VLT ® 2000 Series Description of parameters I 105 Motor frequency (MOTOR FREQ) Value: ✭ 50 Hz (50 Hz) [0] 60 Hz (60 Hz) [1] 87 Hz (87 Hz) [2] 100 Hz (100 Hz) [3] I 109 Start voltage (START VOLTAGE) Value: (automatically set) 0 - (U M,N + 10%) Function: By increasing the start voltage you can achieve higher starting torque. Small motors ( require high start voltage. On parallel coupling of mo- tors, only the start voltage can be used to increase the starting torque. Function: Using this parameter you can select the frequency equivalent to the motor’s rated frequency. Description: You can choose among 4 different frequency values.
The value is selected on the basis of the data on the type plate of the motor. The U/f ratio in parameter 111 is changed automatically. Description: Do not forget to consider that the motor must be able to start with the required torque: 1. Choose a value to make start possible with the load in question. 2. Reduce value until start with the load in question is just possible. 3. Choose a value where operation in the rest of the frequency range is possible at the lowest possible current consumption. If the start voltage makes normal operation impossible, you can change the U/f ratio in parameter 111. I 107 Motor current (MOTOR CURRENT) Value: I MAG (par.108) - I VLT,MAX( PAR . 209) Function:
The motor’s rated current is included in the VLT frequency converter’s calculation of e.g. torque, thermal motor protection and cut-out level. Warning: If the use of start voltage is over- done it can lead to magnetic saturation and motor overheating and the frequency converter may trip out. Therefore take care when using the start voltage parameter. Description: You must record the rated motor current (Amp). The value will appear from the motor plate. I 108 Motor magnetising current (MOTOR MAG.AMP) Value:(automatically set) 0.3 - I M,N (par.107) Function: The VLT frequency converter uses the value for different calculations such as compensation. Description:
If the factory setting is unsuitable the motor current on running idle should be measured with a suitable amperemeter (RMS). The magnetising current is then set to the measured value. ✭ = Factory setting. Text in ( ) = Display text. The figures in [ ] are used in bus communication. 64 MG.20.B6.02 – VLT is a registered Danfoss trademark