AKT2G-BRC-000-000

Brake Chopper Terminal

The AKT2G-BRC-000 EtherCAT Terminal contains high-performance capacitors for stabilizing supply voltages.

The AKT2G-BRC-000 can be used, for example, in conjunction with the AKT2G-SM-L50-000 or AKT2G-SM-L15-000 stepper motor terminal. Low internal resistance and high pulsed current capability enable good buffering in parallel with a power supply unit.

Return currents are stored, particularly in the context of drive applications, thereby preventing overvoltages. If the recovery energy exceeds the capacity of the capacitors, energy can be dissipated via an external ballast resistor. The switching threshold for this can be parameterized via the KAS-IDE.

Technical Data

Technical Data AKT2G-BRC-000-000
Technology Brake chopper
Rated voltage up to 72 V
Capacitance 155 µF
Ripple current 10 A in continuous operation
Internal resistance < 10 mΩ
Overvoltage protection Standard 50 V, parameterizable via CoE data
Recommended ballast resistor ZB8110*
Overvoltage control range Standard 1 V, parameterizable via CoE data
Ballast resistor clock rate load-dependent, max. 100 µs, 2-point control
Electrical isolation 1500 V
Diagnostics Temperature on the PCB
Message to E-bus Data for the switch-on behavior of the resistor as well as current and supply voltage
PE contact no
Screen connection -
E-Bus current consumption typ. 80 mA
Power consumption from power contacts 0 mA
Bit width in process image 88 bit
Electrical connection to mounting rail -
Addition to EtherCAT Terminals with power contact yes, left side without PE
Addition to EtherCAT Terminals without power contact yes
Dimensions (W x H x D) approx. 15 mm x 100 mm x 70 mm (width aligned: 12 mm)
Configuration Via CoE data
Weight approx. 90 g
permissible ambient temperature range during operation 0 °C ... +55 °C
permissible ambient temperature range during storage -25 °C ... +85 °C
permissible relative humidity 95 %, no condensation
Mounting on 35 mm mounting rail conforms to EN 60715
Vibration/shock resistance according to EN 60068-2-6/EN 60068-2-27, see also Installation for Enhanced Mechanical Load Capacity
EMC immunity/emission conforms to EN 61000-6-2 / EN 61000-6-4
Protection class IP20
Installation position Any, see Mounting and Wiring of I/O Terminals
Approval CE, cULus

* depending on the application, a larger resistor may be necessary

LEDs and Pin Assignment


  • Correct supply voltage is necessary for operation!

    In addition to the supply voltage via the contacts on the front panel, the voltage from the E-bus must also be present in order for the terminal to work properly, since the integrated logic of the Bus Terminal is supplied with this voltage. The Bus Terminal does not work if the supply is incorrect.


  • Match the resistor power to the expected power!

    When selecting the external resistor, make sure that the rated power of the resistor is matched to the expected power, since otherwise the resistor and adjacent components can be damaged. In addition, the temperature model is to be adapted to this resistor.

Pin Assignment

Terminal Point Description
Name No.
R 50 V (Rexternal) 1 + connection of external resistor
50 V (+Uin) 2 + supply voltage connection
50 V (+Uin) 3 + supply voltage connection
50 V (+Uin) 4 + supply voltage connection
R GND (Rexternal) 5 - connection of external resistor
GND (-Uin) 6 - supply voltage connection
GND (-Uin) 7 - supply voltage connection
GND (-Uin) 8 - supply voltage connection

LEDs

LED Color Meaning  
RUN green This LED indicates the terminal's operating state:
off State of the EtherCAT State Machine : INIT = initialization of the terminal
flashing State of the EtherCAT State Machine: PREOP = function for mailbox communication and different standard-settings set
single flash State of the EtherCAT State Machine: SAFEOP = verification of the Sync Manager channels and the distributed clocks.
The outputs remain in safe state.
on State of the EtherCAT State Machine: OP = normal operating state; mailbox and process data communication is possible
flickering State of the EtherCAT State Machine: BOOTSTRAP = function for firmware updates of the terminal
Out voltage OK green ON Supply voltages are OK, there are no errors
OFF
  • Supply voltage is incorrect, i.e. too high or too low
  • Overtemperature in the temperature simulation
  • Temperature at the terminal too high
Over voltage yellow ON The supply voltage has exceeded the threshold value for overvoltage.
Temp warning yellow ON Temperature threshold value for the temperature on the PCB has been exceeded.
Under voltage yellow ON The supply voltage is too low, or has fallen below the corresponding threshold value in the CoE data.
Temp R warning yellow ON The “I2T warning level” threshold value has been exceeded.
Chopper On yellow ON The external resistor is switched on.
Error red ON + “Undervolt age” LED The supply voltage is not connected or is so low that the “supply voltage” and “ResistorCurrent” values cannot be read.
ON + “Temp R Warning” LED + “Overvolta ge” LED There is an overtemperature in the internal temperature simulation for the external resistor.

Brake Chopper Quick Start

Proceed as follows for standard commissioning of the AKT2G-BRC-000 with an external resistor.

  1. Install the AKT2G-BRC-000 in the E-bus terminal segment on an EtherCAT coupler,.
  2. For operation the AKT2G-BRC-000 requires a supply voltage at connections 2 and 6 (UIN) of the terminal as well as a power supply via the E-Bus. The following must be observed:
    • The supply voltage must be at least 18 VDC.
    • The resistor must be designed to handle the expected power and must be parameterized accordingly via CoE Init-Commands.
    • The voltage supply must be designed for the switching on of the corresponding resistor.
    • Supply quality: the most stable and noise-free supply possible must be ensured.
  3. Parameterize the resistor you are using with CoE Init-Commands according to the data sheet for the resistor.
    • Reverse any previous parameter changes by means of a CoE reset: enter 0x64616F6C in object 0x1011:01.
    • Enter the ambient temperature of the resistor in °C in 0x8000:15.
    • Enter the thermal resistance of the electrical resistor to the environment in m°C/W in 0x8000:16.