Operating Instruction - Frequency Inverter 230V / 400V ... - opis.cz

11.2.1 Switch-Off ThresholdThe Switch-off Threshold Stop Function 637 defines the frequency as from which astandstill of the drive is recognized. This percentage parameter value is applied to theset Maximum Frequency 419.The switch-off threshold is to be adjusted according to the load behavior of the driveand the device output, as the drive must be controlled to a speed below the switch-offthreshold.ParameterSettingsNo. Description Min. Max. Fact. sett.637 Switch-Off Threshold 0.0 % 100.0 % 1.0 %Attention! If the motor builds up a stopping torque, it may be possible that theswitch-off threshold stop function is not reached due to the slip frequencyand the standstill of the drive is not recognized. In this case,increase the value of the Switch-off Threshold Stop Function 637.11.2.2 Holding TimeThe Holding Time Stop Function 638 is considered in stopping behaviors 1, 3, 4 and6. Controlling to zero speed results in the motor heating up and should only be donefor a short period in the case of internally ventilated motors.ParameterSettingsNo. Description Min. Max. Fact. sett.638 Holding Time 0.0 s 200.0 s 1.0 s11.3 Direct current brakeStopping behaviors 3, 6, 7 and the search run function include the direct current brake.Depending on the setting of the stop function, a direct current is impressed into themotor either directly or, when it is at a standstill, after the demagnetization time. Theimpression of the Braking current 631 results in the motor heating up and should onlybe done for a short period in the case of internally ventilated motors.ParameterSettingsNo. Description Min. Max. Fact. sett.631 Braking Current 0.00 A √2⋅I FIN √2⋅I FINThe setting of the parameter Braking Time 632 defines the time-controlled stoppingbehavior. Contact-controlled operation of the direct current brake is activated by enteringthe value zero for the Braking Time 632.Time controlled:The direct current brake is controlled by the status of signals Start clockwise and Startanticlockwise. The current set by the parameter Braking Current 631 flows until thetime set by the parameter Braking Time 632 has expired. During the braking time thestatus of both signals Start clockwise and Start anticlockwise are logical 0 (low) orlogical 1 (high).88 02/06