists the alarm codes that may be displayed during operation of the W7 ASD. Each alarm code listed is accompanied by a description and a possible cause. In the event that the source of the malfunction cannot be determined, contact your Toshiba Sales Representative for further information on the condition and for an appropriate course of action.

The active Alarm is displayed on the Frequency Command screen. Multiple active alarms are displayed one at a time and are scrolled at one-second intervals.

Table 11. W7 ASD Alarms.

EOI

Function

Description

 

Possible Causes

Display

 

 

 

 

 

 

 

 

 

 

CM1

Comm1 Error

Internal communications error.

Improperly programmed ASD.

 

 

 

Improper communications settings.

CM2

Comm2 Error

External communications error.

Improperly connected cables.

 

 

 

 

 

 

 

 

EMG

Emergency Off

Output signal from the ASD is

StopReset pressed twice at the EOI.

 

 

terminated and a brake may be

• EOFF command received remotely.

 

 

applied if so configured.

 

 

 

 

 

 

 

ASD reset required.

 

 

 

 

 

MOFF

Main

Undervoltage condition at the

Low 3-phase utility voltage.

 

Undervoltage

3-phase AC input to the ASD.

 

 

 

 

 

 

 

OC

Over Current

ASD output current greater than

Defective IGBT (U, V, or W).

 

 

the parameter 0601 setting.

• ASD output to the motor is connected incorrectly.

 

 

 

 

 

 

 

Disconnect the motor and retry.

 

 

 

• ASD output phase-to-phase short.

 

 

 

• The ASD is starting into a spinning motor.

 

 

 

Motor/machine jammed.

 

 

 

• Mechanical brake engaged while the ASD is starting or

 

 

 

 

while running.

 

 

 

• Accel/Decel time is too short.

 

 

 

• Voltage Boost setting is too high.

 

 

 

Load fluctuations.

 

 

 

• ASD operating at an elevated temperature.

 

 

 

 

 

*OH

Overheat

ASD ambient temperature

ASD is operating at an elevated temperature.

 

 

excessive.

• ASD is too close to heat-generating equipment.

 

 

 

 

 

 

• Cooling fan vent is obstructed (see Mounting the ASD

 

 

 

 

on pg. 18).

 

 

 

• Cooling fan is inoperative.

 

 

 

• Internal thermistor is disconnected.

 

 

 

 

 

OJ

Timer

Run-time counter exceeded.

Type Reset required; select Clear run timer.

 

 

 

 

 

* Reset ignored if active.

 

 

 

 

 

 

 

 

W7 ASD Installation and Operation Manual

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Image 153
Toshiba W7 manual Alarms, Type Reset required select Clear run timer