Siemens 440 - Manual (Page 158)

Parameter Description Issue 01/06
MICROMASTER 440 Parameter List
158 6SE6400-5BB00-0BP0
P1312[3] Starting boost Min: 0.0
CStat: CUT Datatype: Float Unit: % Def: 0.0
P-Group: CONTROL Active: Immediately QuickComm.: No Max: 250.0
Applies a constant linear offset (in [%] relative to P0305 (rated motor current)) to active V/f curve (either
linear or quadratic) after an ON command and is active until
1) ramp output reaches setpoint for the first time respectively
2) setpoint is reduced to less than present ramp output
This is useful for starting loads with high inertia.
Setting the starting boost (P1312) too high will cause the inverter to limit the current, which will in turn
restrict the output frequency to below the setpoint frequency.
OFF
ON
t
t
 f 
P1312 active
t 0
1
Vmax
Vn
(P0304)
V
StartBoost,100
0 fn
(P0310)
fmax
(P1082)
f
V
f
Boost,end
(P1316)
V
StartBoost,50
Boost
Boost voltage
No
rm
al
V/f
(P
13
00
=
0)
actual V
Ou
tpu
t v
olt
ag
e
Validity range
where voltage values are given
100
P1312
0350 P 0305 P V
100 , StartBoost
⋅ ⋅ =
2
V
V
,100 StartBoost
,50 StartBoost
=
Index:
P1312[0] : 1st. Drive data set (DDS)
P1312[1] : 2nd. Drive data set (DDS)
P1312[2] : 3rd. Drive data set (DDS)
Example:
Setpoint = 50Hz. Ramping up with starting boost. During ramp up, setpoint changed to 20Hz. As soon as
setpoint changed, starting boost removed because setpoint smaller than present ramp output.
Dependency:
Acceleration boost P1312 has no effect during vector operation.
Note:
See parameter P1310
r1315 CO: Total boost voltage Min: -
Datatype: Float Unit: V Def: -
P-Group: CONTROL Max: -
Displays total value of voltage boost (in volts).
Level
2
Level
4