Sigma II User’s Manual Chapter 5: Parameter Settings and Functions5-845.6.1 External Regenerative ResistorWhen installing an external regenerative resistor, a parameter setting must bechanged as shown below.The default setting of “0”in the above table is the set value when the servoamplifier’s built-in resistor is used or when a servo amplifier without a built-inresistor is used.When installing an external regenerative resistor, set the regenerative resistor’scapacity (W).Example: When the external regenerative resistor’s actual consumable capacity is 100W, set the parameterto “10” (10 x 10W = 100W).When using a JUSP-RA14 external resistor pack rated at 4800 watts, set Pn600 to 240 if there isforced air cooling for the resistor. Set Pn600 to 96 if natural convection cooling is used. Fordetails, see notes 1 and 2 below.Notes: 1. In general, when resistors for power are used at the rated load ratio, the resistor temperatureincreases 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 than20% of the rated load ratio with natural convection cooling, and no more than 50% of the ratedload 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) DescriptionPn600 Regenerative Resistor Capacity Setting Range: 0 to maximumDefault Setting: 0 Speed/Torque Control,Position Control
