Chapter 5 Function Code Table
- 72 -
Function
Code
Parameter Name Function Description Setting Range Default
bE.01
Motor overload
protection gain
When the motor keeps running at 115% of the rated
motor current for 80 minutes, the 11# fault (motor
overload) is reported.
For example, the rated motor current is 100 A,
If bE.01 = 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 11# fault is reported.
If bE.01 = 1.20, when the motor running current
reaches 125 A (125% of 100 A) and the motor runs
at 125 A for 40 x 1.2 = 48 minutes, the 11# fault is
reported.
The motor overload protection supports protection
of the longest 80 minutes and the shortest 10
seconds.
For example, the application requires report of
the 11# fault when the motor runs at 150% of the
rated motor current for two minutes. According to
the preceding motor overload curve, 150% (I) is
in the range of 145% (I1) and 155% (I2). 145%
corresponds to the overload protection time 6
minutes (T1) and 145% corresponds to the overload
protection time 4 minutes (T2). You can calculate
the overload protection time T corresponding to
150% from the following formula:
T = T1 + (T2 - T1) x (I - I1) / (I2-I1) = 4 + (6 - 4) x
(150% - 145%) / (155%-145%) = 5 minutes
Then you can calculate the motor overload
protection gain from formula: F9-01 = Desired
overload protection time / Corresponding overload
protection time = 2/5 = 0.4.
bE.01= 2 ÷ 5 = 0.4
Set bE.01 properly according to the actual overload
capacity of the motor. If the setting is too large, the
AC drive may not report the 11# fault timely when
the motor is damaged due to overheating.
The motor overload pending coefcient indicates
when the motor overload detection level reaches
the setting of this parameter, the output function 9
(motor overload pending) is active. In this case, the
AC drive continues to run but does not report the
motor overload fault.
For example, when the motor overload protection
gain is set to 1.00 and the motor overload pending
coefcient is set to 80%, if the motor current
reaches 145% of the rated motor current and the
motor runs at the level for 4.8 minutes (80% x 6
minutes), the output function 9 is active.
0.20 to 10.00 1.00
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