WEG CFW-09 - Page 138

139
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter
Unit
Description / Notes
P156
(2) (7) (12)
P157 to 1.3 x P295
MotorOverload
[ 1.1 x P401 ]
Current at 100 %
0.1A(< 100)
Speed
-1A(>99.9)
P157
(2) (7)
P156 to P158
MotorOverload
[ 0.9 x P401 ]
Current at 50 %
0.1A(< 100
)
Speed
-1A(> 99.9)
P158
(2) (7)
0.2 x P295 to P157
MotorOverload
[ 0.55 x P401 ]
Current at 5 %
0.1A(< 100)
Speed
-1A(> 99.9)
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 theoverload,the sooner theOverloadFaultE05will
occur.
ParameterP156(motoroverloadcurrentatbasespeed)mustbeset 10%
higher than theused ratedmotor 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.
Motor Current (P003)
Overload Current
% P401
0
5
50
100
110
100
98
90
55
0
I (A) =
4
3
2.5
2
1.5
1.3
1.1
0.5
0
0 15 30 60 75 100 150
300
% Speed
P156
P157
Curve for motor with separate ventilation
Curve for self-ventilated motor
Increased Protection Curve
t (s)
Figure 6.17
- Ixt function - Overload detection
Figure 6.18
- Overload protection levels