VLT ® 2000 Series I I 110 Start compensation (START COMP.) Value: (automatically set) 0.00 - 99 V/A 112 Slip compensation (SLIP COMP) Value: (automatically set) 0.0 - 20Hz Description of parameters Function: Using this parameter you can make a load-dependent torque adaptation. This is for example used for mo- tors and applications where there is a large difference between the motor’s full-load current (parameter 107) and no-load current (parameter 108). Function: Slip compensation increases the output frequency and voltage of the VLT frequency converter with an increasing load to compensate for the motor’s increasing slip (loss). This achieves a load- independent speed. Description:
If the factory setting is not sufficient, you can set the parameter so that the motor can start at the actual load. You can also combine start compensation with parameter 109. Description: Choose a value so that the speed remains constant when the load increases. If the value is too high the speed increases with the load. This may lead to unstable motor operation. When you use synchronous motors and motors connected in parallel, set slip compensation to 0 Hz. Slip compensation should be avoided in case of high dynamics. Section 1 Section 2 Section 3 Warning: Should not be used with synchronous motors and parallel-coupled motors and where quick load changes may occur.
To avoid instability do not increase the value more than necessary. I 114 Feedback type (FEEDBACK TYPE) Value: Voltage (VOLTAGE 10 V) [0] ✭ Current (CURRENT 20 mA) [1] Pulses (PULSES) [2] I 111 U/f ratio (V/F. RATIO) Value: (automatically set) 0.00 - 20 V/Hz Function: Using this parameter you can change the linear ratio between voltage (U) and frequency (f) to ensure correct motor magnetisation, optimal dynamics, accuracy or efficiency, Function: Using this parameter you can choose the process feedback type when you use a PI controller (must be selected). See also the decription of parameter 101 and the section on the PI controller, page 53. Description:
Use the parameter only if you cannot record the correct motor data in parameters 104 and 105. The value can be calculated as follows: Description: When using the PI controller, you must use one of the inputs of terminal 29, 53 or 60 for the feedback sig- nal. Parameters 405, 412 and 413 must be set according to the feedback signal selected. Naturally these choices block the same type of reference sig- nal. U/f = Motor voltage (para. 104) Motor frequency (para. 105) The value of the factory setting is based on no-load operation. Therefore it is lower than the value calculated. The compensation will give the necessary voltage supplement. ✭ = Factory setting. Text in ( ) = Display text.
The figures in [ ] are used in bus communication. MG.20.B6.02 – VLT is a registered Danfoss trademark 65