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Technical Manual N5 (CANopen)
7 Special functions
7.3.3 Activation
Closed loop must be activated, (bit 0 of object 3202
set to "1", see also chapter Closed Loop). To
activate the mode, the three object entries mentioned above (2031
h
:1,
h
h
:2
h
) must have
been appropriately specified. This means that the maximum current must be greater than the rated
current and a time value for the maximum duration of the maximum current must be entered. If these
conditions are not met, the I
2
t functionality remains deactivated.
7.3.4 Function of I
2
t
From the specification of rated current, maximum current and maximum duration of the maximum
current, an I
2
t
Lim
is calculated.
The motor can run with maximum current until the calculated I
2
t
Lim
is reached. The current is then
immediately reduced to the rated current.
The relationships are illustrated again in the following diagram.
current
t1
t2
t1
Lim
t2
Lim
I
2
t
I
2
t
t
Maximum
current
Nominal
current
In the first section, t1, the current value is higher than the rated current. At time t1
Lim
, I
2
t
Lim
is reached
and the current is limited to the rated current. A current that corresponds to the maximum current then
occurs for a period of time t2. Hence, the value for I
2
t
Lim
is reached more quickly than in time t1.
7.4 Saving objects
Note
Improper use of the function can result in it no longer being possible to start the controller. Therefore,
carefully read the entire chapter before using the function.
7.4.1 General
Many objects in the object dictionary can be saved and then automatically reloaded the next time the
controller is switched on or reset. Furthermore, the saved values are also retained following a firmware
update.
Version: 2.0.1 / FIR-v1650
97