ABB ACS320 series, User Manual

Page: 205 / 442

Actual signals and parameters 205
3006
MOT THERM TIME
256 … 9999 s 1 1050 s
Sets the motor thermal time
constant for the motor temperature
model.
• This is the time required for the
motor to reach 63% of the final
temperature with steady load.
• For thermal protection
according to UL requirements
for NEMA class motors, use the
rule of thumb: MOTOR THERM
TIME equals 35 times t6, where
t6 (in seconds) is specified by
the motor manufacturer as the time that the motor can safely operate at six times its
rated current.
• 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.
3007 MOT LOAD CURVE 50 … 150% 1 100%
Sets the maximum allowable operating
load of the motor.
• With the default value 100%, motor
overload protection is functioning
when the constant current exceeds
127% of the parameter
9906
MOTOR NOM CURR value.
• The default overloadability is at the
same level as what motor
manufacturer’s typically allow in the
30 °C (86 °F) ambient temperature
and 1000m (3300 ft) altitude. When
the ambient temperature exceeds 30
°C (86 °F) or the installation altitude
is over 1000m (3300 ft), decrease the parameter 3007 value according to the motor
manufacturer’s recommendation.
Example: If the constant protection level needs to be 115% of the motor nominal
current, set parameter 3007 MOT LOAD CURVE value to 91% (=115/127*100%).
3008 ZERO SPEED LOAD 25 … 150% 1 70%
Defines the load curve together with parameters 3007 MOT LOAD CURVE and 3009
BREAK POINT FREQ .
25%…150% = Allowed continuous motor load at zero speed in percent of the nominal
motor current.
Group 30: Fault functions
Code Description Range Resolution Default S
Temp. rise
100%
63%
t
t
}
Motor load
3006
Frequency
Output current (%) relative
to 9906 MOTOR NOM CURR
150
100
50
3007
3008
3009