Dead Time Compensation; Display Setting - gefran AGy-EV Series Instruction Manual

Dead Time Compensation

The "dead time compensation" function allows for compensation of the output voltage distorsion due to IGBT voltage
drop and its switching characteristics.
Distorsion of output voltage may cause non uniform, non smooth shaft rotation in open loop control.
It is possible to set a voltage value and the compensation variation, called Gradient, through the following parameters.
P.560 Deadtime cmp lev (Dead time compensation level)
Dead time compensation level.
P.561 Deadtime cmp slp (Dead time compensation slope)
Compensation gradient value.
Code LCD display
P .560 Deadtime cmp lev
P .561 Deadtime cmp slp

Display Setting

P.580 Startup display
It is possible to define the first parameter that will be displayed at every power-on of the drive.
The choice can be carried out by setting the corresponding "IPA", reported in the parameters list table, into this
parameter.
P.600 Speed dsply fact (Speed display factor)
Costant used to convert frequencies to speeds.
The parameters is applied to the variable reported in the chapter DISPLAY, sections Basic and Encoder.
Code LCD display
P .580 Startup display
P .600 Speed dsply fact
AGy-EV Instruction manual
v
Output voltage
+
Figure 7.6.18: Dead Time Compensation
[Code] & LCD select.
[Code] & LCD select.
Dead time slope
Dead time level
i
+
Voltage cmd to pwr
Default MIN
(*) 0
(*) 0
Default MIN
1 1
1 0.01
MAX Unit Variation
255
255
MAX Unit Variation
1999
99.99 0.01
Chapter 7 - Parameters Description • 179
IPA
486
487
IPA
488
489