5.19 Setting the Regenerative Resistor Capacity
5-57
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Ba
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ic Function
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That Requir
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S
etting befor
e Operation
5.19
Setting the Regenerative Resistor Capacity
The regenerative resistor consumes regenerative energy that is generated by the Servomotor,
e.g., when the Servomotor decelerates.
If an External Regenerative Resistor is connected, you must set Pn600 (Regenerative Resistor
Capacity) and Pn603 (Regenerative Resistance).
Set the regenerative resistor capacity to a value that is consistent with the allowable capacity of
the External Regenerative Resistor. The setting depends on the cooling conditions of the Exter-
nal Regenerative Resistor.
•
For self-cooling (natural convection cooling): Set the parameter to a maximum 20% of the
capacity (W) of the actually installed regenerative resistor.
•
For forced-air cooling: Set the parameter to a maximum 50% of the capacity (W) of the actu-
ally installed regenerative resistor.
Note: 1. An A.320 alarm will be displayed if the setting is not suitable.
2. The default setting of 0 specifies that the SERVOPACK’s built-in regenerative resistor or Yaskawa’s Regen-
erative Resistor Unit is being used.
WARNING
If you connect an External Regenerative Resistor, set Pn600 and Pn603 to suitable values.
If a suitable value is not set, A.320 alarms (Regenerative Overload) will not be detected cor-
rectly, and the External Regenerative Resistor may be damaged or personal injury or fire may
result.
When you select an External Regenerative Resistor, make sure that it has a suitable capac-
ity.
There is a risk of personal injury or fire.
Pn600
Regenerative Resistor Capacity
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to SERVOPACK’s
maximum applica-
ble motor capacity
10 W
0
Immediately
Setup
Pn603
Regenerative Resistance
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
0 to 65,535
10 m
Ω
0
Immediately Setup
For a self-cooling 100-W External Regenerative Resistor, set Pn600 to 2 (
×
10 W) (100 W
×
20% = 20 W).
1. When an External Regenerative Resistor is used at the normal rated load ratio, the resistor
temperature increases to between 200
°
C and 300
°
C. Always apply derating. Consult the
manufacturer for the resistor’s load characteristics.
2. For safety, use an External Regenerative Resistor with a thermoswitch.
Speed
Position
Torque
Speed
Position
Torque
Example
Important
