Schaffner Group
User and Installation Manual
Ecosine
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8.3.5 Install external capacitive current control
For configurations with TDJ option, thus without integrated
switch (see sections 2.1 to 2.4), terminals D1- D1’, D2- D2’
and D3- D3’ are delivered with installed jumpers. This con-
figuration allows to install any third party switch circuit
breaker (not supplied by Schaffner) and when necessary an
additional capacitor contactor (not supplied by Schaffner).
The usage of a capacitor contactor in line in the trap capaci-
tor circuit allows for load dependent disconnection of the
trap circuit, if needed. Therefore, capacitive current can be
minimized for low load operation.
Estimation of required capacitor contactor size: see box to
the right.
Warning:
protection of the trap capacitor against
over current is still required, it is not recommended to use
the filter without any switch installed. The customer is fully
responsible for any inappropriate usage of the filter.
8.3.6 Connect monitor switch TS- TS’
The monitor switch is a relay contact, which is open in
ALARM state. It is constituted by a thermal switch NC 180°C
(UL-approved) to detect overload of chokes. It may either be
used to remotely disconnect the drive’s load via respective
input of drive control (check drive manual) or as an alarm
switch for system control unit.
For wire cross section recommendation see section 3.6.2.
Warning: an engaged moni-
tor switch must lead to immediate
load shutdown and investigation of
the problem.
Circuit breaker/contactor perfor-
mance estimate:
Example: FN 3470-500-99-
E0XXJXX
The nominal power rating in kW
multiples 20% and the grid voltage,
then divided by the nominal voltage
(400 V for FN 347X, 480 V for
FN 348X) is the approximate reac-
tive power
Switch rating =
500
𝑘𝑘𝑘𝑘 ∗
20%
∗
𝑉𝑉
𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔
𝑉𝑉
𝑛𝑛𝑛𝑛𝑛𝑛
=
500
𝑘𝑘𝑘𝑘 ∗
20%
∗
400
𝑉𝑉
400
𝑉𝑉
= 100
𝑘𝑘𝑉𝑉𝑘𝑘𝑘𝑘
