BECKHOFF DK9222-0610-0027 - Manual (Page 4)

I/O
Motion
Application Note DK9222-0610-0027
C Braking energy/energy recovery
The faster the deceleration time of the motors, the more negative energy is generated, which appears as a voltage peak at the
power supply unit.
See A Voltage peaks
Optimization potential with the Beckhoff buffer capacitor terminals
The EL9570 and KL9570 buffer capacitor terminals are intended for use with the output stages of stepper motors and DC
motors. With a capacitance of 500 µF they stabilize the power supply, feed energy back and protect highly dynamic drives
against overvoltage. The 12 mm wide EL9570 and KL9570 buffer capacitor terminals supplement the extensive I/O system kit
for Motion Control in miniature format and can be integrated in any control environment via Bus Couplers.
Overvoltage protection
55 V DC
t
U
Fig. 5 Prevention of overvoltage
The KL9570 and EL9570 buffer capacitor terminals can absorb the energy generated by highly dynamic drives due to their
500 µF capacitors, which are particularly resistant to ripple current. If the fed-back energy exceeds the capacity of the
New Automation Technology Beckhoff 
For application notes see disclaimer on the last page