3-30
Connect an external regeneration resistor when the regeneration processing power of the Regenera-
tion Unit (12 W) is exceeded. Refer to
3-8-3 Absorption of Regenerative Energy with the External Re
-
generation Resistor for details on external regeneration resistors.
3-8-2 Servo Driver Absorbable Regenerative Energy
Regenerative Energy Absorbed Internally
The Servo Driver absorbs regenerative energy by means of an internal capacitor. If there is more regen-
erative energy than can be absorbed by the capacitor, an overvoltage error will be generated and opera-
tion cannot continue. The amounts of regenerative energy that can be absorbed by the various Servo
Drivers alone are shown in the tables below. If regenerative energy exceeding these values is pro-
duced, take the following measures.
•
Connect a Regeneration Unit (R88A-RG08UA). (Non-conforming Models)
•
Lower the operating rotation speed. (The regenerative energy is proportional to the square of the
rotation speed.)
•
Lengthen the deceleration time. (Reduce the amount of regenerative energy per unit time.)
•
When using multiple axes, the + terminals can be connected together and the – terminals can be
connected together to use regenerative energy as the drive energy for the other axes. (Models Con-
forming to EC Directives)
j
200-VAC Input Type
Model
Absorptive regen-
eration energy (J)
Maximum applicable
load inertia
(x10
–4
kg
m
2
)
Remarks (see note *3)
R88D-UEP04H/UEP04V
(100 W)
13.3
1.2
Rotor inertia
×
30, 4,500 r/min
R88D-UEP08H/UEP08V
(200 W)
23.9
3.69
Rotor inertia
×
30, 3,000 r/min
R88D-UEP12H/UEP12V
(400 W)
21.1
3.8
Rotor inertia
×
20, 3,000 r/min
R88D-UEP20H/UEP20V
(750 W)
52.2
13.4
Rotor inertia
×
20, 3,000 r/min
Note 1. The input voltage is the value at 200 VAC. As the input voltage is increased, the amount of
regenerative energy that can be absorbed is decreased.
Note 2. For Servomotors with brakes, add the brake inertia to the load inertia.
Note 3. This is the applicable range for the horizontal shaft. (No external force should be applied.)
Operation
Chapter 3
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