Demagnetization Time; Stator Resistance (Line-To-Line) - Siemens MICROMASTER 440 Parameter Manual

Issue 01/06
P0347[3]

Demagnetization time

CStat: CUT
P-Group: MOTOR
Defines the de-magnetization time for the connected induction motor.
The de-magnetization time is the time that must expire between powering-down the drive (OFF2 or a drive
inverter fault/error) and powering-up again. The drive inverter is prevented from being powered-up again
within this time interval. The flux in the induction motor is reduced to a low value during this de-
magnetization time.
ON
OFF1
OFF2
inactive
active
f
Index:
P0347[0] : 1st. Drive data set (DDS)
P0347[1] : 2nd. Drive data set (DDS)
P0347[2] : 3rd. Drive data set (DDS)
Note:
- The de-magnetization time is approximately 250% of the rotor time constant (r0384) in seconds.
- The pre-assignment (default value) depends on the drive inverter type and its rated/nominal values.
- It is not active after a normal ramp-down - i.e. after OFF1 or OFF3.
- If this time is excessively shortened, then the drive inverter will be tripped (shut down) due to an
overcurrent condition.
- If a synchronous motor is connected, the de-magnetization time should be set to 0.
P0350[3]

Stator resistance (line-to-line)

CStat: CUT
P-Group: MOTOR
Stator resistance value in [Ohms] for connected motor (from line-to-line). The parameter value includes the
cable resistance.
= ⋅
P 0350 2 ( R
There are three ways to determine the value for this parameter:
1. Calculate using
- P0340 = 1 (data entered from rating plate) or
- P0010 = 1, P3900 = 1,2 or 3 (end of quick commissioning).
2. Measure using P1910 = 1 (motor data identification - value for stator resistance is overwritten).
3. Measure manually using an Ohmmeter.
Index:
P0350[0] : 1st. Drive data set (DDS)
P0350[1] : 2nd. Drive data set (DDS)
P0350[2] : 3rd. Drive data set (DDS)
Note:
- Since measured line-to-line, this value may appear to be higher (up to 2 times higher) than expected.
- The value entered in P0350 (stator resistance) is the one obtained by the method last used.
- Default value is depending on inverter type and its rating data.
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0
Datatype: Float
Active: Immediately
OFF2
Motor coasts down
P0347
Datatype: Float
Active: Immediately
+
R )
Cable S
Parameter Description
Min: 0.000
Unit: s Def: 1.000
QuickComm.: No Max: 20.000
Min: 0.00001
Unit: Ohm Def: 4.00000
QuickComm.: No Max: 2000.00000
Level
3
t
t
t
Level
2
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