YASKAWA SGMAH, User Manual

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Sigma II User’s Manual Chapter 5: Parameter Settings and Functions
5-84
5.6.1 External Regenerative Resistor
When installing an external regenerative resistor, a parameter setting must be
changed as shown below.
The default setting of “ 0 ” in the above table is the set value when the servo
amplifier’s built-in resistor is used or when a servo amplifier without a built-in
resistor is used.
When installing an external regenerative resistor, set the regenerative resistor’s
capacity (W).
Example: When the external regenerative resistor’s actual consumable capacity is 100W, set the parameter
to “10” (10 x 10W = 100W).
When using a JUSP-RA14 external resistor pack rated at 4800 watts, set Pn600 to 240 if there is
forced air cooling for the resistor. Set Pn600 to 96 if natural convection cooling is used. For
details, see notes 1 and 2 below.
Notes: 1. In general, when resistors for power are used at the rated load ratio, the resistor temperature
increases to between 200°C and 300°C. The resistors must be used at or below the rated values.
Check with the manufacturer for the resistor’s load characteristics. Use resistors at no more than
20% of the rated load ratio with natural convection cooling, and no more than 50% of the rated
load ratio with forced air cooling. Parameter Pn600 must be set for the derated resistor.
2. Use of resistors with thermal switches is recommended as a safety precaution.
Parameter Signal
Setting
(x 10W)
Description
Pn600 Regenerative Resistor Capacity
Setting Range: 0 to maximum
Default Setting: 0
Speed/Torque Control,
Position Control