YASKAWA LEGEND SGDG Supplement
2121 Norman Drive South Publication # eng02.027MCD
Waukegan, IL 60085 7/26/2002
(847) 887-7000
Page 1 of 3
ENGINEERING PUBLICATION
MOTION CONTROL DIVISION
PRODUCT: LEGEND SGDG SUBJECT: EXTERNAL REGEN
CATEGORY: APPLICATION NOTES
ENGINEER: 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.
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 Publication # eng02.027MCD
Waukegan, IL 60085 7/26/2002
(847) 887-7000
Page 2 of 3
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. To add external regen capability to the SGDG-
04GT, the following method may be used:
1. Use external regen unit JUSP-RG08D. Refer to the information above for more
details. When this external regen unit is used, SW1-5 in the SGDG-01GT should
be turned OFF to avoid erroneous alarms.
Or
2. Use SGDG-04GTY22P for external regen application only. If the customer knows
that his application requires extra regen capacity, he must order this Y-mod unit.
With Y22P-mod, two (2) external regen resistors, RH500N25_ohmK, wired in
series must be connected to the SGDH-04GT at all times. These resistors should
be connected across terminals B1 and B2. The convection cool capacity of these
two resistors in series is 120W. The capacity increases to 300W with forced-air
cooling
2121 Norman Drive South Publication # eng02.027MCD
Waukegan, IL 60085 7/26/2002
(847) 887-7000
Page 3 of 3
Connecting the JUSP-RG08D to the SGDG-01GT/SGDG-04GT:
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