Emotron VS10 - User-Definable V;F Characteristic

132 01-6203-01R3, CG Drives & Automation
7.2.1.3. User-definable V/f characteristic
The user-definable V/f characteristic is based on the linear V/f characteristic. An additional
medium characteristic point, however, enables the adaptation to applications with special
torque properties.
Details
An application case for this characteristic shape are applications that require a higher
torque at lower speeds. The additional medium characteristic point can be then
configured in such a way that more voltage is provided in the lower frequency range of
the characteristic. Otherwise, the same limits apply for the adaptive characteristic as for
the linear characteristic.
Select V/f characteristic control with adaptive characteristic:
1. Motor control mode 0x2C00 (P300.00) = "V/f characteristic control (VFC open loop)
[6]"
2. V/f characteristic shape 0x2B00 (P302.00) = "Multipoint [2]"
Setting of the V/f characteristic:
• Limiting factors for the V/f characteristic are rated mains voltage 0x2540:001
(P208.01), minimum frequency 0x2915 (P210.00) and maximum frequency 0x2916
(P211.00).
• The base voltage 0x2B01:001 (P303.01) is usually set to the rated motor voltage
(motor nameplate data). The base voltage is preset to the rated mains voltage. This
again is preset according to the product key of the inverter. Mains voltage  117
• The base frequency 0x2B01:002 (P303.02) is usually set to the rated motor frequency
(motor nameplate data).
• The additional medium characteristic point is defined based on the parameters
0x2B01:003 (P303.03) and 0x2B01:004 (P303.04).
Characteristic examples:
• Example on the left: Base voltage is set equal to rated mains voltage
• Example on the right: Base voltage s set lower than rated mains voltage
Parameter
Name / value range / [default setting]
Info
0x2B01:003
(P303.03)
V/f shape data: Midpoint voltage (V/f shape data:
Midpoint voltage) 0 ... [0] ... 5000 V
• From version 03.00
Definition of the medium characteristic point for user-definable V/f
characteristic.
• Only relevant if V/f characteristic shape 0x2B00 (P302.00) is set =
"Multipoint [2]".
0x2B01:004
(P303.04)
V/f shape data: Midpoint frequency (V/f shape data:
Midpoint freq)
0 ... [0] ... 1500 Hz
• From version 03.00
Next steps
•
The inverter provides different functions by means of which the drive behaviour can be
further optimised.  Optimisation of motor control  122
• A optimisation of the control loops is not mandatory for this motor control type but
may
lead to a better control mode.  Optimisation of the control loops  133