Set L4-07 = 0 [Speed Agree Detection Selection = No Detection during Baseblock] to open and close the holding brake. When L4-07 = 1 [Detection Always Enabled], the output frequency increases when you input the Run command although the external baseblock command is input. Because of this, speed detection operates and will open the brake signal. Set Related Parameters Table 1 shows examples of parameter settings to use the MFDO terminal (M1-M2) as the holding brake open and close signal. Table 1. Holding Brake Open and Close Signal Setting Example Brake Open and Close Signal Brake Open and Close Level Adjust Applicable Control Methods (A1-02 Setting Value) Signal Name Parameter Settings Signal Name Parameter Settings V/f (0) OLV (2) CLV (3) AOLV (4) CLV/PM (7)1 Frequency (FOUT) Detection 2 L4-07 = 0 Speed Agree Detection Level L4-01 = 1.0 Hz to 3.0 Hz2 x x - x - H2-01 = 5 Speed Agree Detection Width L4-02 = 0.0 Hz to 0.5 Hz3 During Frequency Output H2-01 = 37 DC Injection/Zero Speed Threshold b2-01 = 0.1 Hz to 0.5 Hz - - x - x Figure 1. Frequency Detection 2 1 When A1-02 = 7 [PM Closed Loop Vector], make sure that the motor can rotate before you do Auto-Tuning or switch the encoder. Refer to Closed Loop Vector Control for induction motors for information about the signal to use and the adjustment method. 2 When A1-02 = 2 [Open Loop Vector], it is the usual setting range. When A1-02 = 0 [V/f Control], set L4-01 to the rated slip frequency of the motor + approximately 0.5 Hz. If you set the value too low, motor torque will not be sufficient and it will cause motor rollback. Set the parameters to meet these conditions at the same time. If the setting is too high, overshoot is possible at start. L4-01 > E1-09 [Minimum Output Frequency] L4-01 > L4-02 [Speed Agree Detection Width] 3 Use L4-02 to adjust the detection width of Frequency Detection 2. If rollback occurs when the motor is stopped, set the frequency to approximately 0.1 Hz.