WEG CFW501 V1.8X Programming Manual page 138

Faults and Alarms
P0156 – Overload Current at Rated Speed
P0157 – Overload Current 50 % of Rated Speed
P0158 – Overload Current 20 % of Rated Speed
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
These parameters define the motor overload current (Ixt - F0072). The motor overload current is the current
value (P0156, P0157 and P0158) based on which the inverter will understand that the motor is operating in
overload.
For self-ventilated motors, the overload current depends on the speed that is being applied to the motor.
Therefore, for speeds below 20 % of the rated speed the overload current is P0158, while for speeds between
20 % and 50 % the overload current is P0157, and above 50 %, it is P0156.
The greater the difference between the motor current and the overload current (P0156, P0157 or P0158), the
faster the actuation of fault F0072.
It is recommended that parameter P0156 (motor overload current at rated speed) be set at a value 10 % above
the used motor rated current (P0401).
In order to deactivate the motor overload current function just set parameters P0156 to P0158 to values equal
to or above two times the inverter rated current P0295.
Figure 14.1: Actuation of the motor overload on page 14-3
the standard output current in relation to the overload current (P0156, P0157 or P0158), that is, for a constant
output current with 150 % of overload, Fault F0072 occurs in 60 seconds. On the other hand, for output current
values below P0156, P0157 or P0158, according to the output frequency, fault F0072 does not occur. Whereas
for values above 150 % of P0156, P0157 or P0158 the fault actuation time is below 60 s.
14
14-2 | CFW501
0.0 to 200.0 A
MOTOR
Factory
Setting:
shows the overload actuation time considering
P0156 = 1.1 x Inom
P0157 = 1.0 x Inom
P0158 = 0.8 x Inom