Electrical Installation
AGD301 Product Manual Rev.2.0
Page 18
3.3 Electrical Installation
3.3.1 Power Wiring
AGD301 is designed to operate on voltage ranging from 12 VDC to 90 VDC, which is supplied to bus
voltage, to motor, and to logic power.
3.3.2 Regeneration
AGD301 uses the main DC power input to output a controlled electrical power through the phases of
the motor. The motor converts this electrical power to a mechanical power that moves the load.
During motor deceleration and stopping, the inertia of the load drives the movement of the motor,
not the servo drive. Due to back EMF, the motor acts as a generator and returns energy to the DC bus
supply, which causes the DC bus voltage to increase to undesirable level.
Maximum allowable DC bus voltage is 90 VDC. To prevent excessive DC bus voltage, a regeneration
resistor can be connected to the AGD301 X10 connector to dissipate excess regenerated energy, and
prevent it from reaching undesirable levels. The regeneration resistor starts to dissipate energy when
actual bus voltage reaches threshold defined by RegenOn parameter. Regeneration voltage threshold
parameters are software configurable and can be modified according to the motor’s maximum
voltage specification.
AGD301 controllers have one regeneration resistor input for both axes. Regeneration power of two
motors must be taken into consideration when selecting the resistor.
Warning
DC Vbus is monitored, and motors will be disabled if voltage is too high. However, there
is no protection against the connection of an excessive voltage power supply that will
damage the product.
For connection details, refer to the section
Important Notes
The regeneration feature, once enabled, is always active, regardless of the motor status
(enabled/disabled).
Current will flow in the regeneration resistor depending on the values of RegenOn and RegenOff,
and the power supply voltage.
There are no current or power protections to protect the regeneration resistor or the internal
MOSFET.
Be sure to set the suitable regeneration parameters for the supply voltage and the external
regeneration resistor.
Plug in the regeneration resistor only after all parameters are set properly, and always when the
controller power is off.
Let the regeneration resistor cool down before touching it. Unplug it only when the controller
power is off.
During development, if the supply voltage is to be modified, first disconnect the regeneration
resistor and, before reconnecting the regeneration resistor, be sure to adjust the regeneration
parameters to match the new supply voltage.
We recommend adding external protections (such as PTC) to protect the regeneration resistor.
