User`s guide

101
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
Prevents motor stalling during an overload
.
If motorload
increases its currentwill increase too
.
If the motor current
attempts to exceed
the value set at
P169,
the motor
speed will be decreased by following the deceleration
ramp until the current becomes lower than P169.
As soon as the overload condition disappears, the mo-
tor speed is resumed.
P169
0.2xI
nom
to2.0xI
nom
Maximum
[ 1.5 x P295 ]
Output Current
0.01 A (


9.99 A);
0.1 A (

10.0 A)
Figure 6.14
- Curves showing the actuation of the current limitation
Time
during
cont. duty
Time
Motor current
Deceleration ramp (P101/P103)
deceleration
ramp
acceleration
ramp
during
deceleration
during
acceleration
acceleration
ramp
(P100/P102)
Speed
P169
The current limitation function is disabled when
P169 > 1.5 x P295.
P178
(1)
50.0 to 150
Rated Flux
[ 100 % ]
0.1 % (

99.9 %);
1 % (

100 %)
Definesthe fluxinthe motorairgap,wheninvectorcontrol.
It is expressed as a percentage (%) of the nominal flux.
Generally it is not necessary to change P178 of the
default value (100 %). But in some specific cases,
differentvaluesatP178 maybeset.These conditions may
be:
-
To increase the inverter torque capacity
(P178 > 100%).
Examples:
1)
toincrease themotorstarting torque and thus ensure
faster motor starts;
2)
toincrease theinverter braking torque and thus allow
faster stops, without using dynamic braking.
-
Toreducetheinverterenergyconsumption
(P178<100%).