Table 3-28 Voltage Boost; Voltage Boost - Siemens MICROMASTER 420 Operating Instructions Manual

Issue 07/04
3.21.1.1

Voltage boost

Parameter range:
Warnings
Faults
Function chart number:
For low output frequencies, the V/f characteristics only output a low output voltage.
Even at low frequencies, the ohmic resistances of the stator winding play a role,
which are neglected when determining the motor flux in Section 3.21.1. This means
that the output voltage can be too low in order to
implement the magnetization of an induction motor,
to hold the load
to voltage drops (ohmic losses in the winding resistances) in the system or
to provide a breakaway / accelerating / braking torque.
The output voltage can be increased (boosted) in MICROMASTER using the
following parameters (refer to Table 3-28):
Table 3-28
Parameter
P1310
P1311
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
P1310, P1311, P1312
r0056 bit 05
-
-
FP6100
Voltage boost
Voltage boost
Constant
voltage boost
V
Boost voltage
Vmax
Vn
(P0304)
actual V
Boost
V
ConBoost,100
V
ConBoost,50
0 f
Boost,end
(P1316)
\\erlf305a\Graphics_PLI\Images\p1310_linear_MM420.vsd
Voltage boost when
accelerating- / braking
Explanation
The voltage boost is effective over the complete
frequency range whereby the value continually
decreases at high frequencies.
Linear V/f
Validity range
ON
OFF
f
P1310 active
1
0
f
fn f max
(P0310) (P1082)
The voltage boost is only effective when accelerating
or braking.
3 Functions
t
t
t
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