1.6 Fuses
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
®
is a registered Danfoss trademark
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