Parameter descriptions
1 -
Magnetisation
In this operation mode, the Current during flux-formation 781 for mag-
netization is impressed into the motor after enable. The output frequen-
cy is kept at zero Hz not exceeding the
Maximum flux-formation time
780. After this time has expired (at the latest), the output frequency
follows the adjusted V/f characteristic.
2 -
Magnetisation +
current impression
Operation mode 2 includes operation mode 1. After the Maximum flux-
formation time 780 has elapsed (at the latest), the output frequency is
increased according to the set acceleration and the starting current is
impressed. If the output frequency reaches the value set with the pa-
rameter
Frequency limit 624, the Starting current 623 is withdrawn.
There is a smooth transition to 1.4 times the frequency limit to the set
V/f characteristic. As from this operating point, the output current de-
pends on the load. Factory setting.
3 -
Magnetisation +
IxR-compensation
Operation mode 3 includes operation mode 1. When the output frequen-
cy reaches the value set with parameter Frequency limit 624, the in-
crease of the output voltage by the IxR compensation becomes ef-
fec-tive. The V/f characteristic is displaced by the portion of voltage
which depends on the stator resistance.
4 -
Magnetisation +
current impression
+ IxR-
compensation
In this operation mode, the current set with the parameter Current dur-
ing flux-formation 781 is impressed into the motor for magnetization
after enable. The output frequency is kept at zero Hz not exceeding the
Maximum flux-formation time 780. After the time has elapsed (at the
latest), the output frequency is increased according to the set accelera-
tion and the starting current is impressed. If the output frequency
reaches the value set with the parameter
Frequency limit 624, the
Starting current 623 is withdrawn. There is a smooth transition to the
V/f characteristic, and a load-dependent output current is obtained. At
the same time, the increase of the output voltage by the IxR compensa-
tion becomes effective as from this output frequency. The V/f character-
istic is displaced by the portion of voltage which depends on the stator
12 -
Magnetisation +
current impression
with ramp stop
Operation mode 12 contains an additional function to guarantee a start-
ing behavior under difficult conditions. The magnetization and starting
current impression are done according to operation mode 2. The ramp
stop takes the current consumption of the motor at the corresponding
operating point into account and controls the frequency and voltage
change by stopping the ramp. The
Controller status 275 signals the
intervention of the controller by displaying the message “RSTP“.
14 -
Magnetisation +
current impression
with ramp stop +
IxR-compensation
In this operation mode, the functions of operation mode 12 are extend-
ed by the compensation of the volt-age drop across the stator re-
sistance. When the output frequency reaches the value set with parame-
ter
Frequency limit 624, the increase of the output voltage by the IxR
compensation becomes effective. The V/f characteristic is displaced by
the portion of voltage which depends on the stator resistance.
621 Amplification
622 Integral time
In setting Configuration 30 = "110 - IM: sensorless control" (V/f control of asynchronous motor), a
current controller is available for the starting behavior. The PI controller controls the current impres-
sion via parameter
Starting current 623. The proportional and integrating part of the current control-
ler can be set via parameters
Amplification 621 and Integral time 622.
No. Description Min. Max. Fact. sett.
621 Amplification 0.01 10.00 2.00
124
Operating Instructions
Agile
06/2013 Operational Behavior
To Next Page
Loading...
Need help?
General
