Siemens MICROMASTER 420 - Table 3-28 Voltage Boost; Voltage Boost

Issue 07/04 3 Functions
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
145
3.21.1.1 Voltage boost
Parameter range: P1310, P1311, P1312
r0056 bit 05
Warnings -
Faults -
Function chart number: FP6100
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 Voltage boost
Parameter Voltage boost Explanation
P1310 Constant
voltage boost
The voltage boost is effective over the complete
frequency range whereby the value continually
decreases at high frequencies.
f
Linear V/f
OFF
ON
t
t
f
P1310 active
t0
1
Validity range
Vmax
Vn
(P0304)
V
ConBoost,100
0
fn
(P0310)
f max
(P1082)
V
f
Boost,end
(P1316)
Boost
O
u
t
p
u
t
v
o
l
t
a
g
e
actual V
N
o
r
m
a
l
V
/
f
(
P
1
3
0
0
=
0
)
V
ConBoost,50
Boost voltage
\\erlf305a\Graphics_PLI\Images\p1310_linear_MM420.vsd
P1311 Voltage boost when
accelerating- / braking
The voltage boost is only effective when accelerating
or braking.