Fuses; Current Transducers - Danfoss VLT AAF006 Service Manual

Introduction
1 1

1.6 Fuses

Table 1.5 provides the types and ratings and function of various fuses for the AAF.
Identification
FU4
FU5
FU6
FU8
FU9
FU10
FU11
FU12
FU13
FU14
FU15
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.
1-4
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
Type Current rating
KLK 15 A
KLK 4 A
FNQ-R3 3 A
G See Note
G See Note
G See Note
KLK 15 A
KLK 15 A
KLK 15 A
FQN-R 1 A
FQN-R 1 A
MG90Z122 - VLT
Function
Fan Fuse
DC Bus plus to Power Card for SMPS
Primary of contactor transformer
Line Power Input Fuse (Optional)
Line Power Input Fuse (Optional)
Line Power Input Fuse (Optional)
Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Line Power Supply to Power Card for Fans &
Soft Charge Circuit
Soft Charge Resistor
Soft Charge Resistor
Identifi- Type
cation
CT1 Hall Effect
CT2 Hall Effect
CT3 Hall Effect
CT4 Hall Effect
CT5 Hall Effect
CT6 Hall Effect
CT7 Current
Transformer
CT8 Current
Transformer
CT9 Current
Transformer
Table 1.6 Current Transducers
®
is a registered Danfoss trademark
If blown check for short in
Heatsink or Door Fan
SMPS on Power Card
Transformer
Power Component
Power Component
Power Component
Fan Transformer
Fan Transformer
Fan Transformer
DC Capacitor Bank, IGBT Module
DC Capacitor Bank, IGBT Module
Function
Output of inverter IGBT current sensor
Output of inverter IGBT current sensor
Output of inverter IGBT current sensor
AC capacitor current sensor
AC capacitor current sensor
AC capacitor current sensor
External current transformer
External current transformer
External current transformer