Siemens SIMODRIVE 611 digital Configuration Manual page 164

6 Infeed Modules
6.3 Technical data
Installation altitude
over 1000 m with
limitations/
secondary
conditions
6-164
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1. Is the maximum infeed exceeded? ––> No ––> OK
2. Calculating the total duration T
T = Σ t = t + t +...+ t
i 1 2 k
3. Calculating the evaluation/assessment factor B
2 2
P  t + P  t
1 1 2
B =

T P
2 2
50  1.5 + 20  1 + 36
B =
3750 + 400 + 2592 + 0 + 1920
B =
8942.4
8662
B =
8942.4
4. Check, whether B is < B
B = 0.98
B for a load duty cycle less than 10 s = 1.03
max
––> the load duty cycle is permissible.
All of the power ratings specified apply up to an installation altitude of 1000 m
above sea level. For installation altitudes > 1000 m above sea level, the speci-
fied power ratings must be reduced according to the derating characteristic as
shown in Chapter 4.4.3. For installation altitudes > 2000 m, an isolating trans-
former must be used.
For a line supply circuit with overvoltage category III, the standard prescribes
greater isolating distances at altitudes starting at 2000 m. For this reason, a
non–line supply circuit must be implemented using an isolating transformer.
The isolating transformer is used for uncoupling of a line supply circuit (overvol-
tage category III) to form a non-line supply circuit (overvoltage category II) in
which the available isolating distances are then sufficient.
See IEC 60664–1 (required for the total system).
Notice
The power ratings for P , P
n
way.
If the power ratings are exceeded, the devices can fail prematurely.
Note
For UI modules, it must be carefully observed that the braking energy fed in
does not exceed the power rating of the pulsed resistor.
A defect does not occur; when an overload condition occurs, the resistor is shut
down.
The drive unit then goes into a fault condition, with the fault "DC link
overvoltage" and the motors coast down in an uncontrolled way.
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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= 1.5 s + 1 s + 2 s + 1.2 s + 1.2 s = 6.9 s
2
+...+ P  t
2 k k
2
n
2 2 2
 2 + 0  1.2 + 40

2
6.9 36
= 0.98
for the calculated load duty cycle T
max
and P must be reduced (derated) in the same
s6 max
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