8
2.1.1.1 DRIVE CURRENT OVERLOAD SELECTION
Four types of drive overload can be set on C56
NB: the choice also changes the rated drive current as shown by the tables in the installation file and
the correct value is always displayed in ampere rms in P53.
The delivered current is also used to calculate the operating temperature reached by the power
component junctions with the drive presumed to be working with standard ventilation at the maximum
ambient temperature permitted.
If this temperature reaches the maximum value permitted for the junctions, the delivered power limit
is restricted to a value that is just over the rated drive current, i.e. the system’s effective thermal
current (see following table).
Now the drive will only overload if the temperature drops below the rated value, which will only occur
after a period of operation at currents below the rated current.
The junction temperature calculation also considers the temperature increase that occurs while
operating at low frequencies (below 2.5 Hz) due to the fact that the current is sinusoidal and thus has
peak values that are higher than the average value. With electrical operating frequencies lower than
2.5Hz, the drive goes into maximum overload for 20-30ms after which the maximum current limit is
reduced by √2 as shown by the following table:
N.B. = the overload time illustrated is calculated with the drive running steady at the rated motor
current. If the average delivered current is lower than the rated motor current, then the overload time
will increase. Thus the overload will be available for a longer or identical time to the ones shown.
N.B. 3٭ = the 200% overload is available until junction temperatures are estimated to be 95% of the
rated value; at the rated value the maximum limit becomes 180%. For repeated work cycles, TDE
MACNO is available to estimate the drive’s actual overload capacity
2.1.2 MOTOR PLATE
Name Description Min Max Default UM Scale
PRC_MOT_I_NOM
P61 - Rated motor
current ( I NOM MOT)
10.0 100.0 100 % DRV_I_NOM 327.67
MOT_V_NOM
P62 - Rated motor
voltage
100.0 1000.0 380 Volt 10
MOT_F_NOM
P63 - Rated motor
frequency
10.0 800.0 50.0 Hz 10
PRC_MOT_V_MAX
P64 - Max. operating
voltage
1.0 200.0 100 % MOT_V_NOM 40.96
C56 Overload type for rated drive current (P53)
0 120% for 30 seconds
1 150% for 30 seconds
2 200% for 30 seconds
3 200% for 3 seconds and 155% for 30 seconds
C56 Max. drive current Drive thermal current Limit below 2.5 Hz
0 120% I NOM AZ for 30 seconds 103% I NOM AZ 84% I NOM AZ
1 150% I NOM AZ for 30 seconds 108% I NOM AZ 105% I NOM AZ
2 200% I NOM AZ for 30 seconds 120% I NOM AZ 140% I NOM AZ
3٭
200% I NOM AZ for 3 seconds
155% I NOM AZ for 30 seconds
110% I NOM AZ 140% I NOM AZ
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