Siemens MICROMASTER 440 - Fig. 3-24 Star; Delta Circuit Configurations

Issue 10/06 3 Functions
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
81
The following must be noted when entering the rating plate data or the ESB data:
¾ The outer conductor voltage/phase-to-phase voltage (voltage U
12
between outer
conductors L1, L2) and the outer conductor current (phase current) I
1
are
always specified on the rating plate.
¾ The rated motor voltage P0304 and the rated motor current P0305 must always
be entered according to the motor circuit configuration (either delta/star circuit
configuration).
¾ If rated motor data that are available (P0304, P0305) are not consistent with the
motor circuit configuration, then an appropriate conversion should be made
which is then entered.
¾ If equivalent circuit diagram data (P0350, P0354, P0356, P0358, P0360) is
available, then these should be entered according to the motor circuit
configuration. If there is no consistency between the motor circuit configuration
and equivalent circuit diagram data, then the equivalent circuit diagram data
should be converted and entered corresponding to the data on the rating plate
(P0304, P0305).
I
1
1
2
U
12
3
U
1N
I
1N
Z
N
ZZ
III
321
==
U 3
UUU
1Ν
312312
⋅
===
Z2
I
U
1
12
⋅=
3
Z
Z
Y12,
∆12,
=
U
3
U
Y12,
1
∆12,
=
I
1
1
2
U
12
3
I
12
ZZ
Z
I
3
1
III
1312312
⋅===
UUU
312312
==
I
3
1
I
Y1,∆1,
=
Z
3
2
I
U
1
12
⋅=
Fig. 3-24 Star / delta circuit configurations
NOTE
The precise equivalent circuit diagram data are of extreme important regarding the
stability of the closed-loop vector control and for the voltage boost applied to the
V/f characteristic. Equivalent circuit diagram data can only be estimated from the
rating plate data; this is the reason that equivalent circuit diagram data is either
determined
- using the motor data identification (refer to Chapter 0), or
- is entered from a motor data sheet that may be available (refer to Chapter 0).
NOTE
The MICROMASTER series of drive units is not available for 3-ph. 690 V AC.