Alarms, Trips, and Troubleshooting

Alarms and Trips

This section lists the user notification codes that appear on the VFD's keypad display and provides information that can assist the user in the event of a fault. User Notification codes are displayed when a system function or condition is active (e.g., atn, db, and dbOn). These codes remain visible on the keypad for the duration of the activation.

If a user setting or VFD parameter is exceeded, or if a data transfer produces an unexpected result, this is referred to as a Fault.

Alarms

An alarm indicates that a fault is imminent if existing operating conditions continue unchanged. An alarm can be linked to an output terminal to notify the operator remotely, close a contact, or engage a brake. At a minimum, an alarm code will appear on the keypad display. Table 10 lists the 15 possible alarm codes that may be displayed during the operation of the Q7 VFD.

Trips

If the condition that triggered the alarm does not return to normal within a specified time, the VFD faults and a trip occurs. A trip is a safety feature that results from a fault. It disables the VFD system if a subsystem malfunctions or if any of the variables listed below exceed their normal range:

- Current
- Voltage
-  Speed
- Temperature
- Torque
- Load

Trips/Faults and Possible Causes

Speed Error:

- Occurs when the motor speed exceeds the commanded speed while using an encoder for speed control.
-  Incorrect encoder connection or setup information.
- Defective encoder.

Overtorque:

    The torque required by the load exceeds the settings of parameters F616 or F617 for a time longer than set by parameter F618.
    The VFD is not properly matched to the application.
    The load is obstructed.

Overvolt Accel (Overvoltage During Acceleration):

    The motor is operating while being restarted.

Overvolt Decel (Overvoltage During Deceleration):

    The deceleration time is too short.
    The DBR (Dynamic Braking Resistor) value is too high.
    A DBR is required (DBR setup needs to be completed).
    Stall protection is disabled.
    The 3-phase input voltage is out of specification.
    Input reactance is required.

Overvolt Run (Overvoltage During Constant Speed):

    Load fluctuations.
    The 3-phase input voltage is out of specification.

Positional Error:

    While operating in Position Control mode, the resulting position exceeds the limits set by the Position Control settings.

RAM Error:

    Internal RAM malfunction.

ROM Error:

    Internal ROM malfunction.

Sink/Source Error:

    The Sink/Source jumper on the control board or an option device is improperly positioned.
    The Sink/Source configuration of an option device is incorrect.

+ Toshiba Q7 User Manual >>

+ Toshiba Q7 Fault index >>

+ Toshiba Q7 Fault codes 2 >>

+ Toshiba Q7 Fault codes 3 >>

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