SAMI G S Note! The SAMI GS incorporates a bus controller that prevents overcurrent and overvoltage trips caused by too fast acceleration and deceleration for a given system (by increasing the acceleration/ deceleration settings). The maximum (minimum) recommended acceleration (deceleration) for the nominal size motor is 40 Hz in 1 second. If the motor rating is less than the nominal power of the SAMI GS, smaller settings can be used. If the reference signal changes more slowly than the acceleration or deceleration time, the output frequency change will follow the reference signal.
If the reference signal changes faster than the acceleration or deceleration time, the output frequency change will be limited by the parameters. If a small number is entered for the acceleration time in a system with high inertia, the acceleration time will be limited by the OUTPUT CURRENT (parameter 22.3). Conversely, if a small number is entered for deceleration time in such a system, the deceleration time will be limited by the DC link bus regulator. In some cases, the motor will take a long time to come to a stop. If a short deceleration time is critical to your application, we suggest you add a dynamic braking device to your system.
6 Acceler Ref2 Time 7 Deceler Ref2 Time These times correspond to the time required for the reference to change from 0 to 100 % and vice versa. 9.2.2 Group 22 - Freq/Cur Limits These values can be altered with the SAMI GS running. *) Max value is set automatically according to the setting of parameter 22.4. 1 Minimum Frequency 2 Maximum Frequency Note! Current limitation time is not supervised. Excessive overcurrent may cause SAMI to stop the drive due to overtemperature. The MINIMUM FREQUENCY represents the minimum output frequency available. In a similar fashion, the MAXIMUM FREQUENCY is the maximum output frequency available (see para. 13.1 and 13.2). Note!
If a value greater than 1.5 is entered, the SAMI will automatically decrease the limit to 1.5 when the output frequency is higher than 0.74 ∗ FIELD WEAK POINT. 3 Output Current 4 Max. freq. Range This setting determines the max.output cur- rent the SAMI GS will supply to the motor. If the rated current of the motor is lower than the rated current of the SAMI GS, the current limit is recommended to be set in accordance with the motor rating in standard applications. This Parameter extends the setting range of parameter 22.1/22.2/13.1 to 13.4/23.2 to 23.11/24.1 to 24.7/28.7/28.9 to 28.14/31.2/ 31.4 and 31.8.
49 Parameter Range/Unit Description 1 Minimum Frequency 2 Maximum Frequency 3 Output Current 4 Max. Freq. Range 0...120/500 Hz *) 0...120/500 Hz *) 0.5...2.0*I [A ] N 0 - 120 Hz/0 - 500 Hz*) Minimum operating frequency (f ) min Maximum operating frequency (f ) max Output current limit Normal/Extended Range for ACS 501