YASKAWA SGDS Sigma III Series, User Manual

Page: 131 / 376

5 Wiring
5.7.2 Connecting Externally Regenerative Resistors
5-26
(3) Precautions on Selecting External Regenerative Resistors
• A built-in regenerative resistor is provided for 500 W to 1.0 kW SGDS SERVOPACKs as standard.
When installing an external regenerative resistor in the SERVOPACK, make sure that the resistance is the
same as that of the SERVOPACK’s built-in resistor.
• If combining multiple small-capacity regenerative resistors to increase the regenerative resistor capacity
(W), select resistors so that the resistance value including error is at least as high as the minimum
allowable resistance shown in the preceding table.
Connecting a regenerative resistor with the resistance smaller than the minimum allowable resistance may
increase the current flow in the regeneration circuit, resulting in damage to the circuit.
(4) Parameter Setting
1. 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 regenerative 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.
Example: Set 20 W (100 W
×
20% ) For the 100 W external regenerative resistor with natural cooling
method: Pn600 = 2 (units: 10 W)
2. For safety’s sake, use the resistors with thermoswitches.
Pn600
Regenerative Resistor Capacity
Setting Range Unit Factory Setting Setting Validation
0 to SERVOPACK
capacity
10 W 0 W Immediately
Be sure to set this parameter when installing an external regenerative resistor in the SERVOPACK.
When set to the factory setting of “0,” the SERVOPACK’s built-in resistor has been used.
Set the regenerative resistor capacity within tolerance value. When the set value is improper, alarm A.320 is not detected
normally. Also, do not set other than 0 without connecting the regenerative resistor because alarm A.300 or A.330 may be
detected.
Speed
Position Torque
IMPORTANT