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Sigma II User's Manual
External Regenerative Resistor
5.6.1
When installing an external regenerative resistor, a parameter setting must be changed as
shown below.
Parameter
Pn600
Regenerative Resistor Capacity
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)
Note: 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.
2.
Use of resistors with thermo switches is recommended as a safety precaution.
n
Connecting Regenerative Resistors
The method for connecting regenerative resistors is shown below.
Servo Amplifier Capacity of 400W or Less
Connect an external regenerative resistor between the servo amplifier's B1 and B2
terminals.
Servo Amplifier Capacity of 500W or More
Disconnect the wire between the servo amplifier's B2 and B3 terminals and connect
an external regenerative resistor between the B1 and B2 terminals.
Signal
Setting Range: 0 to maximum
Default Setting: 0
Servo amplifier
B1
B2
5-83
Chapter 5: Parameter Settings and Functions
Setting
(x 10W)
Regenerative resistor*
*The user must provide the regenerative resistor.
Description
Speed/Torque Control,
Position Control
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