ABB ACS140 - Motor Overload Protection; Loadability of ACS140

13
P Motor Overload Protection
If the motor current I
out
exceeds the nominal current I
nom
of the motor
(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
out
/ I
nom
), the output
frequency and nominal motor frequency f
nom
. Times given apply to a “cold
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.
Q Loadability of ACS140
In the event of an output overload, the ACS140 will trip.
I
out
/ I
nom
Output frequency
180 s 300 s
600 s
∞
1.5
1.0
0.5
Trip time
0
0 35 Hz
I
max
/ I
2
duty cycle
Ambient temperature,
Θ
amb
max. is 40 °C.
50
°C is permissible,
if I
2
is derated to 80 %.
I
out
time
duty cycle = t/T
T< 10 min
I
2
t
1.5
1.4
1.3
1.2
1.1
1.0
0.1
0.2
0.3
0.4
0.5
I
max
T
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