Yaskawa Sigma II Series Servo System - Manual (Page 214)

Sigma II User’s Manual Chapter 5: Parameter Settings and Functions
5-128
5.8.7 DB Unit
Large capacity amplifiers (22-55kW) do not have internal DB resistors. An external
DB unit is needed if dynamic braking function is required for the application.
Externally attach a DB unit to the amplifier.
This DB unit is used for dissipating motor EMF energy.
The DB unit does not need to be installed if the dynamic brake function is not
required.
Specifications
Use one of the following DB units according to the Amplifier model.
SDGH- 2BDE 3ZDE 3GDE 4EDE 5EDE
Regenerative DB Unit JUSP- DB03 DB04 DB05 DB06
DB contactor and surge
absorbtion unit Built into Amplifier Built into DB unit
Resistance 0.8 Ω
Resistance Capacity 180W 300W
Allowable Load Moment of
Inertia 5 times the load moment of inertia at motor shaft.
Allowable Duty Less than 1 time/H at maximum speed DB operation.