Delta Electronics ASDA-B Series manual „ Simple Calculation Method

Chapter 6 Control Modes of OperationASDA-B Series

Motor Rotation Speed

External Load Torque

Motor Output Torque

Reverse	Forward	Reverse	Forward
Rotation	Rotation	Rotation	Rotation

External load torque in reverse direction: TL* Wr TL : External load torque

For the safety, we strongly recommend the users should select the proper resistance value according to the load.

For example, when external load torque is a +70% rated torque and rotation speed reaches 3000 rpm, if using 400W servo drive (rated torque: 1.27Nt-m), then the users need to connect a external regenerative resistor which power is 2 × (0.7 × 1.27) × (3000 × 2 × π/ 60) = 560W, 40Ω.

„Simple Calculation Method

The users can select the adequate regenerative resistors according to the allowable frequency required by actual operation and the allowable frequency when the servo motor run without load. The allowable frequency when the servo motor run without load is the maximum frequency that can be operated during continuous operation when servo motor accelerate from 0rpm to rated speed and decelerate from rated speed down to 0rpm. The allowable frequencies when the servo motor run without load are summarized in the following table.

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

ECMA Series Power	100W	200W	300W	400W	400W	500W	600W	750W
Range				(60mm)	(80mm)
(Frame Size)	01	02	03	04	04	05	06	07
Allowable Frequency	-	-	-	1275	519	43	41	319
(times/min)
ECMA Series Power	900W	1.0kW	1.0KW	1.5KW	2.0kW	2.0KW	2.0KW
Range		(100mm)	(130mm)		(100mm)	(130mm)	(180mm)
(Frame Size)	09	10	10	15	20	20	20
Allowable Frequency	31	137	42	31	82	24	10
(times/min)
			Table 6.K

Revision January, 2009 6-35