Fig. 3-25 V/F Characteristic - Siemens MICROMASTER 440 Operating Instructions Manual

3 Functions
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-
proportionally. This is the reason that above this frequency, the thermal motor
torque should be reduced.
For the quick commissioning, the rating plate data for the delta circuit
configuration should be entered or the rating plate must be appropriately
converted.
The drive 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 both for V/f control as well as for closed-loop vector control.
When using the 87 Hz characteristic, the mechanical motor limits must be taken
into account (refer to Catalog M11).
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:
U
U
N1
(400 V)
U
N∆
(230 V)
Fig. 3-25
Table 3-8
P0304 Rated motor voltage
P0305 Rated motor current
P0307 Rated motor power
P0308
Cos ϕ
P0310 Rated motor frequency
P0311 Rated motor speed
P0314 Motor pole pairs
Contrary to the BOP, AOP operator panels or the commissioning program Drive-
Monitor, the STARTER commissioning (start-up) program offers a mask-orientated
quick commissioning, which is especially advantageous for users who are using
MICROMASTER for the first time. On the other hand, BOP, AOP and DriveMonitor
offer, in conjunction with the drive inverter, parameter-orientated quick commissio-
ning where the user is navigated through the menu tree mentioned.
82
f
f (50 Hz) (87 Hz)
N∆ N1
V/f characteristic
Example 1LA7060-4AB10
configuration
N∆, motor
U
N1
= ⋅
P P
N1 N∆
U
N∆
U
N1
= ⋅
f f
N1 N∆
U
N∆
⎡ ⎤
s
60
⎢ ⎥
min
⎣ ⎦
(
=
n
f
N1
N1
p
f
Delta circuit 87 Hz
characteristic
230 V 400 V
0.73 A 0.73 A
120 W 207 W
0.75 0.75
50 Hz 87 Hz
1350 RPM 2460 RPM
2 2
MICROMASTER 440
Issue 10/06
= 230 V) is fed from a
P = power
f = frequency
n = speed
p = pole pair No.
)
− +
n
f
N∆ ∆
Star circuit
configuration
400 V
0.42 A
120 W
0.75
50 Hz
1350 RPM
2
Operating Instructions
6SE6400-5AW00-0BP0