1. What is the maximum pulse frequency input for ASDA-B2 and ASDA-B3?

There are two pulse input modes for ASDA-B2 and ASDA-B3: Line Driver and Open Collector. The table below shows the maximum pulse frequency inputs for ASDA-B2 and ASDA-B3.

2. How do I set the signals of the servo drive if I’d like to use a servo motor with brake?

The brake signal controls the solenoid valve, provides power to the brake, and enables the brake. Please refer to the operation below to set the DO functions and wiring.

1. Digital output (DO) setting: Set the DO code to 0x08 (BRKR). When the signal of electromagnetic brake control is output, refer to the setting of parameters P1-42 and P1-43.

2. Refer to the wiring diagram below to use an electromagnetic brake.

Notes: (1) The brake coil has no polarity. (2) Do not use brake power and control power (VDD) at the same time.

3. How does regenerative resistor affect the servo drive?

A regenerative resistor is used to discharge the regenerative power returned from the motor to the servo drive which is generated when the servo motor runs and stops a load with a large amount of inertia frequently. This regenerative power is transmitted into the capacitance of DC bus, resulting in the rise of voltage. When the voltage rises to a certain high level, the servo drive will need to dissipate the extra energy by using a regenerative resistor. In general, when the capacity of the regenerative power is small, there is no need to install a regenerative resistor. Use the regenerative resistor when: 1.A regeneration error (ALE05) is detected on the servo drive during the operation. 2.The DC bus voltage exceeds 370V or the output torque of the servo motor exceeds 100% constantly.

4. In Position Control mode, how many types of external pulse inputs?

There are three types of external pulse inputs, including PULSE+SIGN, CW+CCW, and AB phase pulse? 1) Pulse + Direction: operation speed is determined by the frequency of the first pulse command. Second pulse input will decide Forward or Reverse command, high voltage for forward and low voltage for reverse. 2) CW+CCW: operation speed is determined by the frequency of the pulse command. Forward command is decided by the first command input and reverse command is by second command input. 3) AB phase pulse (encoder): operation speed is determined by the frequency of pulse command x1, x2, or x4. When first pulse command leads before the second one, the command will be forward. When second pulse command leads before the first one, the command will be reverse

5. When do you need to use a regenerative resistor?

When a fault, ALE05 (Regeneration Error) is detected on the servo drive, it indicates that regenerative power has returned from the load to the servo drive and it exceeds the processing capacity of the servo drive. This power will be transmitted into the capacitance of the DC Bus and result in rising voltage. When the voltage rises too high, the servo system needs to dissipate the extra energy by using a regenerative resistor. The ASDA-A2 series servo drive provides a built-in regenerative resistor which is equipped as standard. Users can also connect an external regenerative resistor if more regenerative capacity is needed. The following table shows the specifications of the servo drive's built-in regenerative resistor and the amount of regenerative power (average value) that it can process. ASDA-A2 220V Series

ASDA-A2 400V Series

Please pay close attention to the following notes when using a regenerative resistor. 1.Make sure the settings of resistance (parameter P1-52) and capacity (parameter P1-53) are set correctly. 2.When installing an external regenerative resistor, make sure that its resistance value is the same as the resistance of the built-in regenerative resistor. If combining multiple small-capacity regenerative resistors in parallel to increase the regenerative resistor capacity, make sure that the resistance value of the regenerative resistor complies with the specifications listed in the table above. 3.In general, when the amount of regenerative power (average value) that can be processed is used at or below the rated load ratio, the resistance temperature will increase to 120°C or higher (when regeneration occurs continuously). For safety reasons, forced air cooling is a good way to reduce the temperature of the regenerative resistors. We also recommend using regenerative resistors with thermal switches. As for the load characteristics of the regenerative resistors, please check with the manufacturer. 4.When using an external regenerative resistor, connect it to P and C, and make sure the circuit between P and D is open. We recommend using external regenerative resistors with resistance values that follow the table above (Specifications of Built-in Regenerative Resistors).