Siemens 440 - Manual (Page 137)

Issue 01/06 Parameter Description
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0
137
P1202[3] Motor-current: Flying start Min: 10
CStat: CUT Datatype: U16 Unit: % Def: 100
P-Group: FUNC Active: first confirm QuickComm.: No Max: 200
Defines search current used for flying start. Value is in [%] based on rated motor current (P0305).
Index:
P1202[0] : 1st. Drive data set (DDS)
P1202[1] : 2nd. Drive data set (DDS)
P1202[2] : 3rd. Drive data set (DDS)
Note:
- If the search current is reduced, the flying restart behavior can be improved if the system inertia is not
very high.
-
The search algorithm for the flying restart is different for V/f control and closed-loop vector control.
- This is the reason that, depending on the control technique, parameter P1202 must be appropriately
adapted.
- Values gained from experience indicate that good results can be achieved by
-
Increasing P1202 for V/f controls
- Reducing P1202 for closed-loop vector controls
P1203[3] Search rate: Flying start Min: 10
CStat: CUT Datatype: U16 Unit: % Def: 100
P-Group: FUNC Active: first confirm QuickComm.: No Max: 200
Sets factor by which the output frequency changes during flying start to synchronize with turning motor. This
value is entered in [%] defines the reciprocal initial gradient in the search sequence (see curve below).
Parameter P1203 influences the time taken to search for the motor frequency.
The search time is the time taken to search through all frequencies between max. frequency P1082 + 2 x
f_slip to 0 Hz.
f motor
t
1 ms
0310 P
100
r0330
[%] P1203
[%] 2
= f [%] 2
[ms] 1
[Hz] f
[Hz] f
[ms] t
[%] P1203
nom slip, ⋅ ⋅ ∆ ⇒ ⋅ ⋅
∆
∆
=
f search ∆ f
P0310
100
r0330
2 P1082 f 2 + f nom slip, max
⋅ ⋅ + =
P1203 = 100 % is defined as giving a rate of 2 % of f_slip,nom / [ms].
P1203 = 200 % would result in a rate of frequency change of 1 % of f_slip,nom / [ms].
Index:
P1203[0] : 1st. Drive data set (DDS)
P1203[1] : 2nd. Drive data set (DDS)
P1203[2] : 3rd. Drive data set (DDS)
Example:
For a motor with 50 Hz, 1350 rpm, 100 % would produce a maximum search time of 600 ms. If the motor is
turning, the motor frequency is found in a shorter time.
Note:
- A higher value produces a flatter gradient and thus a longer search time.
- A lower value has the opposite effect.
-
For closed-loop vector control, parameter P1203 is de-activated
Level
3
Level
3