ABB ACS 400 User Manual page 96

Code Description
3004 MOT THERM PROT
Motor overtemperature function. This parameter defines the operation of the motor thermal protection
function which protects the motor from overheating.
0 =
NOT SEL
1 =
FAULT
Displays a warning indication at the warning level (95 % of the nominal value). Displays a fault indication
when the motor temperature reaches the 100 % level. The ACS 400 coasts to stop.
2 =
WARNING
A warning indication is displayed when the motor temperature reaches the warning level (95 % of the
nominal value).
3005 MOT THERM TIME
Time for 63 % temperature rise. This is the time within which the motor temperature reaches 63 % of the
final temperature rise. Figure 45 shows motor thermal time definition.
If thermal protection according to UL requirements for NEMA class motors is desired, use this rule of thumb
-
MOTOR THERM TIME
times its rated current, given by the motor manufacturer). The thermal time for a Class 10 trip curve is 350 s,
for a Class 20 trip curve 700 s and for a Class 30 trip curve 1050 s.
Figure 45 Motor thermal time.
3006 MOT LOAD CURVE
Motor current maximum limit.
When set to 100 %, the maximum allowable load is equal to the value of Start-up Data parameter 9906
MOTOR NOM CURRENT
nominal value.
3006
3007
Figure 46 Motor load curve.
86
equals 35 times t6 (t6 in seconds is the time that the motor can safely operate at six
Motor load
Temp. Rise
100 %
63 %
Mot therm time
MOTOR LOAD CURVE
. The load curve level should be adjusted if the ambient temperature differs from the
Output current (%) relative
to 9906
MOTOR NOM CURR
150
100
MOT LOAD CURVE
50
ZERO SPEED LOAD
sets the maximum allowable operating load of the motor.
3008
BREAK POINT
t
t
Frequency
ACS 400 User's Manual