Infranor XtrapulsGem User Manual

13
X
trapulsPac - User Guide
Chapter 2 – Commissioning
The maximum current duration before release of the warning is depending on the value of the parameters Rated
current and Max. current. This value is calculated as follows:
T
dyn
(second) = t
1
-t
0
= 3,3 x [rated current (A) / max. current (A)]
2
(shaft locked conditions)
T
dyn
(second) = t
1
-t
0
= 10 x [rated current (A) / max. current (A)]
2
(motor running with current frequency value
higher than 2 Hz)
The maximum current duration before limitation at the rated current is also depending on the value of the Rated
current and Max. current parameters. This value is calculated as follows:
T
max
(second) = t
2
-t
0
= 4 x [rated current (A) / max. current (A)]
2
(shaft locked conditions)
T
max
(second) = t
2
-t
0
= 12 x [rated current (A) / max. current (A)]
2
(motor running with current frequency value
higher than 2 Hz)
NOTE
When the "Max. current / Rated current" ratio is close to 1, the Tdyn and Tmax values given by the formula above
are quite below the real values. But this formula remains very precise as long as the "Max. current / Rated
current" ratio is higher than 3/2.
Operation of the Current Limitation in "Limiting" Mode
When the drive output RMS current (I
2
t) reaches 85 % of the rated current, the I²t warning is displayed. When the
RMS current (I
2
t) drops below 85 % of the rated current, the I²t warning is removed.
When the drive output RMS current (I
2
t) reaches the rated current value, the I
2
t protection limits the drive output
current at this value.
Diagram of the drive output current limitation in an extreme case (motor overloaded or shaft locked):
The maximum current duration before warning (t1 - t0) and before limitation at the rated current (t2 - t0) is
calculated the same way as in the "Fusing" mode.
Speed limit adjustment
The Maximum speed parameter defines the speed limit of the motor. This value is given in the motor catalog
according to the rated supply voltage and the rated load conditions. If the drive output voltage is lower than the
motor rated voltage value, the Maximum speed must be reduced accordingly.
The maximum value for the speed set point in the application must be adjusted in order to get a motor speed
value lower than the Maximum speed parameter. A margin of 10 % to 20 % is recommended.
Current loop adjustment
Enter the value of the total phase-to-phase inductance connected to the drive (motor internal winding
inductance + external filtering inductance if used).
Select the current loop Bandwidth:
- The High bandwidth selection will give a high current loop gain values suitable for running high speed multi-
pole motors (up to 900 Hz motor current frequency). Furthermore, the speed loop bandwidth can also be set
high because the internal current loop delay is minimized. This is the default current loop bandwidth value.
- The Low bandwidth selection will introduce a low pass filter in the drive current measurement in order to
significantly reduce the audible whistling noise with some motor technologies. In this case, the max. motor
current frequency is limited at 400 Hz. The “Low bandwidth” choice for the current loop will also introduce a
Drive output current
Max. current
Rated current
time
0
t1 = Warning
t2 = Current limitation
1

Infranor XtrapulsGem Specifications

General

Brand	Infranor
Model	XtrapulsGem
Category	Controller
Language	English