5-58
Application Manual CDA3000
5 Software functions
Factory setting
Figure 5.22 Below the rated frequency f
N
(or rated current I
N
)themotorcan
be protected by freely programmable current limits
(for explanations of the short names see Table 5.33).
Note: The shutdown times in the case of characteristic adaptation
cannot be read from a pre-drawn diagram, but must be calcu-
lated separately for individual operation points.
If the current and actual frequency of an operation point are known, the
Ixt monitoring can be calculated.
For segments , and different calculation formulae are pro-
duced. The appropriate formula is determined on the basis of the actual
frequency.
1. Calculation of the maximum Ixt factor (limit)
I
N
= 335-MOPCN
f
N
= 336-MOPFN
I
b
= 331-MOPCB
f
b
= 333-MOPFB
I
a
= 332-MOPCA
I[A]
I
N
I
a
I
b
f
N
f
b
f [Hz]
1
2 3
ixt
max
= (1.5 - 1.1) x MOCNM x 60 s
Max. overload time
Motor rated current
Current factor for start of
Ixt monitoring
Current factor for
max. motor current
ixt
max
=24xMOCNM
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