AKD2G Product Safety Guide | 9 Appendix
9.1.3 Electrical Motor Braking
9.1.3.1 Dynamic Braking
Dynamic braking is a method to slow down a servo system by dissipating the mechanical
energy driven by the motor back EMF.
Dynamic braking is not functional safe. Safe dynamic braking (SDB) requires an external
SDB module
9.1.3.2 Rheostatic energy dissipation
When the amount of motor back EMF builds the bus capacitor voltage up enough the drive
activates the rheostatic regenerative circuit to start dumping the returned energy in the regen
resistor (also called regenerative resistor or brake resistor).
External regen resistors are described in the regional Accessories Manual.
9.1.3.2.1 Technical data for AKD2G-Sxx-6V
Brake circuit AC Supply
AKD2G-Sxx- Rated data Units 120V / 240V
6Vxxy
all types
Switch-on threshold of regenerative circuit V 380
Overvoltage limit V 420
Maximum regenerative duty cycle % 15*
AKD2G-Sxx- Rated data Units 120V / 240V
6V03S Internal regen resistor Ω 15
Continuous power, internal resistor W tbd
Peak brake power, internal resistor (0.5s) kW tbd
External regen resistor Ω 33
Continuous brake power, external resistor kW tbd
Peak brake power, external (1s) kW tbd
6V06S,
6V03D
Internal regen resistor Ω 15
Continuous power, internal resistor W tbd
Peak brake power, internal resistor (0.5s) kW tbd
External regen resistor Ω 33
Continuous brake power, external resistor kW tbd
Peak brake power, external resistor (1s) kW tbd
6V12S,
6V06D
Internal regen resistor Ω 15
Continuous power, internal resistor W tbd
Peak brake power, internal resistor (0.5s) kW tbd
External regen resistor Ω 33
Continuous brake power, external resistor kW tbd
Peak brake power, external resistor (1s) kW tbd
* depends on connected regen resistor power.
58 Kollmorgen | kdn.kollmorgen.com | Beta, December 2018
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