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Code Description
3004 MOTOR 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 140 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 9 shows motor
thermal time definition.
If thermal protection according to UL requirements for NEMA class motors is
desired, use this rule of thumb -
seconds is the time that the motor can safely operate at six 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 9
3006 MOT LOAD CURVE
Motor current maximum limit.
operating load of the motor. When set to 100 %, the maximum allowable load is
equal to the value of Start-up Data parameter 9906
load curve level should be adjusted if the ambient temperature differs from the
nominal value.
Output current (%) relative
to 9906
3006
Figure 10 Motor load curve.
3007 ZERO SPEED LOAD
This parameter defines the maximum allowable current at zero speed relative to
9906
MOTOR NOM CURR
3008 BREAK POINT
Break point of motor load curve. Refer to Figure 10 for an example of a motor
load curve. See Figure 12.
46
Motor
Load
Temp.
Rise
100 %
63 %
Motor thermal time.
MOTOR NOM CURR
MOT LOAD CURVE
3007
ZERO SPEED LOAD
. Refer to Figure 10.
MOTOR THERM TIME
Mot therm time
MOTOR LOAD CURVE
150
100
50
3008
BREAK POINT
equals 35 times t6 (t6 in
t
t
sets the maximum allowable
MOTOR NOM CURRENT
Frequency
. The
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