SAMCO-vm05 Series (SHF/SPF, SBT)
Protection Functions
| Protection Function | Description | Display |
|---|---|---|
| Overcurrent limiting (Anti-breakdown) | When the current exceeds the set value, 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 and the frequency curves are slowed 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. |
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| Overvoltage prevention | When the energy regenerated during deceleration of the motor exceeds the dissipation capacity of the brake resistor, raising the DC voltage of the inverter, the drive frequency stops decreasing and actually increases as necessary to prevent an over-voltage trip. After the regenerated energy decreases, deceleration is continued at a slower rate by slowing the frequency curves. |
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| 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 from the motor, a protection circuit is activated to stop the inverter. |  |
| Protection against undervoltage (momentary power failure) |
When the DC voltage falls below the specified value due to an abnormal power supply voltage, the inverter stops operating. |  |
| Overload 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 | The inverter stops operating when a current greater than the current rating of the inverter flows for one second or longer. |  |
| Fin overheat protection | A warning (tH) is issued at a temperature 10 | |
| Brake resistor overheating protection |
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. Letting the brake resistor cool down allows it to become 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 the overcurrent limiting value is too low. |  |
| External thermal operation | An external thermal protector can be attached to a motor. By inputting this signal to the multifunctional terminal for which ES (external stop command) is assigned, the inverter can be set to stop when the thermal protector is activated. |  |
| CPU abnormality | The inverter will stop operating if excessive external electrical noise or some other disturbance leads to a malfunction of the CPU, connection failure of an option board, or internal memory/data abnormality. |  |
