VLT ® 2000 Series Description of parameters I 204 Digital reference type (DIG. REF. TYPE) Value: ✭ Sum (SUM) [0] Relative (RELATIVE) [1] Description: By means of terminal 29 you can switch between the other references (terminal 29 = 0 V) and the sum of the other/digital references (terminal 29 = 24 V). You must select Digital reference select in parameter 402 and 403 to select one of the digital references: Function: The digital references are generated internally in the unit and presented as a percentage of the difference between the f MAX and f MIN selected in parameters 201 and 202, added to f MIN .
18/27 19 Terminal 0 0 Digital reference 1 1 0 Digital reference 2 0 1 Digital reference 3 1 1 Digital reference 4 Description: If Sum is selected, one of the digital references (parameters 205-208) is added as a percentage of the difference between f MAX and f MIN with the other references. If Relative is selected, one of the digital references (parameters 205-208) is added as a percentage of the sum of the other references. I 209 Current limit (CURRENT LIMIT) Value: 0.3 - I VLT,MAX Function: Using this parameter you can set the maximum allow- able output current of the VLT frequency converter.
If the current limit is exceeded the output frequency is reduced until the current falls to the current limit. The output frequency does not increase to the set refe- rence value until the current has fallen to below the current limit. I 205 Digital reference 1 (DIG. REF. 1) Value: − 100.00% - +100.00% ✭ 0 I 206 Digital reference 2 (DIG. REF. 2) Value: − 100.00% - +100.00% ✭ 0 Description: The factory setting corresponds to a load which is 160% (VLT 2030 1/3 x 208-240 V:140%) of the rated output current. If you want to use the current limit as motor protection you must record the rated motor current.
Using parameter 310 you can record how long you want the frequency converter to operate at current li- mit before tripping out. I 207 Digital reference 3 (DIG. REF. 3) Value: − 100.00% - +100.00% ✭ 0 208 Digital reference 4 (DIG. REF. 4) Value: − 100.00% - +100.00% ✭ 0 I The load range of 100-160% is only for intermittent operation and therefore the unit can only give an output of 160% ((VLT 2030 1/3 x 208-240 V: 140%) for 60 seconds. Operation time is extended at decreasing load and is unlimited at 100%. Function: The digital speed references are generated internally in the unit and presented as a percentage of the f MAX value.
The percentage value is added to any analogue reference from terminals 53 and 60. If the switching frequency is higher than 4.5 kHz this period will be shorter. ✭ = Factory setting. Text in ( ) = Display text. The figures in [ ] are used in bus communication. 68 MG.20.B6.02 – VLT is a registered Danfoss trademark