
SINUS/ISD
15P0082B8
USER MANUAL
6 - 25/82
6.4.1.14
DYNAMIC BRAKING
The dynamic braking function block
controls the rate at which energy from
a regenerating motor is dumped into a
resistive load. This dumping prevents
the internal voltage in the SINUS/ISD
inverter from reaching levels which
could damage the SINUS/ISD inverter
electronics.
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 operated on by the slew rate limits block. This causes
the setpoint to be temporarily frozen whenever 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, Inverter 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 inverter is able to deduce the loading on the brake resistor. An optional trip may
be enabled should the resistor be loaded beyond its capabilities.
Refer also to Chapter 3.3: “Dynamic Braking”.
MMI Menu Map
1
SETUP PARAMETERS
2
FUNCTION BLOCKS
3
MOTOR CONTROL
4
DYNAMIC BRAKING
BRAKE ENABLE
BRAKE RESISTANCE
BRAKE POWER
BRAKE 1S RATING
DC LINK VOLTS
BRAKING
DYNAMIC BRAKING
DYNAMIC BRAKING
DC LINK VOLTS
[ 75] ––0.0 V
BRAKING
[ 81] ––FALSE
TRUE – [ 80] ENABLE
––
100 Ohm –– [ 77] BRAKE RESISTANCE
––
0.1 kW –– [ 78] BRAKE POWER
––
25 –– [ 79] 1 SEC OVER RATING
––
Parameter Descriptions
Parameter Descriptions
ENABLE
ENABLE
Range: FALSE / TRUE
Enables operation of the dynamic braking block.
BRAKE RESISTANCE
BRAKE RESISTANCE
Range:1 to 1000 Ohm
The value of the load resistance.
BRAKE POWER
BRAKE POWER
Range: 0.1 to 510.0 kW
The power that the load resistance may continually dissipate.
1 SEC OVER RATING
1 SEC OVER RATING
Range: 1 to 40
The power that the load resistance may dissipate for 1 second.
DC LINK VOLTS
DC LINK VOLTS
Range: xxxx.x V
The internal dc voltage tested by the braking block.
BRAKING
BRAKING
Range: FALSE / TRUE
A read-only parameter indicating the state of the brake switch.
Summary of Contents for SINUS/ISD 200 S-0.75
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