Delta Electronics ASDA-B2 series User Manual page 31

Chapter 2 Installation and Storage
Servo Drive
Servo Motor
(kW)
ECMA-E21830
3.0
ECMA-F21830
0.4 ECMA-G21303
High
0.75 ECMA-G21306
Inertia
1.0 ECMA-G21309
2
Eo = J x wr /182 (joule), Wr : r/min
If the load inertia is N × motor inertia, the regenerative power will be (N+1) x E0 when
servo motor brakes from 3000r/min to 0. Then, the regenerative resistor can dissipate:
(N+1) x E0 - Ec (joule). If the time of repeat operation cycle is T sec, then the
regenerative power = 2 x ((N+1) x E0 - Ec) / T.
The calculating procedure is as follows:
Step
Set the capacity of regenerative
1
resistor to the maximum
2 Set the operation cycle T
3 Set motor speed wr
4 Set load/motor inertia ratio N
Calculate the max. regenerative
5
power Eo
Set the regenerative power Ec
6
that can be absorbed
Calculate the required
7
regenerative power capacity
For example:
If we use 400W servo drive, the time of repeat operation cycle is T = 0.4 sec, max.
motor speed is 3000r/min, the load inertia = 7 × motor inertia, then the necessary the
power of regenerative resistor = 2 x ( (7+1) × 1.68 - 8) / 0.4 = 27.2W. If the calculation
result is smaller than regenerative power, we recommend the users to use the built-in
60W regenerative resistor. Usually the built-in regenerative resistor provided by ASDA-
B2 series can meet the requirement of general application when the external load
inertia is not excessive.
The users can see when the capacity of regenerative resistor is too small, the
accumulated power will be larger and the temperature will also increase. The fault,
ALE05 may occur if the temperature is over high. The following figure shows the actual
operation of regenerative resistor.
2-10
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
54.95
54.95
8.17
8.41
11.18
Procedure
Change the value of P1-53 to maximum
Input by the users
Input by the users or read via P0-02 Drive State
Display
Input by the users or read via P0-02 Drive State
Display
Eo = J x wr
Refer to the table above
2 x (N+1) x Eo－Ec）/ T
Regenerative power
from empty load
2
3000r/min to stop
)
Eo (joule)
271.73
271.73
40.40
41.59
55.29
Equation and Setting Method
2
/182
ASDA-B2
Max. regenerative
power of
capacitance
Ec(joule)
28
28
8
14
18
Revision September 2013