GEFRAN-SIEI ARTDrive Vector V2 Series - Page 73

ARTDrive V2 series - Instruction Manual Chapter 4 Wiring Procedure • 73
η
m
: motor rated efficiency
- at no load, it depends on the iron losses, on mechanical losses, and stator
joule losses. The sum of these terms is about 50% of the full load losses.
Full load losses P
lfl
are:
P
lfl
P
m
1-h
m
h
m
=
Maximum power supply drop out time (Buffer time/voltage failure buffer) of
ARTDrive is achieved by adding the maximum recommended capacitance to
the DC bus.
The following table show the maximum power supply drop out time for different
Undervoltage thresholds and inverter sizes. The meaning of the symbols in the
colums is as follows:
C
std
= internal capacitance in μF,
C
ext
max = external total capacitance in μF,
T
buff
= max drop out time in sec.,
P
SMPS
= power supply watts,
U
buff
= volts threshold to disable drive operation,
U
min
= min DC volts that will support the power supply
Where T
buff
is defined by the formula:
T
buff
(C +
std
C max) (U - U )
ext buff min
22
2P 10
SMPS
6
=
Table 4.10.1: Drive Trip Times, 230-V Threshold
Size Psmps [W] C
std
[µF] C
ext
max [µF] U
buff
[V] U
min
[V] T
buff
[sec.]
4220 70
1800
4500 230 200
0.58
4300 70
2200
4500 230 200
0.62
4370 70
3300
4500 230 200
0.72
5450 70 4950 4500 230 200
0.87
5550 70 4950 4500 230 200 0.87
6750 70 6600 0 230 200 0.61
7900 70 6600 0 230 200
0.61
71100 70
9900
0 230 200
0.91
71320 70 14100 0 230 200 1.3
81600 70 14100 0 230 200 1.3
avy4225