Toshiba Q9 Fault index
Alarms, Faults, and Troubleshooting
What is an Alarm?
An alarm notifies the user when a system operating limit has been exceeded and action is needed to correct the condition. If not addressed, this can often lead to a fault (though not all alarms result in faults, such as a part replacement alarm).
User Notification Codes
These codes are used to alert users about active system functions (e.g., ETN, ETN2, Emergency Off, etc.).
What is a Fault?
A fault occurs when user settings or VFD (Variable Frequency Drive) operating requirements are exceeded, or if a data transfer function yields unexpected results.
Relationship Between Alarms and Faults
Some faults come with an alarm that warns the user when the system’s normal operating conditions are outside of specifications and a trip is imminent. If the condition triggering the alarm doesn’t return to normal within a specified time (some alarms are informational only and don’t result in a trip), the VFD will fault and stop.
What is a Trip?
A trip is a safety feature that occurs due to a fault, disabling the VFD system. This happens when a subsystem of the VFD malfunctions, or when one or more of the following variables exceed their normal range in time and/or magnitude:
Current
Voltage
Speed
Temperature
Torque
Load
Alarms and Trips
What is an Alarm?
An alarm indicates that system operating limits have been exceeded, or an operator error has occurred, suggesting that a fault may be imminent (not all alarms result in faults). Alarms can be associated with an output terminal to notify the operator remotely, close a contact, or engage a brake. At the very least, an alarm will display a code on the EOI screen.
Displaying Alarms:
Active alarms can be viewed on the Alarm screen—some alarms appear on the Frequency Command screen. If an alarm appears on the Frequency Command screen, press the Mode key to scroll to the Alarm screen.
Below is a list of possible alarm codes that may be displayed during the operation of the Q9 VFD. Each alarm code is accompanied by a description and a possible cause. If the source of the issue cannot be determined, contact your Toshiba Sales Representative for further information and guidance.
If multiple alarms are activated, only the first detected alarm will be displayed.
What is a Trip?
Trip
A trip is a safety response to a fault that stops the VFD output and prevents the system from executing a Run command when the VFD or its subsystem is malfunctioning. Trip and fault are sometimes used interchangeably. When a trip occurs, the system displays the active fault on the Fault screen.
Trip Conditions and Troubleshooting:
Operating conditions during a trip can help determine the cause. Here are some conditions to assist the operator in correcting the problem or discussing it with Toshiba’s Customer Support:
+ What trip information is displayed?
+ Is this a new installation?
+ Has the system ever worked properly, and what are the recent changes (if any)?
+ What is the VFD/Motor size?
+ What is the CPU version and revision level?
+ What is the EOI version?
+ Does the VFD trip during acceleration, running, deceleration, or when not running?
+ Does the VFD reach the commanded frequency?
+ Does the VFD trip without the motor attached?
+ Does it trip with an unloaded motor?
+ VFD Main page -
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