12-13-6
Chapter 12
Inverter Function
12.13.4
Controlling output to avoid
overvoltage
• Overvoltage error is generated when the motor is
decelerated.
• I want to decelerate the motor by automatically
increasing the output voltage according to the
regenerative energy during deceleration.
• I want to prevent overvoltage error by increasing
the output voltage when regenerative load is
applied.
• [bA146] overexcitation function selection allows
you to enable the overexcitation function.
Parameters
• When this function is enabled, the current may
increase as the output voltage increases.
• When using this function, the motor will be
overexcited and the heat generated by the motor
may increase.
• Depending on the deceleration rate or load status,
the overvoltage tripping may be triggered even if
this function is enabled.
• The overexcitation function is activated when
controlling VC characteristics of V/f control, VP
characteristics, and free V/f control.
• The overexcitation function increases the motor
loss and reduces energy to be regenerated in order
to suppress the overvoltage and prevent tripping.
Item
Parameter
Data
Description
Overexcitation function
selection
[bA146]
00
Disabled
01
Always active
02
Active only during deceleration
03
Level operation
04
Level operation during deceleration
Overexcitation output
filter time constant
[bA147]
0.00~1.00(s)
Filter time constant applied to the
overexcitation output.
Overexcitation voltage
gain
[bA148]
50~400(%)
Gain for the overexcitation output voltage.
Overexcitation
suppression level
[bA149]
200 V class: 330.0 - 400.0
(V)
400 V class: 660.0 - 800.0
(V)
The level at which the overexcitation function
starts its operation.
Q
A
!
Содержание SJ Series
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