Brake Chopper; Fault Functions - ABB ACS800 Firmware Manual

Index Name/Selection

27 BRAKE CHOPPER

27.01 BRAKE CHOPPER
CTL
OFF
ON
27.02 BR OVERLOAD
FUNC
NO
WARNING
FAULT
27.03 BR RESISTANCE
0.00 ... 100.00 ohm
27.04 BR THERM T CONST Defines the thermal time constant of the brake resistor. The value is used in the
0.000 ... 10000.000 s
27.05 MAX CONT BR
POWER
0.00 ...10000 kW
27.06 BC CTRL MODE
AS GENERATOR
COMMON DC

30 FAULT FUNCTIONS

30.01 AI<MIN FUNCTION
FAULT
NO
30.02 PANEL LOSS
FAULT
NO
Description
Control of the brake chopper.
Activates the brake chopper control.
Inactive
Active. Note: Ensure the brake chopper and resistor are installed and the
overvoltage control is switched off (parameter 20.05).
Activates the overload protection of the brake resistor. The user-adjustable
variables are parameters 27.04
Inactive
Active. If the drive detects an overload, it generates a warning.
Active. If the drive detects an overload, it trips on a fault.
Defines the resistance value of the brake resistor. The value is used for brake
chopper protection.
Resistance value
overload protection. See parameter 27.02.
With the SACE brake resistors, the parameter setting must be 200 s.
With the SAFUR brake resistors, the parameter setting must be 555 s.
Time constant
Defines the maximum continuous braking power which will raise the resistor
temperature to the maximum allowed value. The value is used in the overload
protection. See parameter 27.02.
Power
Selects the control mode of the braking chopper.
Chopper operation is allowed when the DC voltage exceeds the braking limit,
the inverter bridge modulates and the motor generates power to the drive.
The selection prevents the operation in case the intermediate circuit DC
voltage rises due to abnormally high supply voltage level. Long time supply
voltage rise would damage the chopper.
Chopper operation is allowed always when the DC voltage exceeds the
braking limit. The selection is to be used in applications where several
inverters are connected to the same intermediate circuit (DC bus).
WARNING! Excessive supply voltage will raise the intermediate circuit
voltage above the operation limit of the chopper. If the voltage remains
abnormally high for a long period, the braking chopper will be
overloaded and damaged.
Programmable protection functions
Selects how the drive reacts when an analogue input signal falls below the set
minimum limit.
Note: The analogue input minimum setting must be set to 0.5 V (1 mA) or
above (see parameter group
The drive trips on a fault and the motor coasts to stop.
Inactive
Selects how the drive reacts to a control panel communication break.
Drive trips on a fault and the motor stops as defined with parameter 21.03.
Inactive
and 27.05.
13 ANALOGUE INPUTS).
FbEq
0
65535
0
1
2
0 ... 100
1 = 1
1 = 1
0
65535
1
2
1
2
Actual signals and parameters
187