Delta Electronics ASDA-B2 series User Manual page 30

ASDA-B2
processed is used at or below the rated load ratio, the resistance temperature will
increase to 120°C or higher (on condition that when the regeneration continuously
occurred). For safety reasons, forced air cooling is good way that can be used to
reduce the temperature of the regenerative resistors. We also recommend the users
to use the regenerative resistors with thermal switches. As for the load
characteristics of the regenerative resistors, please check with the manufacturer.
External Regenerative Resistor
When using external regenerative resistor, connect it to P and C, and make sure the circuit
between P and D is open. We recommend the users should use the external regenerative
resistor that the resistance value following the above table (Built-in Regenerative Resistor
Specifications). We ignore the dissipative power of IGBT (Insulated Gate Bipolar
Transistor) in order to let the users easily calculate the capacity of regenerative resistor. In
the following sections, we will describe Regenerative Power Calculation Method and
Simple Calculation Method for calculating the regenerative power capacity of external
regenerative resistors.
(1) Regenerative Power Calculation Method
(a) Without Load
When there is no external load torque, if the servo motor repeats operation, the
returned regenerative power generated when braking will transmitted into the
capacitance of DC bus. After the capacitance voltage exceeds some high value,
regenerative resistor can dissipate the remained regenerative power. Use the table and
procedure described below to calculate the regenerative power.
Servo Drive
Servo Motor
(kW)
0.1 ECMA-C20401
0.2 ECMA-C20602
ECMA-C20604
0.4
Low
ECMA-C20804
Inertia
0.75 ECMA-C20807
1.0 ECMA-C21010
2.0 ECMA-C21020
0.4 ECMA-E21305
1.0 ECMA-E21310
Medium
1.5 ECMA-E21315
Inertia
ECMA-E21320
2.0
ECMA-E21820
Revision September 2013
info@varitel.com - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.
VARITEL INGENIERIA ELECTRONICA S.A.
Rotor Inertia
-4
J (× 10 kg.m
0.037
0.177
0.277
0.68
1.13
2.65
4.45
8.17
8.41
11.18
14.59
34.68
Chapter 2 Installation and Storage
Regenerative power
from empty load
2
3000r/min to stop
)
Eo (joule)
0.18
0.87
1.37
3.36
5.59
13.1
22.0
40.40
41.59
55.28
72.15
171.50
Max. regenerative
power of
capacitance
Ec(joule)
3
4
8
14
18
21
8
18
18
21
2-9