174 G7 ASD Operation Manual
Alarms

Table 1 0 lists the alarm codes that may be displayed during operation of the G7 ASD. Each alarm code

listed is accompanied by a description and a possible cause. In the event th at the s ource of th e malfunct ion

cannot be determined, contact your Toshiba Sales Representative for further information on the condition

and for an appropriate course of action.

The Alarms are listed in the top-down order that they are checked for activation. Only th e first to be

detected will be displayed on the Frequency Command screen.

Tabl e 10 . G7 Alarms.

EOI

Display Function Description Possible Causes

CM1 Comm1 Error Internal communications error. • Improperly programmed ASD.
• Improper communications settings.
• Improperly connected cables.
CM2 Comm2 Error External communications error.
EMG Emergency Off Output signal from the ASD is
terminated and a brake may be
applied if so configured.
• Stop|Reset pressed twice at the EOI.
• EOFF command received remotely.
• ASD reset required.
MOFF Main
Undervoltage Undervoltage condition at the
3-phase AC input to the ASD. • Low 3-phase utility voltage.
OC Over Current ASD output current greater than
F601 setting. • Defective IGBT (U, V, or W).
• 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
excessive. • ASD is operating at an elevated temperature.
• 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 R ese t required; select Clear run timer.
* Reset ignored if acti ve.