Schaffner Group
User and Installation Manual
LCL Filter
May 2018
19/21
III.6
Connect LCL filter FN6840 line side terminals L1, L2, L3
Connect the line side terminals to power input protection (current limiting fuses – see following).
III.7
Fuses
It is recommended to add external over-current protection for the LCL filters. Table 4 shows
requested fuse current ratings for UL class J and for IEC class gG. The fuse rating is independent
of the supply voltage.
LCL filter rating
Fuse class J
Fuse class gG
All FN 6840
rated current [A]
rated current
[A]
FN6840-25-113
40
35
FN6840-50-115
80
80
FN6840-80-115
150
125
FN6840-160-118
250
224
FN6840-250-118
350
300
FN6840-380-118
600
600
Table 4: Requested fuse current rating for UL class J and for IEC class gG
6. Filter maintenance
LCL filter FN6840 described in this manual are equipped with long life components that ensure a
satisfactory function for many years under normal operating conditions. Any operation under extreme
conditions such as over-temperatures, overvoltage situations, polluted environments etc. reduces the life
expectancy. Following maintenance recommendation and maintenance schedule according Table 5 will
help maximizing filter lifetime.
Warnings:
High voltage potentials are involved in the operation of this product. Always remove line side
power before attempting to perform maintenance and let ample time elapse for the
capacitors to discharge to safe levels (<42 V). Residual voltages are to be measured both
line to line and line to earth.
Line side power must be disconnected prior to replacement of any part.
INS 1008766 A0
INS 1008766 A0
INS 1008766 A
