Yaskawa FSP Amplifier - Manual (Page 360)

FSP Amplifier User’s Manual Appendix E: External Regenerative Resistor Specifications
E-1
Appendix E. External Regenerative Resistor
Specifications
Power returns to the FSP Amplifier when the servomotor is driven in the generator
mode. This is called regenerative power. The regenerative power is absorbed by
charging the bus smoothing capacitor in the FSP Amplifier. The regenerative resistor
consumes the regenerative power when such power exceeds the chargeable energy of
the capacitor. FSP Amplifiers with capacities of 0.5 kW to 5.0 kW have a built-in
regenerative resistor with limited power capacities. Please refer to section 5.6 for more
details.
Applications with high load to motor inertia mismatches may require additional
regenerative capacity in addition to the built-in amount. To add an external
regenerative resistor to the FSP Amplifier, simply connect a resistor or resistor
network between terminals B1 and B2. For FSP Amplifiers with capacities of
0.5 kWto 5 kW, be sure to remove the jumper wire between terminals B2 and B3.
User parameter Pn600 must be set to identify the external regenerative resistor’s
power capacity.
The external regenerative equivalent resistance should be:
R
min
< R < (144400/ P
rg
), where P
rg
is the needed regenerative power in Watts
The maximum allowable power capacity of the external regeneration resistor is the
rated power capacity of the FSP Amplifier. The minimum allowable resistances for
FSP Amplifiers are listed below. The external regenerative resistor must be equal to or
greater than this value.
Model #
200 V:
FSP-A3A* to 04A*
FSP-08A*
FSP-15A*
FSP-05A* to 10A*
FSP-20A* to 30A*
100 V:
FSP-A3B* to 02B*
400 V:
FSP-05D* to 15D*
FSP-20D* to 30D*
FSP-50D*
R
min
(Ω)
40
40
20
40
12
40
73
44
28