U/F-Characteristic; Corner Speed / Field Weakening (Dr.19); Boost (Ds.11); Output Voltage Stabilization (Ds.10) - KEB COMBIVERT F4-F Applications Manual

Functional Description

6.5.5 U/f-Characteristic

Fig. 6.5.5

U/f-characteristic

Output voltage stabilization dS.10
6.5.6 Corner Speed /
Field Weakening
(dr.19)

6.5.7 Boost (dS.11)

6.5.8 Output Voltage
Stabilization
(dS.10)
Chapter Section Page
6 5 6
The voltage/frequency characteristic (U/f) is defined through following parameters:
• Rated motor frequency (dr.3)
• Rated motor voltage (dr.12)
• Boost (dS.11)
• Corner speed field weakening (dr.19)
• Output voltage stabilization (dS.10) or
max. output voltage
Rated motor voltage dr.12
Boost dS.11
The corner speed defines the speed at which the field weakening range starts.
In controlled operation the boost defines the output speed at 0 Hz. The adjustment is
done in percent related to the value of the output voltage stabilization set in dS.10.
The boost is effective in controlled operation only.
Fluctuations of the system voltage or of the load can cause the DC-link voltage to
change and with it the directly dependent output voltage. At activated output voltage
stabilization the fluctuations of the output voltage are balanced. This functions also
allows the adaption of motors with a smaller rated voltage to the inverter.
In controlled operation this function provides an optimal limit torque characteristic, if
the adjusted value corresponds to the inverter input voltage. At deactivated function
the limit characteristic is calculated to inverter nominal voltage.
Date Name: Basis
KEB COMBIVERT F4-F
11.05.99
Motor Data and Controller Adjustment
U
dr.3
Rated motor frequency
dr.19: Corner speed field weakening
PPZ: Pole pair no. (4-pole motor > 2 pole pairs)
©
f
dr.19 x PPZ
60
KEB Antriebstechnik, 1999
All Rights reserved