User manual

AMD2000 Series - Servo Drive - User Manual
172 DS619-0-00-0019 - Rev 0 ANCA Motion
12.14 Brake/Regeneration Resistor
The AMD2000 3A and AMD2000 9A drives have an inbuilt regeneration resistor. Regeneration refers to the
process whereby when the motor is actively providing energy to the drive and then stops, the kinetic energy in
the entire mechanical system connected to the shaft of the motor gets transferred to the bus capacitance in the
drive, which increases the voltage. This happens because of the motor inductance. When the voltage on the
bus capacitance exceeds 385V the drive will connect the internal regeneration resistor in addition to any external
regeneration resistor that is provided by the user. The internal resistor is only capable of dissipating a power of
40W for the AMD92000 3A and 60W for the AMD2000 9A. In addition to the power rating of the resistor to be
observed the instantaneous energy maximum for each resistor must also be observed. This is 24.7 joules for the
AMD 2000 3A drive and 143 joules for the AMD 9. If there is more regeneration power than this is created then
the user must connect an external resistor.
In addition to the power dissipation constraint of the regeneration resistors, the internal bulk capacitance of the
drive is 440µF for the AMD2000 3A and 1410µF for the AMD2000 9A with a working voltage of 400V. This value
of 400V must never be exceeded. The user must calculate what the bus voltage will increase to due to the
capacitance given the energy in the mechanical system. Note that if external bus capacitance is used (for
smoother bus ripple) then this capacitance must be added also.
AMD2000
C
D
Internal Regeneration
Resistor:
40W(3A drive
/
60W (9A drive)
DC Bus Capacitors:
<400V,
440µF(3A drive)
/
1410µF/(9A drive)
External Regeneration
Resistor(s) as required
External Capacitor(s)
as required
X2B
12.14.11 Brake Resistor Selection, Braking Energy and Power
The starting points for the calculations regarding the required regeneration resistor are the two equations for
kinetic energy in the system, and are dependent entirely on the application of the user.
Linear:
 




Where E = Energy in Joules
m = mass in kg
v = velocity in m/s
Rotational:
 




Where E = energy in Joules
J = moment of inertia in kgm
2
ω = angular velocity in rad/s