WEG CFW-09 User Manual page 138

[Factory Setting]
Parameter
P156 (2) (7) (12) P157 to 1.3 x P295
Motor Overload
Current at 100 %
Speed
P157 (2) (7)
Motor Overload
Current at 50 %
Speed
P158 (2) (7) 0.2 x P295 to P157
Motor Overload
Current at 5 %
Speed
Range
Unit Description / Notes
I (A) =
[ 1.1 x P401 ]
0.1 A(< 100)
4
-1A(> 99.9)
P156 to P158
3
[ 0.9 x P401 ]
0.1 A(< 100)
2.5
-1 A(> 99.9)
2
[ 0.55 x P401 ]
1.5
1.3
0.1 A(< 100)
1.1
-1 A(> 99.9)
0.5
0
0
% P401
110
100
98
90
55
0
0 5
Used to protect motor and inverter against timed overload (Ixt - E05).
The Motor Overload Current (P156, P157 and P158) is the current level
above which the CFW-09 will consider the motor operating under
overload. The higher the overload, the sooner the Overload Fault E05 will
occur.
Parameter P156 (motor overload current at base speed) must be set 10 %
higher than the used rated motor current (P401).
The overload current is given as a function of the motor speed. The
parameters P156, P157 and P158 are the three points used to form the
overload curve, as shown in figure 6.18 with the factory default levels.
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Motor Current (P003)
Overload Current
15 30 60 75 100
Figure 6.17 - Ixt function - Overload detection
P157
50
Curve for motor with separate ventilation
Curve for self-ventilated motor
Increased Protection Curve
Figure 6.18 - Overload protection levels
150 300
P156
100
% Speed
t (s)
139