V&T E5-H Series User Manual page 98

changed output current below protective motion value, thus ensuring continuous and reliable operation of
system. When current exceeds a certain value (PA.05), the inverter will turn into current limit status.
When running at constant speed, maintain stable load capacity without producing over current error by
current limit. When loads mitigate, exit the current limit status automatically, and return to work properly.
The function is especially applied to applications of suddenly changed speed or load.
Note:
Current limit current PA.05 is proportion of rated current of inverter. When torque load varies:
20.0~150.0%.
Under the current limit status, the speed of motor will decrease. The current limit function is not
appropriate for systems that will not permit reduce speed, for example lifter, otherwise will loss
of control.
PA.06
Unit place: Over−voltage adjustment: When motor with large inertial load stops rapidly, or a short−time
regenerative braking happens for load abrupt changes when the motor is running, DC bus voltage of
inverter will rise, thus may result over−voltage protective motion. The voltage adjustment function in this
case is to decrease the braking torque to control the DC bus voltage to prenvent over voltage alarm
through adjusting output frequency and auto prolonging deceleration time.
Note: If energy−consumption braking is applied and braking unit (PA.09=1) has been set and applied, the
function becomes disabled.
Tens place: Under−voltage adjustment: When power supply voltage decreases or has instantaneous
power failure; DC bus voltage will also decrease.The function of under−voltage adjustment is to
decrease the motor rotating speed through decreasing the output frequency,and the load inertial energy
is fed back to DC side to keep DC voltage higher than the under valtage value to avoid stopping caused
by under voltage. Under voltage function is very effective in applications such as centrifugal pump and
fan.
Hundreds place: Overmodulation: This function is used to increase inverter output voltage and ensure
the inverter output capacity under low grid voltage or heavy load.
Unit place
Tens place
Hundreds place
PA.07
By setting PA07, ensure that output voltage will decrease automatically as the loads decrease under
proper operation. The inverter maximally decreases reactive power to save more energy. Adjust the
parameter according to real load conditions. The greater the parameter setting is, more visible the
energy saving effect achieves, and the longer the response time lasts for the inverter converting from
E5−H High Performance Universal Inverter
Voltage adjustment function
Display of operation panel
Over−voltage adjustment:
0: No action; 1: Action
Under−voltage adjustment:
0: No action; 1: Action
Overmodulation:
0: No action; 1: Action
Energy-saving coefficient
Chapter 6 Parameter Description
User Manual
000 ~ 111(101)
0 ~ 50 %(0%)
91