7. Options7-67-4 Dynamic braking (DBR).The VAT2000 includes a dynamic braking feature in drives up to U2KN07K5S and U2KX07K5S . Forlarger drives the dynamic braking is achieved by using external modules7-4-1 Units U2KN07K5S and smaller, and U2KX07K5S and smallerThese drives include a dynamic braking feature and a DB resistor as standard. The DBR device, allowsoperation cycle of 10% ED as shown in Fig. 7-2.When using the dynamic braking option, set parameter B18-1, and C31-1, accordingly.Tt2t1S p e edFig. 7-2(1) Unit built-in DBRThe wiring of resistor built into the unit is shown in Fig. 7-3, and ratings are shown in table 7-3Because of space restrictions, these resistors do not allow 100% of braking torque in some cases.Table 7-3DevicetypeU2KNResistancecapacity(W)Resistancevalue(Ω)Brakingtorque(%) (1)Max.t1(SEC)00K4S 120 220 180 3000K7S 120 220 100 3001K5S 120 220 50 3002K2S 120 180 40 2004K0S 120 110 40 1005K5S 120 91 30 1007K5S 120 91 25 10(Note 1) The braking torque is given for constant torque ratings. When using variable torque ratings, thebraking torque is the value given for one frame smaller drive.DevicetypeU2KXResistancecapacity(W)Resistancevalue(Ω)Brakingtorque(%)Max.t1(SEC)00K4S 120 430 300 1000K7S 120 430 200 1001K5S 120 430 100 1002K2S 120 430 65 1004K0S 120 430 40 1005K5S 120 430 25 1007K5S 120 430 20 10T ≥10mint1 + t2+ ... ≤ 1min.
