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5-6-7 Selecting for External Regeneration Resistor<br />
In applications where a high inertia load is stopped rapidly, motor will generate an energy, which is regenerate<br />
power back to the servo drive (Regeneration energy)<br />
(1) Short deceleration time with heavy loads.<br />
(2) In vertical load applications.<br />
(3) High inertia rotary load applied to the motor shaft.<br />
Part of the regeneration power will be absorbed by the drive main smoothing capacitors<br />
If there is too much regeneration power which can not be totally absorbed by the capacitor then regeneration<br />
resistors can be used to absorb the excess power.<br />
Built-in Regeneration Resistor specification is as below table.<br />
Drive Model<br />
Built-in Regeneration<br />
Resistor Specifications<br />
Resistance(Ω)<br />
Power(W)<br />
The Regeneration<br />
Power(W) absorbed by<br />
the built in Resistor<br />
(Average Power)<br />
Minimum allowed<br />
Resistance Value<br />
(Ω)<br />
TSTA-15 50 60 24 50<br />
TSTA-20 50 60 24 41<br />
TSTA-30 25 60 24 23<br />
TSTA-50 20 200 80 15<br />
TSTA-75 12.5 200 80 9<br />
Built-in Regeneration Resistor<br />
The Regeneration Resistor which is built-in this device can absorb the Regeneration Power from<br />
acceleration and deceleration running or Vertical Loading.<br />
But for applications that the large load inertia causes the motor shaft to rotate, an external regeneration<br />
Resistor must be installed to protect the servo drive otherwise the servo drive can not function correctly.<br />
Select the resistor according to the specified values and if installing regeneration resistors in a parallel way to<br />
have more power absorb capacibility.<br />
Ensure that the total resistance value does not smaller than the minimum resistance listed in the<br />
table above.<br />
5-69
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