Siemens MICROMASTER 440 Operating Instructions Manual page 93

Issue 10/06
NOTE
The equivalent circuit data (P0350, P0354, P0356, P0358, P0360), with the
exception of parameter P0350, should be entered as phase values. In this case,
parameter P0350 (line-to-line value) corresponds to twice the phase value.
Equivalent circuit diagram data always refer to the star circuit configuration
equivalent circuit diagram data. If data for the delta equivalent circuit diagram is
available, then this data must be converted into the star equivalent circuit
diagram data before being entered (refer to Section 0).
The motor cable resistance P0352 is defined as phase value
During the motor identification routine, the stator resistance and the motor cable
resistance are determined and entered into parameter P0350. If a correction is
made in parameter P0352, then MICROMASTER defines the motor cable
resistance using the following relationship: P0352 = 0.2 * P0350.
If the motor cable resistance is known, then the value can be entered into
parameter P0352 after the motor data identification. The stator resistance is
appropriately reduced as a result of this entry and is therefore more precisely
adapted to the actual application.
It is not necessary to lock the motor rotor for the motor data identification
routine. However, if it is possible to lock the motor rotor during the identification
routine (e.g. by closing the motor holding brake), then this should be used to
determine the equivalent circuit diagram data.
The following formula can be applied to check the correctness of the motor
rating plate data:
= √ 3 ∗ V
P
N
with
V
N Υ
I
N Υ
cos ϕ
η
Motor data identification routine
START
P0625 = ?
| Motor temp. - P0625|
≤ 5 °C ?
yes no
Allow the motor
to cool down
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
∗ I ∗ cos ϕ ∗ η ≈ √ 3 ∗ V
N Υ NΥ
P rated motor power
N
, V rated motor voltage (star / delta)
N ∆
, I rated motor current (star / delta)
N ∆
power factor
efficiency
Ambient motor temperature ( entered in °C)
The motor ambient temperature is entered at the instant that motor data is
being determined (factory setting: 20 °C ).
The difference between the motor temperature and the motor ambient
temperature P0625 must lie in the tolerance range of approx. ± 5 °C. If this is
not the case, then the motor data identification routine can only be carried-out
after the motor has cooled down.
∗ I ∗ cos ϕ ∗ η
N ∆ N∆
3 Functions
Factory setting
20 °C
93