CNCdrive DG4S Series, Manual

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9 CONTENTS
Error (and Stop) See Chapter 4.2 for features and function of the Error line.
See Chapter 5.4 for Error line connection options.
Note: A Stop signal can be sent on the Reset line or on the Error line. Ground-
ing either of these pins will stop the drive, but in different ways. See Chapter 4.2 for
Error line function.
3.3 Using external braking circuit
The background: When a DC motor is rapidly deccelerating it acts as a generator. The
generated energy pumps back into the drive, possibly higher the voltage in the motor
power supply. Therefore if the used power supply rated voltage is greater than 80VDC, it
is strongly recommended to use an external braking circuit which dumps and dissipates
the generated extra Voltage and energy.
Working of braking circuits: A braking circuit monitors the motor power supply voltage. If
the voltage level rises above a set level the braking circuit activates and powers a braking
resistor. The braking resistor is used to dissipate the generated extra energy.
We supply braking circuit products which fits our drives and can be used to protect the
drives and the system from regenerative overvoltage events. For more information please
check our BRKC-xxx braking circuit devices datasheet.
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