SAMCO-e Series
Protection operation list
When the protection operation of the main unit and machine starts, an alarm is displayed on the LED panel and tripping is stopped.
After checking the protection operation contents for restarting, it is necessary to remove all causes of anomaly from the main unit, machine, and motor.
For the LED display contents, inspection items, and handling, refer to Alarm List.
| Name | Description | Display |
|---|---|---|
| Overcurrent limiting (Anti-breakdown) |
When a current that exceeds the current set with Cd043 flows, the frequency
curves are adjusted to limit the increase in current. Acceleration: After the output current reaches the set value during acceleration, the frequency increases at a slower rate for a while to accelerate the motor within the current limit, preventing breakdown from occurring. Constant power operation: When the output current reaches the set value due to an overload during constant power operation, the frequency is reduced to keep the output current below the setting. When the overload is removed, the frequency returns to its previous setting. When the energy regenerated during deceleration of the motor exceeds the dissipation capacity of the brake resistor, raising the inverter- DC link voltage, the drive frequency stops decreasing and actually increases as necessary to prevent an overvoltage trip. |
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| Overvoltage prevention | After the regenerated energy decreases, deceleration is continued at a slower rate. |  |
| Overcurrent shutdown | When a current exceeding the allowable current range of the inverter is input, the protection circuit activates and stops the inverter. |  |
| Overvoltage shutdown | When the inverter-DC link voltage exceeds the specified voltage due to excessive regenerated energy, a protection circuit is activated to stop the inverter. |  |
| Protection against undervoltage (momentary power failure) |
When the DC link voltage falls below the specified value due to an abnormal power supply voltage, the inverter stops operating. |  |
| Overload shutdown (motor electrothermal shutdown) |
Overloading and overheating of the motor during low-speed operation are detected by the electrothermal protector to stop the inverter. Different values can be specified to trip the electrothermal protector depending on the type, rated current, etc., of the motor. |  |
| Overload shutdown (inverter thermal shutdown) |
The inverter stops operating when a current greater than the current rating of the inverter flows for one second or longer. |  |
| Fin overheat protection |
Warning ( ) is issued at a temperature 10°C below the abnormal radiator fin temperature ( ) when the ambient temperature rises sharply of the cooling fan stops. If it continues to rise further and exceeds the abnormal radiator fin temperature, the protection function stops the motor drive. (The abnormal radiator fin temperature differs depending upon the output frequency and output current.)This function also stops the drive when the main switching device (power module) is overheating. This This function is released when the temperature decreases to more than 10°C below the abnormal radiator fin temperature |
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| Brake resistor protection overheating |
As the regenerative energy of the motor increases, and the allowable brake resistor value (%ED) is exceeded, the brake resistor becomes temporarily unusable due to overheating protection. By letting the brake resistor cool down, it becomes usable again. |  |
| Overload prevention alarm |
The inverter stops operating if the motor is unable to accelerate or decelerate because the motor load is excessive or the setting of Cd043 (output current limiting function) is too low. |  |
| External thermal protection | An external thermal protector can be attached to a motor. By inputting this signal to the ES control signal terminal, the inverter can be set to stop when the thermal protector is activated. |  |
| CPU abnormality | f excessive external electrical noise or other disturbances lead to a malfunction of the CPU, connection failure of an option board, or internal memory abnormality, the inverter stops operating. |  |
Alarm list
The inspection items and handling contents are displayed as the alarm contents displayed by the LED on the operation panel.
Refer to the following list to determine the cause of the anomaly, and during inspection, handling, and recovery.
