Inovance SV660, Руководство для продвинутых пользователей

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5 Commissioning and Operation
☆ Related parameters:
Parameter
No.
Name
Value
Range
Unit Function
Setting
Condition
Effective Time Default
2002h 19h
Resistor heat
dissipation
coefficient
10–100 %
Used to set resistor heat dissipation
coefficient when an external
regenerative resistor is used.
The value cannot be larger than
30% when natural ventilation is
used.
The value cannot be larger than
50% when forced air cooling is
used.
At stop Immediately 30
NOTE
◆
The larger the heat dissipation coefficient is, the better the braking efficiency is.
◆
When P
b
< P
a
and P
b
x T > E
C
, use the built-in regenerative resistor. In this case, set H02-25 to 0.
◆
When P
b
x T ＜ E
C
, no regenerative resistor is required because the bus capacitor is sufficient to
absorb the braking energy. In this case, set 2002-1Ah to 3.
2) External load torque exist and motor staying in generating state
When the motor torque direction is the same with the axis rotating direction, the motor outputs energy
to the outside. In some special applications where the motor torque output is opposite to the rotating
direction, the motor is in power generating status and feeds the electric energy back to the servo drive.
When the load is in continuous power-generating status, it is recommended to adopt the common DC
bus mode.
Motor
speed
External
load
torque
Motor
output
torque
Motor output
( generating )
Motor output
( motoring )
Motor output
( generating )
Motor output
( motoring )
Figure 5-9 Example of the curve under the existence of external load torque
Take the H1 series 750 W model (rated torque 2.39 N·m) as an example. When the external load torque is
60% of the rated torque and the motor speed is 1500 RPM, the power fed back to the servo drive is:
(60% x 2.39) x (1500 x 2π/60) = 225 W. As the regenerative resistor is derated by 70%, the power of the
external regenerative resistor is: 225/(1 - 70%) = 750 W, with resistance being 50 Ω.