Danfoss VLT AAF006 - 3 Mechanical Installation; 3.1 Pre-installation; 3.1.1 Planning the Installation Site; 3.1.2 Receiving the Active Filter

1.6 Fuses
Table 1.5 provides the types and ratings and function of various fuses for the AAF.
Identification Type Current rating Function If blown check for short in
FU4 KLK 15 A Fan Fuse Heatsink or Door Fan
FU5 KLK 4 A DC Bus plus to Power Card for SMPS SMPS on Power Card
FU6 FNQ-R3 3 A Primary of contactor transformer Transformer
FU8 G See Note Line Power Input Fuse (Optional) Power Component
FU9 G See Note Line Power Input Fuse (Optional) Power Component
FU10 G See Note Line Power Input Fuse (Optional) Power Component
FU11 KLK 15 A Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Fan Transformer
FU12 KLK 15 A Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Fan Transformer
FU13 KLK 15 A Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Fan Transformer
FU14 FQN-R 1 A Soft Charge Resistor DC Capacitor Bank, IGBT Module
FU15 FQN-R 1 A Soft Charge Resistor DC Capacitor Bank, IGBT Module
Table 1.5 Fuse Ratings and Functions
NOTE!
Size Dependent. AAF190 = 250 A, AAF310 = 400 A, AAF400 = 500 A
1.7 Current Transducers
1.7.1 Current Transducers
Current transducers are used to monitor current in various
locations in the filter. Three current transducers on the
output-phases bus bars induce counter harmonics onto
line power. There are also three current transformers on
the line power bus bars outside of the active filter. The
information from these three transformers, via the active
filter card, is what the filter compensates for on the line
power. (For the LHD drive, these transformers are on the
line power input bus bars of the Adjustable frequency
drive for measuring the harmonics caused by the
Adjustable frequency drive.) Three other current
transducers in the LCL filter section are used for overload
protection for the AC capacitors and damping resistors.
Identifi-
cation
Type Function
CT1 Hall Effect Output of inverter IGBT current sensor
CT2 Hall Effect Output of inverter IGBT current sensor
CT3 Hall Effect Output of inverter IGBT current sensor
CT4 Hall Effect AC capacitor current sensor
CT5 Hall Effect AC capacitor current sensor
CT6 Hall Effect AC capacitor current sensor
CT7 Current
Transformer
External current transformer
CT8 Current
Transformer
External current transformer
CT9 Current
Transformer
External current transformer
Table 1.6 Current Transducers
Introduction VLT Advanced Active Filter AAF006 D and E Frames Service Manual
1-4 MG90Z122 - VLT
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