Reference/Limit Frequencies; Closed-Loop Motor Control - Siemens MICROMASTER 420 Operating Manual

Issue 04/04
6.2.12

Reference/limit frequencies

Min. frequency (entered in Hz)
P1080 =...
Sets minimum motor frequency [Hz] at which motor will run irrespective of frequency
setpoint. If the setpoint falls below the value of P1080, then the output frequency is set to
P1080 taking into account the sign.
Max. frequency (entered in Hz)
P1082 =...
Sets maximum motor frequency [Hz] at which motor will run irrespective of the frequency
setpoint. If the setpoint exceeds the value P1082, then the output frequency is limited. The
value set here is valid for both clockwise and anticlockwise rotation.
Reference frequency (entered in Hz)
P2000 =...
The reference frequency in Hertz corresponds to a value of 100 %. This setting should be
changed if a maximum frequency of higher than 50 Hz is required. It is automatically
changed to 60 Hz if the standard 60 Hz frequency was selected using the DIP50/60 switch
or P0100.
NOTE
This reference frequency effects the setpoint frequency as both the analog setpoints
(100 %
value.
6.2.13

Closed-loop motor control

Control mode
P1300 =...
The closed-loop control type is selected using this parameter. For the "V/f characteristic"
control type, the ratio between the frequency inverter output voltage and the frequency
inverter output frequency is defined.
0 V/f with linear
1 V/f with FCC
2 V/f with parabolic characteristic
V/f with programmable characteristic ( → P1320 – P1325)
3
Continuous boost (entered in %)
P1310 =...
Voltage boost as a % relative to P0305 (rated motor current) and P0350 (stator resistance).
P1310 is valid for all V/f versions (refer to P1300). At low output frequencies, the effective
resistance values of the winding can no longer be neglected in order to maintain the motor
flux.
V
Vmax
Vn
(P0304)
V
ConBoost,100
Acceleration boost (entered in %)
P1311 =...
Voltage boost for accelerating/braking as a % relative to P0305 and P0350. P1311 only
results in a voltage boost when ramping-up/ramp-down and generates an additional torque
for accelerating/braking. Contrary to parameter P1312, that is only active for the 1
acceleration operation after the ON command, P1311 is effective each time that the drive
accelerates or brakes.
MICROMASTER 420
Compact Operating Manual
P2000) as well as the frequency setpoints via USS (4000H
Boost voltage
actual V
Boost
V
ConBoost,50
0 f
Boost,end
(P1316)
Linear V/f
Validity range
ON
OFF
f
P1310 active
1
0
f
fn f max
(P0310) (P1082)
6 Commissioning
0.00 Hz
50.00 Hz
50.00 Hz
P2000) refer to this
0
50.00 %
t
t
t
0.0 %
st
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