Delta Electronics ASDA-B Series Manual Do Utilizador

Chapter 6  Control Modes of Operation|ASDA-B Series

 

6-36  

 

Revision January, 2009

When the servo motor runs with load, the allowable frequencies will change according to the changes of 

the load inertia and rotation speed. Use the following equation to calculate the allowable frequency.  

Allowable fr equency =   

Allowable frequency when serv o motor  run without load 

m + 1

x

Rated s peed 

Operating speed

times

mi n.

2

m = load/motor inertia ratio 

The users can select the adequate regenerative resistors according to the allowable frequencies by 

referring to the table below: 

Allowable frequency when the servo motor run without load (times/min) 

100W 

200W 

300W 

400W 

(60mm) 

400W 

(80mm) 

ECMA Series 

 
Regenerative  
Resistors 

01 

02 

03 

04 

04 

BR400W040 -  -  - 

8608 

3279 

BR1K0W020 -  -  - 

21517 

8765 

500W 

600W 

750W 

900W 

1.0kW 

(100 mm) 

ECMA Series 

 
Regenerative  
Resistors 

05 

06 

07 

09 

10 

BR400W040  291  283 2128 213  925 

BR1K0W020  729  708 5274 533 2312 

1.0KW 

(130mm) 

1.5KW 

2.0kW 

(100mm) 

2.0KW 

(130mm) 

2.0KW 

(180mm) 

ECMA Series 

 
Regenerative  
Resistors 

10 

15 

20 

20 

20 

BR400W040  283 213 562 163  68 

BR1K0W020  708  533 1363 408  171 

 (  ) : motor frame size, unit is in millimeters. 

Table 6.L 

 

When the servo drive is operating, if the digital output BRKR is set to Off, it indicates the 

electromagnetic brake is disabled and motor is stop running and locked. If the digital output BRKR is set 

to ON, it indicates electromagnetic brake is enabled and motor can run freely.  

There are two parameters that affect the electromagnetic brake. One is parameter P1-42 (MBT1) and 

the other is parameter P1-43 (MBT2). The users can use these two parameters to set the On and Off 

delay time of electromagnetic brake. The electromagnetic brake is usually used in perpendicular axis (Z-

axis) direction to reduce the large energy generated from servo motor. Using electromagnetic brake can 

avoid the load may slip since there is no motor holding torque when power is off. Without using 

electromagnetic brake may reduce the life of servo motor. To avoid malfunction, the electromagnetic 

brake should be activated after servo system is off (Servo Off).