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
!
Summary of Contents for SJ Series
Page 39: ...5 4 Chapter 5 Included Items Memo ...
Page 55: ...6 16 Chapter 6 Installation Memo ...
Page 91: ...7 36 Chapter 7 Wire Connection and Optional Devices Memo ...
Page 135: ...9 40 Chapter 9 Operating Instructions Memo ...
Page 145: ...10 10 Chapter 10 Test Run Memo ...
Page 159: ...12 2 6 Chapter 12 Inverter Functions Memo ...
Page 169: ...12 3 10 Chapter 12 Inverter Functions Memo ...
Page 195: ...12 5 8 Chapter 12 Inverter Functions Memo ...
Page 217: ...12 8 12 Chapter 12 Inverter Function Memo ...
Page 287: ...12 10 32 Chapter 12 Inverter Functions Memo ...
Page 303: ...12 11 16 Chapter 12 Inverter Functions Memo ...
Page 349: ...12 15 8 Chapter 12 Inverter Function Memo ...
Page 395: ...12 17 34 Chapter 12 Inverter Functions Memo ...
Page 397: ...12 18 2 Chapter 12 Inverter Functions Memo ...
Page 415: ...12 19 18 Chapter 12 Inverter Function Memo ...
Page 581: ...15 10 Chapter 15 Optional Cassettes Memo ...
Page 591: ...16 10 Chapter 16 ProDriveNext EzSQ Memo ...
Page 642: ...18 49 Chapter 18 Tips FAQ Troubleshooting Memo ...
Page 650: ...19 8 Chapter 19 Maintenance and Inspection Memo ...
Page 781: ...Appendix 1 70 Appendix 1 List of Parameters Memo ...