Eurotherm 584SV Series, Product Manual, Page: 104 / 255

9059##
3URJUDPPLQJ # <RXU # $SSOLFDWLRQ
8;7 69 # 6HULHV # )UHTXHQF\ # ,QYHUWHU
'<1$0,& # %5$.,1*
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 Inverter from
reaching levels which could damage the
Inverter electronics.
)XQFWLRQDO # 'HVFULSWLRQ
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 13: “Application Notes” - Dynamic Braking.
00, # 0HQX # 0DS
4
SETUP PARAMETERS
5
FUNCTION BLOCKS
6
MOTOR CONTROL
7
DYNAMIC BRAKING
BRAKE ENABLE
BRAKE RESISTANCE
BRAKE POWER
BRAKE 1S RATING
DC LINK VOLTS
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
–
3DUDPHWHU # 'HVFULSWLRQV
ENABLE Range: FALSE / TRUE
Enables operation of the dynamic braking block.
BRAKE RESISTANCE
Range:1 to 1000 Ohm
The value of the load resistance.
BRAKE POWER Range: 0.1 to 510.0 kW
The power that the load resistance may continually dissipate.
1 SEC OVER RATING Range: 1 to 40
The power that the load resistance may dissipate for 1 second. This is a 1 to 40 times multiplier
of Brake Power.
DC LINK VOLTS Range: xxxx.x V
The internal dc voltage tested by the braking block.
BRAKING Range: FALSE / TRUE
A read-only parameter indicating the state of the brake switch.