5-24
5-4 Regenerative Resistor Setting
- SV Series User’s Manual -
COMMON PARAMETER SETTING
• When a regenerative resistor other than OP-84399/OP-87073 is used, an external regenerative resistor
with a thermostat is recommended to ensure safety.
• If you set SYS_04 to 0 when an external regenerative resistor is connected, it is possibe that the
"Regenerative overload" alarm (320) cannot be detected. When it cannot be detected normally, personal
injury or fire may result. Therefore, be sure to set it to a proper value.
Default of the regenerative resistor capacity is 0, which is the set value when the regenerative resistor is
not connected (when SV-075 □ 2/100 □ 2/200 □2/300 □2/500 □ 2 only uses a built-in regenerative
resistor). When an external regenerative resistor is not connected, if you set SYS_04 a value other than 0,
the "Regenerative error" alarm (300) will occur.
How to Select An External Regenerative Resistor
When a regenerative resistor other than the external regenerative resistor option (OP-84399/OP-87073) is used,
capacity of the regenerative resistor can be determined through the following steps.
For specification of the regenerative resistor, be sure to check ratings of the regenerative resistor before use.
■
Determine whether an external regenerative resistor is needed based on simple calculation
When driving a servo motor on a horizontal axis, you can use the following simple formula to determine whether an
external regenerative resistor is required.
● When the servo amplifier does not have a built-in regenerative resistor (below 400W)
The energy that can be handled by the capacitor is shown below.
When rotating energy of the servo motor and load exceeds the value in the table, please connect an external
regenerative resistor. Rotating energy Es of the servo motor and load can be calculated using the following formula.
E
S
= J x n
M
2
/182 [J]
E
S
: Energy
J : ( = J
M
+J
L
) [kg·m
2
]
J
M
: Rotor inertia moment of servo motor [kg·m
2
]
J
L
: Ratio of load inertia moment converted based on motor axis [kg·m
2
]
n
M
: Operating speed of servo motor [min
-1
]
Servo amplifier
type
Regenerative energy that can be
handled [J]
Note
SV-005*1
26.4
It is the value when input voltage of the main circuit
power single-phase AC100V
SV-010*1
SV-020*1
SV-040*1 44.1
SV-005*2
24.2
It is the value when input voltage of the main circuit
power single-phase AC200V
SV-010*2
SV-020*2
SV-040*2 31.7
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