6 Wiring
6.5.1 Regenerative Power and Regenerative Resistance
6-30
6.5 Connecting Regenerative Resistors
6.5.1 Regenerative Power and Regenerative Resistance
The rotational energy of driven machine such as servomotor is returned to the SERVOPACK. This is called
regenerative power. The regenerative power is absorbed by charging the smoothing capacitor, but when the
power exceeds the capacitor’s chargeable energy, the regenerative power is further consumed by the regenerative
resistor.
The servomotor is driven in regeneration state in the following circumstances:
• While decelerating to a stop during acceleration and deceleration operation.
• Continuous falling operation 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 30 to 400 W or 100 V with 30 to 200 W do
not have built-in regenerative resistors. If the operation exceeds the rotating speed specifications shown in the
4.5.3 Load Moment of Inertia, connect an external regenerative resistor.
6.5.2 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.
* 1. The average regenerative power that can be handled is 20% of the rated capacity of the regenerative
resistor built into the SERVOPACK.
* 2. The values in parentheses are for the optional JUSP-RA04 Regenerative Resistor Unit.
* 3. The values in parentheses are for the optional JUSP-RA05 Regenerative Resistor Unit.
SERVOPACK
Capacity
Necessity of
External Regen-
erative Resistors
Explanation
400 W or less
Not Required
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 SER-
VOPACK cannot process all the regenerative power.
500 W to 5.0 kW
Not Required
A built-in regenerative resistor is provided as standard. Install external regen-
erative resistors when the built-in regenerative resistor cannot process all the
regenerative power.
6.0 to 15.0 kW
Required
No built-in regenerative resistor is provided, so the external regenerative
resistor is required. If the external regenerative resistor is not connected with
the SERVOPACK, the alarm30 is detected as a regeneration error alarm.
Applicable SERVOPACKs
SGDM-
Specifications
of Build-in Resistor
Regenerative Power
Processed by Built-in
Resistor
∗1
(W)
Minimum
Allowable
Resistance
(Ω)
Resistance
(Ω)
Capacity
(W)
Single-phase
100 V
A3BD to -02BD,
A3BDA to -02BDA
−− − 40
Single-phase
200 V
A3AD to -04AD,
A3ADA to -04ADA
−− − 40
Three-phase
200 V
05AD to -10AD,
05ADA to -10ADA
50 60 12 40
15AD, 15ADA
30 70 14 20
20AD, 20ADA
25 140 28 12
30AD, 30ADA
12.5 140 28 12
50ADA
8 280 56 8
60ADA
(6.25)
∗2
(880)
∗2
(180)
∗2
5.8
75ADA to -1EADA
(3.13)
∗3
(1760)
∗3
(350)
∗3
2.9
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