Selection of Options
‑114‑
Figure 4‑20 Motor overload protection curve
When the motor running current reaches 175% of the rated motor current and the
motor runs at this level for 2 minutes, E11.00 (motor overload) is detected. When the
motor running current reaches 115% of the rated motor current and the motor runs
at this level for 80 minutes, E11.00 (motor overload) is detected.
Example 1: The rated motor current is 100 A.
If F9‑01 (Motor overload protection gain) is set to 1.00, when the motor running
current reaches 125 A (125% of 100 A) and the motor runs at 125 A for 40 minutes, the
AC drive reports E11.00 (motor overload). If F9‑01 (Motor overload protection gain) is
set to 1.20, when the motor running current reaches 125 A (125% of 100 A) and the
motor runs at 125 A for 48 minutes (40 x 1.2), the AC drive reports E11.00 (motor
overload).
Note
The maximum overload time is 80 minutes and the minimum overload time is 10 seconds.
Example 2: If the AC drive is required to report the overload fault when the motor runs
at 150% of the rated current for 2 minutes.
According to the motor overload curve, 150% (I) is in the range of 145% (I1) and 155%
(I2). 145% corresponds to overload protection time 6 minutes (T1) and 155%
corresponds to overload protection time 4 minutes (T2). It can be concluded that in
default settings, the overload protection time for 150% rated current of the motor is 5
minutes. It can be calculated as follows:
T = T1 + (T2 ‑ T1) x (I ‑ I1) / (I2‑I1) = 6 + (4 ‑ 6) x (150% ‑ 145%) / (155%‑145%) = 5
minutes
To Next Page
Loading...
