WEG CFW08 Vector inverter User Manual page 81

DETAILED PARAMETER DESCRIPTION
Parameter
P169 0.2xPI
Maximum Output
Current
P178
Rated Flux
This
parameter is shown
only in vector
control (P202=2)
80
Range
[Factory Setting]
Unit Description / Notes
Parameter P156 must be set from 10% to 20% higher than the
rated motor current (P401).
Always P401 is changed, P156 is adjusted automatically to
1.1xP401.
Prevents motor stalling during an overload. If motor load increases
...2.0xPI
nom nom
its current will increase too. If the motor current attempts to exceed
[ 1.5xP295 ]
the value set at P169, the motor speed will be decreased by following
0.01A (<10.0A);
the deceleration ramp until the current becomes lower than P169.
0.1A (>9.99A)
As soon as the overload condition disappears, the motor speed is
resumed.
acceleration
(P100/P102)
Figure 6.14 – Curves showing the actuation of the current limitation
The current limitation function is disabled when P169>1.5xP295.
Defines the flux in the motor air gap, when in vector control. It is
50.0...150.0%
[ 100% ] expressed as a percentage (%) of the nominal flux.
Generally it is not necessary to change P178 of the default value
0.1% (<100%);
1% (>99.9%) (100%). But in some specific cases, different values at P178 may
be set.These conditions may be:
- to increase the inverter torque capacity (P178>100%).
- to reduce the inverter energy consumption (P178<100%).
Motor Current (P003)
Overload Current
3,0
2,0
1,5
1,0
15 30
Figure 6.13 - Ixt function – Overload detection
Motor Current
P169
Speed
ramp
Deceleration ramp (P101/P103)
during
acceleration
Examples:
1) to increase the motor starting torque and thus ensure faster
motor starts;
2) to increase the inverter braking torque and thus allow faster
stops, without using dynamic braking.
Time (s)
60 90
accel.
decel.
ramp
ramp
during during
cont. duty deceleration
Time
Time