Yaskawa LEGEND Digital Torque Amplifier - Manual (Page 60)

4.5 Regenerative Resistor Selection
49
Regenerative Unit Specifications
SGDG-04GT
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 it doesn’t activate the regen IGBT. Thus, when an external resistor is
connected, the regen energy is still processed by internal regen capacity. The alarm #4
(overvoltage) will occur if the regen energy is too high. To add external regen capability
to the SGDG-04GT, one of the following methods may be used:
1. Use external regen unit JUSP-RG08D. Refer to the information in the
table above for more details. When this external regen unit is used, #5
of SW1 in the SGDG-04GT should be turned OFF to avoid erroneous
alarms.
or
2. Use SGDG-04GTY22P for external regen application only. If the user knows that the
application requires extra regen capacity, the Y-mod unit must be ordered. 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. Therefore,
the items required are:
1 x SGDG-04GTY22P
2 x RH500N25_ohmK
Type
JUSP-RG08
JUSP-RG08D
Remarks
Applicable Servopack SGDG Servopack
Regenerative Working Voltage 380Vdc
Regenerative Processing Current 8Adc Regenerative resistance:50
Ω
60W
Error Detection Function
Regenerative resistance
disconnection, regenerative
transistor fault, overvoltage
Alarm Output
Normally closed contact (open
when protective function
operates)
200V operation ok
Dimensions in mm
(inches)
55W x 160H x 130D
(2.17W x 6.30H x 5.31D)