Altivar 16 AC Drive Configuration and adjustment of parameters with options Automatic deceleration ramp adaptation Function Automatic adaptation of deceleration ramp time if initial setting was too low taking into account the load inertia. This function prevents the possibility of tripping due to an overbraking fault . Applications All applications not requiring a controlled stop on the deceleration ramp. Adjustment N 1 2 brA: yes or no, preset to yes. 1 Initial adjustment 2 Automatic adjustment t Automatic adaptation must be overridden in the case of a machine with stop positioning following the ramp.
Motor thermal overload protection Function Indirect protection of the motor by continuously calculating I 2 t. This function insures motor thermal protection in the following cases: - Ambient motor temperature 40 ° C - Prolonged running between 25/30 Hz and 50/60 Hz with a self-ventilated motor. Adjustments 10 mn t ItH : 0.5 to 1.05 times the continuous drive output current, preset to 0.9. 1 mn Adjust to the motor nameplate full load current. 1 1.1 1.3 1.5 I/In To override thermal protection, increase value to the maximum. Switching frequency Function A high switching frequency allows the drive to supply the motor with a current waveform with low harmonics.
The switching frequency is modulated to reduce noise generated by the motor. Value: 5 kHz with ± 1 kHz modulation. Applications Applications: Pumps, fans, or constant torque applications requiring a low level of motor noise at low speed. 80 dBA With option VW3A16104 , switching frequency can be set to 10 kHz with a modulation of ± 1 kHz. 60 3 40 With the variable torque card, VW3A16202 , switching frequency is fixed at 10 kHz. 20 0 0 10 20 30 40 50 f (Hz) Curves above generated with a 3 hp (2.2 kW), 4-pole motor 1 Switching at 5 kHz 2 Switching at 10 kHz 3 Motor connected directly to input supply 18 1 2