Siemens MICROMASTER 440 - Fig. 3-25 V;F Characteristic

3 Functions Issue 10/06
MICROMASTER 440 Operating Instructions
82 6SE6400-5AW00-0BP0
87 Hz characteristic
When a motor with a delta circuit configuration (e. g. V
N∆, motor
= 230 V) is fed from a
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:
¾ The motor must have the appropriate voltage strength.
¾ 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.
¾ For the quick commissioning, the rating plate data for the delta circuit
configuration should be entered or the rating plate must be appropriately
converted.
¾ The drive inverter must be designed for the higher current (delta circuit
configuration).
¾ 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.
¾ 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:
P = power
P
U
U
P
N∆
N∆
N1
N1
⋅=
f
U
U
f
N∆
N∆
N1
N1
⋅=
()
n
ff
n
∆
N∆N1
N1
p
min
s
60
+−
⎥
⎦
⎤
⎢
⎣
⎡
=
f
f
N1
f
N∆
U
U
N∆
U
N1
f = frequency
n = speed
p = pole pair No.
(400 V)
(230 V)
(50 Hz) (87 Hz)
Fig. 3-25 V/f characteristic
Table 3-8 Example 1LA7060-4AB10
Delta circuit
configuration
87 Hz
characteristic
Star circuit
configuration
P0304 Rated motor voltage 230 V 400 V 400 V
P0305 Rated motor current 0.73 A 0.73 A 0.42 A
P0307 Rated motor power 120 W 207 W 120 W
P0308
Cos ϕ
0.75 0.75 0.75
P0310 Rated motor frequency 50 Hz 87 Hz 50 Hz
P0311 Rated motor speed 1350 RPM 2460 RPM 1350 RPM
P0314 Motor pole pairs 2 2 2
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.