Regenerative Resistor; Built-In Regenerative Resistor; Built-In Regenerative Resistor Specifications - Delta ASD-B2-0121-B User Manual

2.7

Regenerative Resistor

Built-in Regenerative Resistor

When the output torque of servo motor in reverse direction of motor rotation speed, it
indicates that there is a regenerative power returned from the load to the servo drive. This
power will be transmitted into the capacitance of DC Bus and result in rising voltage. When
the voltage has risen to some high voltage, the servo system need to dissipate the extra
energy by using a regenerative resistor. ASDA-B2 series servo drive provides a built-in
regenerative resistor and the users also can connect to external regenerative resistor if more
regenerative capacity is needed.
The following table shows the specifications of the servo drive's built-in regenerative resistor
and the amount of regenerative power (average value) that it can process.
Servo Drive Resistance (Ohm)
(kW) (parameter P1-52)
0.1
0.2
0.4
0.75
1.0
1.5
2.0
3.0
*1 Regenerative Power Calculation: The amount of regenerative power (average value) that
can be processed is rated at 50% of the capacity of the servo drive's built-in regenerative
resistor. The regenerative power calculation method of external regenerative resistor is the
same.
When the regenerative power exceeds the processing capacity of the servo drive, install an
external regenerative resistor. Please pay close attention on the following notes when using a
regenerative resistor.
1. Make sure that the settings of resistance (parameter P1-52) and capacity (parameter P1-
53) is set correctly.
2. When the users want to install an external regenerative resistor, ensure that its
resistance value is the same as the resistance of built-in regenerative resistor. If
combining multiple small-capacity regenerative resistors in parallel to increase the
regenerative resistor capacity, make sure that the resistance value of the regenerative
resistor should comply with the specifications listed in the above table.
3. In general, when the amount of regenerative power (average value) that can be
processed is used at or below the rated load ratio, the resistance temperature will
Revision June 2010

Built-in Regenerative Resistor Specifications

Capacity (Watt)
(parameter P1-53)
--
--
--
100 60
40 60
40 60
40 60
40 60
Chapter 2 Installation and Storage
Regenerative Power
processed by built-in
regenerative resistor
(Watt) *
--
--
--
Min. Allowable
Resistance
(Ohm)
1
--
--
--
30
30
30
60
60
60
60
60
60
30
30
15
15
2-9