5 Wiring
5.5.1 Regenerative Power and Regenerative Resistance
5-20
5.5 Connecting Regenerative Resistors
5.5.1 Regenerative Power and Regenerative Resistance
The rotational energy of a driven machine, such as servomotor, is returned to the SERVOPACK. This is called
the regenerative power. The regenerative power is absorbed by charging the smoothing capacitor, but when the
chargeable energy is exceeded, the regenerative power is further consumed by the regenerative resistor.
The servomotor is driven into the regeneration state in the following circumstances:
• While decelerating to a stop during acceleration and deceleration operation.
• With a load on the vertical axis.
• During continuous operation with the servomotor rotated from the load side (negative load).
The SERVOPACKs with a capacity of the single-phase 200 V with 50 to 400 W or 100 V with 50 to 400 W do
not have built-in regenerative resistors. If the operation exceeds the rotating speed specifications shown in the
, connect an external regenerative resistor.
5.5.2 Connecting External Regenerative Resistors
(1) Necessity of External Regenerative Resistors
(2) Specifications of Built-in Regenerative Resistor
If the amount of regenerative energy exceeds the processing capacity of the SERVOPACK, then install an exter-
nal regenerative resistor. The following table shows the specifications of the SERVOPACK’s built-in resistor and
the amount of regenerative power (average values) that it can process.
* The average regenerative power that can be handled is 20% of the rated capacity of the regenerative
resistor built into the SERVOPACK.
SERVOPACK
Capacity
Necessity of External Regenerative Resistors
400 W or less
No built-in regenerative resistor is provided, however, normally an external regenerative resistor
is not required.
Install external regenerative resistors when the smoothing capacitor in SERVOPACK cannot
process all the regenerative power.
750 W to 3.0 kW
A built-in regenerative resistor is provided as standard. Install external regenerative resistors
when the built-in regenerative resistor cannot process all the regenerative power.
Main Circuit
Power Supply
SERVOPACK Model
Specifications
of Built-in Resistor
Regenerative
Power Processed
by Built-in Resistor
∗
(W)
Minimum
Allowable
Resistance
(
Ω
)
Capacity
(kW)
SGDS-
Resistance
(
Ω
)
Capacity
(W)
Single-phase
100 V
0.05
A5F
−
−
−
40
0.10
01F
0.20
02F
0.40
04F
Single-phase
200 V
0.05
A5A
−
−
−
0.10
01A
0.20
02A
0.40
04A
0.75
08A
50
60
12
Three-phase
200 V
1.0
10A
1.5
15A
20
50
10
20
2.0
20A
12
80
16
12
3.0
30A
SIEPS80000025.book 20 ページ ２００４年１０月２５日 月曜日 午前１１時５７分
