YASKAWA LEGEND SGDG Application Notes

External regen

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ENGINEERING PUBLICATION

MOTION CONTROL DIVISION

PRODUCT: LEGEND SGDG

CATEGORY: APPLICATION NOTES

ENGINEER:

Bill Leang

Summary

The Legend SGDG-01GT and SGDG-04GT needs special attention when

external regen resistor is required in the application. The JUSP-RG08D external regen

unit should be used with SGDG-01GT. The SGDG-04GTY22P must be used with two

RH500N25_ohmK external resistors. The JUSP-RG08D can also be used with the

standard SGDG-04GT.

The SGDG-01GT does not have the regen transistor built-in even though there are

terminals for connecting an external regen resistor. Therefore, for external regen

requirement, the JUSP-RG08D external regen unit must be used. This is the regen unit

designed for SGDA amplifiers. This unit connects directly across the DC bus. It is a self-

contain unit consisting of bus sensing circuitry, switching IGBT, 50 ohm power resistor,

and alarm relay contacts. The regen capacity of this unit is 60W before derating. The

convection cool capacity is 12W. Capacity increases to 30W with forced-air cooling.

The following is the dimension and specifications of the JUSP-RG08D:

2121 Norman Drive South

Waukegan, IL 60085

(847) 887-7000

SUBJECT: EXTERNAL REGEN

DISTRIBUTION: All

Page 1 of 3

Publication # eng02.027MCD

7/26/2002

Page 1 Bill Leang DISTRIBUTION: All Summary The Legend SGDG-01GT and SGDG-04GT needs special attention when external regen resistor is required in the application. The JUSP-RG08D external regen unit should be used with SGDG-01GT. The SGDG-04GTY22P must be used with two RH500N25_ohmK external resistors. The JUSP-RG08D can also be used with the standard SGDG-04GT.
Page 2 The SGDG-04GT has terminals for connecting an external regen resistor of higher capacity. However, the SGDG-04GT does not automatically recognize this external regen resistor and activate the regen IGBT. Thus, when an external resistor is connected, the regen energy is still processed by internal regen capacity and alarm #4 (over voltage) will occur if the regen energy is too high.
Page 3 Connecting the JUSP-RG08D to the SGDG-01GT/SGDG-04GT: 2121 Norman Drive South Publication # eng02.027MCD Waukegan, IL 60085 7/26/2002 (847) 887-7000 Page 3 of 3...