Delta ASDA-B3 Series User Manual page 47

Installation
When the regenerative energy exceeds the capacity of the built-in regenerative resistor, use an
external regenerative resistor. Pay special attention to the following when using a regenerative
resistor:
2
1. Choose the correct resistance value (P1.052) and capacity (P1.053) for the regenerative
resistor; otherwise it might affect the performance.
2. When using an external regenerative resistor, ensure the total resistance value is greater
than the minimum allowable resistance value of the servo drive. For general applications,
you can connect more than one resistor in series. If the value from resistors connected in
series exceeds the rated range, you can reduce the value by connecting the resistors in
parallel. If you want to connect the resistors in parallel to increase the power of the
regenerative resistors, make sure the resistance value meets the requirements.
See the following diagrams and settings for connecting the regenerative resistors in series
and parallel.
3. Normally, if the capacity of the regenerative resistor (the average value) is within the rated
capacity, the temperature can increase to 120°C (248°F) or even higher (under the
condition that the regenerative energy continues to function). For safety reasons, apply
forced cooling to reduce the temperature of the regenerative resistor. Alternatively, you can
use regenerative resistors equipped with thermal switches. Contact the manufacturer for the
load characteristics of the regenerative resistor.
2-18
Connect to one external regenerative resistor
P
1 kW, 10Ω
C
Connect to external regenerative resistors (serial connection)
P
1 kW, 10Ω
1 kW, 10Ω
C
Connect to external regenerative resistors (parallel connection)
P
1 kW, 10Ω
C
P1.052 = 10 (Ω)
P1.053 = 1000 (W)
P1.052 = 20 (Ω)
P1.053 = 2000 (W)
P1.052 = 5 (Ω)
1 kW, 10Ω
P1.053 = 2000 (W)
ASDA-B3