Siemens SINAMICS G120 Hardware Installation Manual page 34

Installing/Mounting
4.2 Electrical Installation
87 Hz characteristic
When a motor with a delta circuit configuration (e.g. V
frequency inverter, where the rated voltage corresponds to the star circuit configuration (e.g.
400 V frequency inverter), then it is important to proceed as follows and observe the
following:
• The motor must have the appropriate voltage strength.
• Above the rated motor frequency, the iron losses in the motor increase over-
• For the quick commissioning, the rating plate data for the delta circuit configuration
• The inverter must be designed for the higher current (delta circuit configuration).
• The 87 Hz characteristic is independent of the control type and can therefore be used
• When using the 87 Hz characteristic, the mechanical motor limits must be taken into
For the 87 Hz characteristic, the ratio between the voltage and frequency (V/f characteristic)
remain constant. This is the reason that the following relationships apply:
(400 V)
(230 V)
Figure 4-14
Table 4-3
P0304
P0305
P0307
P0308
P0310
P0311
P0314
Contrary to the OP, the STARTER commissioning (start-up) program offers a mask-
orientated quick commissioning. On the other hand, the OP offers, in conjunction with the
inverter, parameter-orientated quick commissioning.
4-16
proportionally. This is the reason that above this frequency, the thermal motor torque
should be reduced.
should be entered or the rating plate must be appropriately converted.
both for V/f control as well as for closed-loop vector control.
account.
U
U
N1
U
N∆
f
(50 Hz)
N∆
V/f characteristic
Example 1LA7060-4AB10
Rated motor voltage
Rated motor current
Rated motor power
cos φ
Rated motor frequency
Rated motor speed
Motor pole pairs
U
= N1
P
N1
U
NΔ
U
= N1 ⋅
f
N1
U
NΔ
⎡
60
⎢
⎣
min
=
n
N1
p
f
f
(87 Hz)
N1
Delta circuit
configuration
230 V
0.73 A
120 W
0.75
50 Hz
1350 RPM
2
Hardware Installation Manual, 2006-04-04, A5E00807525B AA
, motor = 230 V) is fed from a
N∆
⋅
P
NΔ
f
NΔ
⎤
s
⎥
⎦
( )
− +
n
f f
Δ
N1 NΔ
87 Hz
characteristic
400 V
0.73 A
207 W
0.75
87 Hz
2460 RPM
2
Star circuit
configuration
400 V
0.42 A
120 W
0.75
50 Hz
1350 RPM
2
Power Modules PM240