140 Functional Description CG Drives & Automation, 01-5326-01r5
Flux Optimization [354]
Asynchronous motors
Flux Optimization for asynchronous motors reduces the
energy consumption and the motor noise, at low or no load
conditions. Flux Optimization automatically decreases the
V/Hz ratio, depending on the actual load of the motor when
the process is in a steady state. Fig. 109 shows the area
within which the Flux Optimization is active.
Permanent magnet synchronous and
synchronous reluctance motors
Flux optimization for permanent magnet synchronous
motors and synchronous reluctance motors adjusts the
V/Hz ratio, to either minimize the current or by predicting a
suitable level based on the torque (and speed). Note that
IxR compensation is needed for synchronous motors to get a
good start, also when flux optimization is activated.
Communication information
Fig. 109 Flux Optimizing
Maximum power [355]
Sets maximum power. Can be used for limiting motor
power in field weakening operation. This function operates
as an upper power limit and internally limits the parameter
“Max Torque [351]” according to :
Tlimit = Plimit[%] / (Actual Speed / Sync Speed)
Communication information
354 Flux optim
Default: Off
Off 0 Function disabled
On(lmin) 1 Flux controlled to minimize current
On 2 Flux adjusted based on the torque
Modbus Instance no/DeviceNet no: 43144
Profibus slot/index 169/48
EtherCAT and CANopen index (hex) 4c48
Profinet IO index 19528
Fieldbus format UInt
Modbus format UInt
NOTE: Flux optimization works best at stable
situations in slow changing processes.
355 Max Power
Default: Off
Off 0 Off. No power limit
1 - 400 1 - 400 1 - 400% of motor nominal power
NOTE: The maximum possible setting for parameter
[355] is limited by I
NOM
/I
MOT
x 120%, but not higher
than 400%.
Modbus Instance no/DeviceNet no: 43145
Profibus slot/index 169/49
EtherCAT and CANopen index (hex) 4c49
Profinet IO index 19529
Fieldbus format Long, 1=1%
Modbus format EInt
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