5-69
5-6-7 Selecting for External Regeneration Resistor
z In applications where a high inertia load is stopped rapidly, motor will generate an energy,
which is regenerate power back to the servo drive (Regeneration energy)
(1) Short deceleration time with heavy loads.
(2) In vertical load applications.
(3) High inertia rotary load applied to the motor shaft.
z Part of the regeneration power will be absorbed by the drive main smoothing capacitors.
z If there is too much regeneration power which can not be totally absorbed by the
capacitor then regeneration resistors can be used to absorb the excess power
z Built-in Regeneration Resistor specification is as below table.
Built-in Regeneration
Resistor Specifications
Drive Model
Resistance(Ω) Power(W)
The Regeneration
Power(W) absorbed by
the built in Resistor
(Average Power)
Minimum allowed
Resistance Value
(Ω)
JSDEP-15 25 60 24 25
JSDEP-20 50 60 24 25
JSDEP-30 25 60 24 25
JSDEP-50 20 150 60 15
JSDEP-75 12.5 150 60 10
Built-in Regeneration Resistor
The Regeneration Resistor which is built-in this device can absorb the Regeneration
Power from acceleration and deceleration running or Vertical Loading.
But for applications that the large load inertia causes the motor shaft to rotate, an
external regeneration Resistor must be installed to protect the servo drive otherwise
the servo drive can not function correctly.
Select the resistor according to the specified values and if installing regeneration
resistors in a parallel way to have more power absorb capacibility.
Ensure that the total resistance value does not smaller than the minimum
resistance listed in the table above.
Setting for the Power of External Regeneration Resistor
When using external regeneration resistor, the power value (Watts) must be set in
parameter Cn012.
Parameter Name Default Unit Setting Range Control Mode
Cn012
Watts setting for
External Regeneration
Resistor
0 W 0~10000 ALL
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