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P Motor Overload Protection
If the motor current I
(parameter 9906) for a prolonged period, the ACS140 automatically protects
the motor from overheating by tripping.
The trip time depends on the extent of the overload (I
frequency and nominal motor frequency f
start".
The ACS140 provides overload protection in accordance with the National
Electric Code (US). The default setting of motor thermal protection is ON.
For more information, see Group 30: Fault Functions on page 64.
1.5
1.0
0.5
0
Q Loadability of ACS140
In the event of an output overload, the ACS140 will trip.
I
out
t
I
I
2
T
I
/ I
max
2
1.5
1.4
1.3
1.2
1.1
1.0
0.1 0.2 0.3 0.4 0.5
exceeds the nominal current I
out
I
/ I
out
nom
180 s
0
max
ac.maher.co.ir
nom
out
. Times given apply to a "cold
nom
Trip time
300 s
600 s
∞
Output frequency
35 Hz
duty cycle = t/T
T< 10 min
time
Ambient temperature,
Θ
max. is 40 °
amb
50
°C
is permissible,
if I
is derated to 80 %.
2
duty cycle
of the motor
/ I
), the output
nom
.
C
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