Motor Overload Protection; Loadability Of Acs 400 - ABB ACS 400 User Manual

Q Motor Overload Protection
If the motor current I
out
ACS 400 automatically protects the motor against overheating by tripping.
The trip time depends on the extent of the overload (I
given apply to a "cold start".
ACS 400 provides overload protection in accordance with the National Electric Code (US). Default
setting is motor thermal protection ON. For more information see Group 30 parameters, page 85 in
this manual.
Figure 31
R Loadability of ACS 400
In the event of an output overload, the ACS 400 will first show an alarm and then trip.
I
out
t
I
2
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
Figure 32
ACS 400 User's Manual
exceeds nominal current I
I / I
out N
1.5
1.0
0.5
0
0
I
max
T
time
Constant torque rating
Squared torque rating
of the motor for a prolonged period, the
N
/ I ), the output frequency and f
out N
Output frequency
35 Hz
I
in squared torque (I
Duty cycle
constant torque (I
applications, see Table 11.
duty cycle = t/T
<
T 10 min
Ambient temperature,
θ
°
max. is 40 C.
amb
°
50 C is permissible,
if I and I are derated to 90 %.
2 max
= maximum output current
max
2NSQmax
2Nmax
. Times
nom
) and
)
25