A p p e n d i x D : P r o g r a m m i n g
D-35
AC890PX AC Drive
Functional Description
When enabled, the DYNAMIC BRAKING block monitors the internal dc link voltage every milli-second and sets the state of the brake switch
accordingly.
The dynamic braking block provides a control signal that is used by the SLEW RATE LIMIT block. This causes the setpoint to be temporarily
frozen whenever the dynamic brake is operating because the dc link voltage exceeds the internal comparison level. This allows the stop rate to be
automatically tuned to the characteristics of the load, motor, Drive and brake resistor.
The DYNAMIC BRAKING block operates even when the motor output is not enabled. This allows the block to continually monitor the energy
dumped into the braking resistor, and the energy dissipated across the brake switch. With this information the Drive is able to deduce the loading on
the brake resistor. Optional trips may be enabled should the switch or resistor be loaded beyond its capabilities.
The "Brake Resistor" and "Brake Switch" trips are disabled by default. To enable these trips, refer to TRIPS STATUS, page D-159. When using
dynamic braking, the brake resistor information must be entered and these two trips enabled.
Refer also to Chapter 7: “Operating the Drive” - Dynamic Braking.
Summary of Contents for AC890PX Series
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Page 12: ...1 4 C h a p t e r 1 G e t t i n g S t a r t e d AC890PX AC Drive...
Page 17: ...C h a p t e r 2 P r o d u c t O v e r v i e w 2 5 AC890PX AC Drive 890PX bottom wire entry...
Page 22: ...2 10 C h a p t e r 2 P r o d u c t O v e r v i e w AC890PX AC Drive...
Page 74: ...4 8 C h a p t e r 4 A s s o c i a t e d E q u i p m e n t AC890PX AC Drive...
Page 96: ...5 22 C h a p t e r 5 O p e r a t i n g t h e D r i v e AC890PX AC Drive...
Page 162: ...8 22 C h a p t e r 8 T r i p s F a u l t F i n d i n g AC890PX AC Drive...
Page 170: ...9 8 C h a p t e r 9 R o u t i n e M a i n t e n a n c e R e p a i r AC890PX AC Drive...
Page 286: ...D 84 A p p e n d i x D P r o g r a m m i n g AC890PX AC Drive Functional Description...