Bonfiglioli ACTION 401/201 Inverter Engineering Integration Guide

Auxiliary tools: VPlus oscilloscope and diagnostics

VPlus oscilloscope function: It needs to be used in conjunction with KP232 interface (115 kbps, not supported by CM-232). It can display 4 waveform curves (current, voltage, speed, torque, internal status bit, etc.) simultaneously, with a sampling interval of 2ms~32ms, a sampling depth of 1MB, and a maximum storage record of 60 minutes.

Parameter copying: The KP500 control unit has built-in non-volatile memory, which can copy the complete set of parameters of a frequency converter to other devices of the same model, greatly accelerating the progress of batch debugging.

Reference for troubleshooting typical engineering faults

Phenomenon 1: No display when the frequency converter is powered on

Check if the input power supply voltage is within the allowable range (ACT401: 320~528V AC).

Check if the DC bus terminal is short circuited or if the external braking resistor is grounded.

Check if the built-in EMI filter triggers protection due to ground fault.

Phenomenon 2: Overcurrent (OC) reported during motor start-up

Check the insulation and phase to phase resistance of the motor cable (eliminate short circuits).

Confirm whether the motor parameters match the actual conditions (rated current, power factor).

Attempt to extend the acceleration ramp time (P120) or reduce the initial acceleration torque.

For overloaded applications, confirm that the correct control mode has been selected (such as FOC configuration with sensor 210).

Phenomenon 3: Profibus communication failure

Check if the GSD file version matches the PPO type setting.

Confirm if the terminal resistor dip switch of the CM-PDP module is located at the physical end of the bus.

Check if the node address configured by the main station is consistent with the frequency converter parameter P707.

Phenomenon 4: Overheating of braking resistor or poor braking effect

Check if the brake transistor is conducting normally (parameter P500).

Confirm whether the resistance value of the braking resistor meets the recommended value in the manual to avoid overcurrent caused by too small a resistance value.

Check if the DC bus voltage has reached the brake activation threshold (approximately 390V DC for 230V system, 780V DC for 400V system).