7
05.01
7.3 Line supply fuses, transformers and main switch
7-211
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
For timely tripping of fuses, the loop resistance as well as the vector group of
the line supply transformer being fed must satisfy the requirement that the touch
voltage of the devices is switched off by the provided fuses within the permissi-
ble tripping time (see Fig. 7-7 in accordance with EN 61800–5–1 Ed. 2007).
10
100
1 000
10 000
Touch voltage (V)
Time (ms)
25 V AC
AC–2
60 V DC
DC–2
AC–2 DC–2
Decisive voltage class A
30 V AC
AC–2
250 V
10 100 1000
Fig. 7-7 Permissible tripping time of fuses/circuit–breakers
7 Line Su
l
Connection05.08
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