ACS 400 User’s Manual79Group 20: LimitsCode Description2003 MAX CURRENTMaximum output current.The maximum output current that the ACS 400 will supply to the motor.2005 OVERVOLT CTRLDC overvoltage controller enable.Fast braking of a high inertia load causes the DC bus voltage to rise to the overvoltage control limit. Toprevent the DC voltage from exceeding the limit, the overvoltage controller automatically decreases thebraking torque by increasing output frequency.Caution! If a braking chopper and a braking resistor are connected to the ACS 400, this parameter valuemust be set to 0 to ensure proper operation of the chopper.0 = DISABLE1 = ENABLE2006 UNDERVOLT CTRLDC undervoltage controller enable.If the DC bus voltage drops due to loss of input power, the undervoltage controller will decrease the motorspeed in order to keep the DC bus voltage above the lower limit. By decreasing the output frequency, theinertia of the load will cause regeneration back into the ACS 400, thus keeping the DC bus charged, andpreventing an undervoltage trip. This will increase power loss ride-through on systems with a high inertia,such as a centrifuge or fan.0 = DISABLE1 = ENABLE ( TIME )Enable with 500 ms time limit for operation.2 = ENABLEEnable without time limit for operation.2007 MINIMUM FREQOperating range minimum output frequency.Note! Keep MINIMUM FREQ ≤ MAXIMUM FREQ .2008 MAXIMUM FREQOperating range maximum output frequency.
