DC Brushless Motor
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DC Brushless Motor Series

Q: How are the Alarm out / Speed out contacts of the brushless motor applied?
A: Alarm out and Speed out are both output signals, so they need external DC voltage. The voltage value should be below DC26V, must be serially limited current resistance so that the current is within 10mA with the external DC voltage value standard (H standard) under normal conditions or 0V standard (L standard) in motion.
Q: If we want to control with PLC, how are the wires on the input/output contacts on the drive connected with the PLC?
A: For the input signal, the output contact (Y) of the PLC is connected to the input contact (RUN/STOP/CW...) on the driver and the COM of the PLC end is connected to the -COM point on the driver; for the output signal, it needs external DC supply, and the input contact (X) of the PLC is connected to the output contact (S.O/A.O) on the driver, and the PLC COM is connected to the -COM point on the driver.
Q: How do we set up the multi-segment speed control of brushless motors?
A: 1) Use multiple variable resistors paired with control switch
2) Use PLC with D/A module controlled through the program
3) Do contact control with TROY's D/A speed seter and PLC
4) Use TROY Communication Brushless Motor Series to have 8 segments of speed control.
Q: How can we select the variable resistance specification when the brushless motor is parallel running?
A: The main variable resistance specification is 20KΩ 1/4W and the fine-tuned variable resistance specification is 50KΩ 1/4W. No more than 20 drivers in parallel operation.
Q: Under what circumstances do we need to install a regenerative resistor?
A:1) When running under the roll, the brushless motor output shaft will be driven by gravity more or less, at which the rotor magnet will become a generator to cause the motor to generate a reverse voltage back to the driver, which is called the regenerative voltage.
2) When it is beyond the motor inertial load tolerance, the motor stops, and the motor shaft driven by the inertial inertia of the load swing will also produce a regenerative voltage.
When the regenerative voltage occurred, we need to use regenerative resistor to absorb the regenerative voltage to avoid damage to the driver. The 200W model of our company have regenerative resistor for accessories but the regenerative resistor will be only optional accessories for models equal to or below 120W.