Beijer Electronics Frequency Inverter BFI-P2
KI00306B 2020-03
www.beijer.se www.beijer.no www.beijer.dk
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6.1 Vector Control
Flux Vector Control
allows the motor to obtain maximum torque from about 0.5 Hz to the rated
frequency. The motor also receives a constant speed regardless of load and engine temperature.
Flux Vector Control
calculates the load on the motor and speed based on the current motor
current, motor voltage and motor measured characteristic. There are two modes of encoder-less
vector control on the drive,
Vector Speed Control
and
Vector Torque control
.
The mode of operation is set by parameter P4-01:
P4-01 = 0 : Speed Control with Torque Limit (vector)
P4-01 = 1 : Torque Control with Speed Limit (vector)
Use this function to increase available torque on motor shaft or when constant speed is
required.
6.1.1
Speed Control
Speed Control with Torque Limit (vector): P4-01 = 0
In
Vector Speed Control
mode, the reference signal (command) provided to the drive is
proportional to the required drive output speed. The full-scale range of the reference signal is
hence directly proportional to the drive programmed speed range (from minimum speed to
maximum speed). The reference to the drive can be provided digitally or through the analog
reference and, once enabled, the drive will attempt to ramp and then maintain the motor speed
in relation to the reference.
Available torque on the motor shaft can be limited in parameter P4-07,
Maximum motoring
Torque limit
.
Motor voltage and current are optimised by the drive to provide the best torque performance
within the drives output current limits.
6.1.2
Torque Control
Torque Control with Speed Limit (vector): P4-01 = 1
In
Vector Torque Control
mode, the reference signal (command) provided to the drive is
proportional to the required output torque from the motor (approximately proportional to the
motor current). The full-scale range of the reference signal is hence directly proportional to the
drive programmed torque range (from zero to maximum torque set by P4-07
Maximum
motoring Torque limit
).
The torque reference to the drive can be provided digitally or through the analog reference and
once enabled the drive will attempt to maintain the requested motor torque in relation to the
reference. Torque reference source is set by parameter P4-06.
Motor output frequency and voltage are optimised in order to provide the required motor torque
output.
6.2 Encoder
Closed Loop Vector speed
provides full torque holding capability at zero speed and enhanced
operation at frequencies below 1Hz. The drive, encoder module and encoder should be
connected according to the voltage rating of the encoder. Please contact Beijer Electronics
Drive support for detailed information and choice of correct encoder module or download the
commissioning start-up document on our webpage.