| Alarm Display |
Alarm Description | Inspection Contents | Handling |
|---|---|---|---|
 *2 |
Memory anomaly | After switching off the power and extinguishing the CHARGE lamp, switch the power back on and check the alarm. | Failure or destruction is likely to have occurred, and repair is required. Contact the location of purchase. |
 *1 |
System anomaly | Is external noise large? Are the signal lines and power lines too close? |
Attach absorber and noise filter. Place signal lines further apart from power lines. |
 *1 |
System anomaly | ||
 *2 |
System anomaly | Did sudden capacitor discharge occur? After switching off the power and extinguishing the CHARGE lamp, switch the power back on and check the alarm. |
Recheck the changed code data. Recheck the changed code data. If the alarm does not clear even after reapplying power several times, initialize the function code with Cd099 = 1, and then reapply power. However, in this case, all the function data return to the factory setting data. |
 *2 |
System anomaly | Is external noise large? Are the signal lines and power lines too close? |
Attach absorber and noise filter. Place signal lines further apart from power lines. |
 *2 |
System anomaly | ||
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System anomaly | After switching off the power and extinguishing the CHARGE lamp, switch the power back on and check the alarm. | Failure or destruction is likely to have occurred, and repair is required. Contact the location of purchase. |
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Overload during acceleration prevention alarm | Current limit value: Is Cd043 too small? | Increase the setting value. Increase the acceleration/deceleration time. |
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Overload during regular operation prevention alarm | ||
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Overload during deceleration prevention alarm | ||
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External temperature | Has the motor overheated? | Reduce the load. |
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Radiator temperature anomaly | Is the fan stopped? Is the ambient temperature high? |
Check the fan operation. Increase the amount of ventilation. |
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Undervoltage during acceleration | Are the power supply voltage conditions adequate? Are the power supply voltage conditions adequate? Is input open phase? |
Improve or adjust the power supply conditions. |
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Undervoltage during regular operation | ||
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Undervoltage during regular operation | ||
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Main switching element temperature anomaly | Is the fan stopped? Is the fan stopped? |
Is the fan stopped? Increase the amount of ventilation. |
 *3 |
Overcurrent during acceleration | Does acceleration/deceleration occur suddenly? | Increase the acceleration/deceleration time. |
 *3 |
Overcurrent during regular operation | Overcurrent during regular operation Is the main switching element abnormal? |
Eliminate the short circuit or grounding. If the same alarm is displayed repeatedly, contact the location of purchase. |
 *3 |
Overcurrent during deceleration | ||
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Short-time overcurrent during acceleration |
Sudden acceleration? Current limit value: Is Cd043 too large? |
Sudden acceleration? Current limit value: Is Cd043 too large? |
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Short-time overcurrent during regular operation |
Sudden change (increase) in load? Current limit value: Is Cd043 too large? |
Sudden change (increase) in load? Current limit value: Is Cd043 too large? |
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Short-time overcurrent during deceleration |
Sudden deceleration due to large GD2? Current limit value: Is Cd043 too large? |
Sudden deceleration due to large GD2? Current limit value: Is Cd043 too large? |
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Overload during acceleration | Is motor used with overload? Is electrothermal setting correct? Is load GD2 too large? |
Is motor used with overload? Is electrothermal setting correct? Is electrothermal setting correct? |
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Overload during regular operation | ||
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Overload during deceleration | ||
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Overvoltage during acceleration | Does start occur during free run? | Start after motor stops. |
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Overvoltage during regular operation | Is motor activated from other source? | Change to system that does not activate motor. Change to system that does not activate motor. |
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Overvoltage during deceleration | Does rapid deceleration occur? | Increase deceleration time. (Set deceleration time according to load GD2.) |
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Brake resistor protection overvoltage | Is braking frequency excessive? | Reduce braking frequency. Reduce braking frequency. |
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Output open-phase (No detection in case of ultra-low |
Is inverter's output cable open-phase? | Securely connect the output cable. |
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Detection of feedback signal disconnection during PID control operation with Cd071 = 3 |
Is feedback signal cable disconnected? Is feedback signal normal? Cd055 or Cd063: Is gain frequency normal? |
Securely connect feedback signal cable. Cd055 or Cd063: Correctly check gain frequency. |
- Perform settings again so that all the function data are returned to the factory setting data and use these settings.
- Perform settings again so that all the function data are returned to the factory setting data and use these settings.
- The main switch element is provided with a short-circuit protection function, but in the case of repeated short-circuits that occur with high frequency, device damage may occur due to element deterioration, so resume operation after completely eliminating the causes of stoppage and checking safety.
- Note:
- If for some reason or another the operation panel display goes out, switch off the inverter's power, check each wire, and after extinguishing the charge lamp, reapply power (when power supply was short-circuited by mistake, etc.).
