Simphoenix V800 Series - Page 138

130
Description Of Specific Functions
V800 Series High Performance Closed-Loop Vector Inverter User Manual
F1.4.43 Overvoltage trip level (DC
BUS)
Setting range: 720~800V
Factory default: 740
F1.4.44 Overvoltage adjusting gain
Setting range: 0.10~10.00
Factory default: 1.00
When the motor is dragging overvoltage or in process of deceleration stop with large inertia, it may access
into recycle braking state, causing rapid rise of direct current bus voltage of frequency inverter, leading to
overvoltage protection action. When frequency inverter detects the direct current bus voltage exceeds
[F1.4.43], it will adjust output frequency (extended deceleration time or increase frequency), to ensure
continually safe running.
F1.4.45 Undervoltage trip level (AC
input)
Setting range:
[FF.2.35]~480V
Factory default: 400
F1.4.46 Undervoltage trip level gain
Setting range: 0.10~10.00
Factory default: 1.00
When frequency inverter detects the direct current bus voltage is below [F1.4.45], it may lower output
frequency automatically, accessing into recycle braking state, keep running with mechanical energy. The
larger the undervoltage adjusting gain is, the stronger undervoltage suppression is.
This function plays very efficiently in large inertia load application occasions like centrifugal pump and
draught fan.
Figure 7-31-B Overvoltage
suppression during deceleration process
减速时间
不清除命令
手动恢
复命令
自动清
除命令
加速时间
减速停机
自由停机
电机状态
运行命令
运行允许
启动允许
Figure 7-31-A Overvoltage
suppression during steady running
 The larger the overvoltage adjusting gain is, the more obvious the suppression is, but it
may lead to unsteady running.