BA-en-2014-2006_ES51 13
3.5 Maximum active bar length and length of the high
voltage cable
Both the lengths of the high voltage cable and of the active bars are lim-
ited. The shielded high voltage cables cause a capacitive load on the
transformer inside the power supply. The maximum loading capacity is a
result of the function of the total active bars length and the total length of
all high voltage cables. Fig. 4 demonstrates this principle for R5x bars.
Example: The maximum permissible total cable length with a 3 meter
active bar length is 32 meters.
3.6 Connecting supply voltage
Depending on the design of the power supply, connect the supply voltage
via the power supply lead (1, Fig. 1) using an earthing pin plug (depending
on country); Overvoltage category II (exception: overvoltage category III
for version ES51/S).
To ensure that no voltage is supplied to the bars when the material web is
at rest, enabling the supply voltage to the power supply via machine con-
tact is recommended. If the material web is at rest, or if the machine is not
in operation, no high voltage is supplied to the bars in this case.
For external security of the power supply the following circuit breaker is
recommended: Tripping Characteristic 2A / K according to DIN VDE 0660
Part 101, DIN EN 60947-2 and IEC 947-2.
Fig. 4:
Loading capacity
of the power
supply as factor of
bar length and
length of high
voltage cable.
Z00041e
Σ lengths of h.v. cable [m]
Σ lengths of active bars [m]
15
10
5
10 20 30 40 50
permissible
range
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