Method of Resetting Trip Causes

If your inverter trips due to a malfunction or issue, ensure you remove the cause of the trip before attempting to reset it. Resetting the inverter without addressing the underlying issue will result in repeated trips.

Error Codes and Solutions

To reset the inverter from a trip state, follow these steps:

- Cut Off Power Supply: Turn off the power until the LED display goes blank.
+ Note: Refer to section 6.25.3 for details on the Inverter trip holding parameter F602.
- Use External Signal: Create a short-circuit between RES and CC on the control terminal board.
- Operate on the Panel: Use the panel controls to reset.
- Clear the Trip via Communication: Refer to the manual for communication for details on how to do this.

Resetting Procedure Using the Panel:

- Check the LED on the control panel to confirm if a trip has occurred. If it’s not visible, press the MONITOR key to display it.
- Press the STOP key and ensure the [L_r] message appears on the display.
- Press the STOP key again. If the cause of the trip is resolved, the inverter will reset.

Note on Overload Protection:

- Overload Protection (OL 1, OL 2, OL r): If the inverter trips due to overload protection, it will require a cooling period before it can be reset.
+ OL 1: Wait about 30 seconds after the trip.
+ OL 2: Wait about 120 seconds after the trip.
+ OL r: Wait about 20 seconds after the trip.

Note on Overheating (OH):

- If the inverter trips due to overheating, allow ample time for it to cool down completely before resetting. Overheating is detected based on internal temperature.

Caution:

For a quick reset from trip status, turn off the inverter and reset it. However, frequent resets can damage the motor and other components.

Troubleshooting Other Issues

Common Problems and Solutions:

- Motor Runs in Reverse:
+ Change the phase sequence of output terminals U, V, and W.
+ Swap the forward and reverse signal inputs of external operation signals. (Refer to section 7.2 on Control Terminal Function Allotment.)

- Motor Runs but Speed Cannot Be Varied:
+ Load Too Heavy: Reduce the load on the motor.
+ Soft Stall Function Activated: Turn off the soft stall function. (Refer to section 5.13.)
+ Low Frequency Settings: Increase the maximum frequency (F_H) and upper limit frequency (UL) settings.
+ Weak Frequency Signal: Check the input signal level, circuit, and connections.
+ Frequency Signal Setup: Verify frequency setting signal specifications (Refer to section 7.3).
+ Stall Prevention Function: Ensure it's not activated due to a high torque boost rate. Adjust manual torque boost (b) and acceleration time #1 (ACC). (Refer to sections 5.12 and 5.1.)



Troubleshooting Motor and System Issues

1. Motor Acceleration/Deceleration is Rough:

- Cause: Acceleration time #1 (ACC) and deceleration time #1 (dEC) are set too short.
- Solution: Increase the settings for both acceleration and deceleration times.

2. Large Motor Current:

- Cause: The motor is overloaded.
- Solution: Reduce the load on the motor and check if the torque boost rate is too high at low speeds (see section 5.12).

3. Motor Speed is Too High or Low:

- Causes and Solutions:
+ Improper Voltage Setting: Ensure the motor voltage is set correctly.
+ Low Terminal Voltage: Check and adjust the base frequency voltage #1 (F306). Replace the cable with a thicker one if necessary (see section 6.13.6).
+ Improper Gear Ratio: Adjust the gear ratio for smooth acceleration and deceleration.
+ Incorrect Output Frequency: Verify and adjust the output frequency range.
+ Basic Frequency Tuning: Tune the basic frequency (see section 5.9).

4. Motor Speed Varies During Operation:

- Causes and Solutions:
+ Load Fluctuation: Reduce load changes.
+ Incorrect Rating: Use a motor or inverter with a higher rating.
+ Frequency Signal Fluctuations: Check the frequency setting signal input for fluctuations.
+ V/f Control Parameter: If set at 3 or larger, verify vector control settings (see section 5.10).

Operation Panel Issues

1. Keys on the Operation Panel Don’t Work:

- Description and Solution:
+ Cause: The panel operation prohibition parameter F703 is set incorrectly.
+ Solution: Cancel the key operation prohibition mode by pressing the [↑] key twice while pressing the [ENT] key.
- If parameter F700 is set to "0" (prohibited), change it to "1" (allowed).
- If there is an input terminal set for "110" or "111" (enabling parameter editing), turn on the terminal.

Measures Against Parameter Setting Troubles:

- Checking Changed Parameters: Changed parameters can be searched and reset (see section 4.1.3).
- Resetting Parameters to Default: Reset all changed parameters to their default values (see section 4.1.5).

Inverter Trip Information

Before calling for service, troubleshoot using the table below. If the issue persists, contact the inverter dealer.

+ Toshiba VFD-A7 User manual >

+ VF-A7 Fault codes 1 >>

+ VF-A7 Fault codes 2 >>

+ VF-A7 Fault codes 3 >>

+ VF-A7 Fault codes 4 >>

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