Hardware Manual

Planning the electrical installation 65
Additional data for calculating the rise time and the peak line-to-line voltage
If you need to calculate the actual peak voltage and voltage rise time considering the
actual cable length, proceed as follows:
• Peak line-to line voltage: Read the relative Û
LL
/U
N
value from the appropriate
diagram below and multiply it by the nominal supply voltage (U
N
).
• Voltage rise time: Read the relative values Û
LL
/U
N
and (du/dt)/U
N
from the
appropriate diagram below. Multiply the values by the nominal supply voltage (U
N
)
and substitute into equation t = 0.8 · Û
LL
/(du/dt).