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Internal Frequency Converte...
3.3.2 Intermediate Section
Following the rectifier section, voltage passes to the
intermediate section. (See following illustration). This
rectified voltage is smoothed by an LC filter circuit
consisting of the DC bus inductor and the DC bus
capacitor banks per each inverter module.
The DC bus inductor provides series impedance to
changing current. This aids the filtering process while
reducing harmonic distortion to the input AC current
waveform normally inherent in rectifier circuits.
Each inverter module contains two DC capacitor bank
assemblies consisting of up to eight capacitors arranged in
series/parallel configuration. Also contained within the
assembly is the bleeder/balance circuitry. This circuitry
maintains equal voltage drops across each capacitor and
provides a current path for discharging the capacitors once
power has been removed from the frequency converter.
Also located in the intermediate section is the high
frequency (HF) filter card for each inverter module. It
LOCATED IN RECTIFIER CABINET: 400VA TRANSFORMER, FUSIBLE DISCONNECT AND 24V POWER
SUPPLY
X1
H1
T1
BLK
WHT
GRN/YEL
X2
H2
24V AC/DC
400VA
POWER SUPPLY
TRANSFORMER
CBL20
+
-
BLK
WHT
WHT
BLK
WHT
SPLICE
BLK
CBL20
FOUR-POLE
FUSIBLE
DISCONNECT
KLIXON IS INSTALLED IN CASE THERE IS AN OPTION CABINET
RFI KLIXON
Fu1
Fu2
Fu3
Fu4
6A
6A
6A
6A
106 104
SCR DIS/ENA TERMINAL BLOCKS
LOCATED IN RECTIFIER CABINET
WHT
BLK
A1/C2
LOCATED IN OPTIONS CABINET
BLK
BLK
WHT
DIFF. MODE
DIFF. MODE
FILTER
FILTER
WHT
BLK
MAINS FUSES
14 11 OF1
R
L1
91
S
L2
92
T
93
L3
DS1
GND
94
DISCONNECT
TB1
C1
WHT
BLK
MX
C2
BLK
CB
WHT
CB1
Illustration 3.8 Intermediate and inverter sections
High Power Service Manual for Modular F Frame Drives
DOOR INTERLOCKS
RECTIFIER CABINET
INVERTER CABINET
OPTION CABINET
DOOR INTERLOCK
DOOR INTERLOCK
DOOR INTERLOCK
-
+
-
+
-
+
BLK
WHT
BLK
WHT
WHT
BLK
2
2
1
1
CBL21
JUMPER IS INSTALLED
IN CASE THERE IS
NO OPTION CABINET
CBL1
2
2
1
1
BLK
BLK
2
2
WHT
WHT
1
1
WHT
CBL3
RECTIFIER CABINET DOOR FAN
BLK
FAN-
L
N
FAN+
GND
PE
CBL2
BLK
L
FAN-
RFI
FAN+
N
WHT
WHT
BLK
GND
PE
OPTION CABINET DOOR FAN
CBL23
2
2
RED
CBL4
1
1
BLK
WHT
U
3
3
DC
NOT USED
CBL1
BLK
5
1 8
7 6
3
1011
3
1
8
7
6
WHT
WHT
11 10 9
14-Pin
6-Pin
16-Pin
BLK
Aux 2
Aux 1
RFI/CAN/SCR DIS/ENA
INVERTER
Relay
Relay
WHT
DC-Link
Not used
-SCR
BLK
WHT
CBL7
1
+SCR
RECTIFIER
30
1
20
R' S' T'
12-Pin
44
7 9 11
8 10 12
2 4 6
R
S
T
DIFF. MODE
FILTER
FU1
FU2
FU3
CBL8
M1
C14
C13
CONTACTOR
WHT
BLK
WHT
BLK
BLK
C21
C22
C1 C2
WHT
A1
A2
A1
A2
C21 C22
C13 C14
LOCATED IN OPTIONS CABINET: CB AND CONTACTOR TERMINAL BLOCKS
SHUNT TRIP
®
MG90K202 - VLT
is a registered Danfoss trademark
contains a high frequency filter circuit to reduce naturally
occurring currents in the HF range to prevent interference
with other sensitive equipment in the area. The circuit, as
with other RFI filter circuitry, can be sensitive to
unbalanced phase-to-earth voltages in the three-phase AC
input line. This can occasionally result in nuisance
overvoltage alarms. For this reason, the high frequency
filter card on 380–500 V range frequency converters,
contains a set of relay contacts in the earth connection of
the filter capacitors. The relay is tied into the RFI/HF
switch, which can be switched on or off in 14-50 RFI Filter.
This disconnects the earth references to all filters to
eliminate nuisance overvoltage conditions created by an
unbalanced phase-to-earth voltages.
For 525–690 V frequency converters, the customer may not
open the relay contacts to disconnect the earthing via
14-50 RFI Filter, but the relay automatically opens based on
the DC bus voltage to protect the drive.
CURRENT
CBL19
SCALING
CARD
FC-X02
INV1
CBL18
1
FK100
LCP
ANALOG I/O
RS-485
61 68 69
S
+
-
39 42
50
53 54 55
DIGITAL INPUTS
1
12 13
18
19
27
29 32 33 20 37
FK101
HEATSINK/DOOR
FAN TRASNFORMER
CBL9
CBL10
WHT
BLK
RED
1
1
CBL3
INVERTER CABINET DOOR FAN
FAN-
FAN+
GND
CBL3
FAN-
FAN+
GND
INVERTER CABINET DOOR FAN
CBL7
BLK
WHT
BLK
WHT
44
1
4
3
6
1
4
3
6
44
1
8
7
6
11 10 9
6-Pin
6-Pin
16-Pin
WHT
FU5
FU7
DC-Link
DC-Link
Aux 2
Aux 1
Relay
Relay
BLK
RED
WHT
FU6
FU4
BLK
DC+
DC+
INVERTER 2
INVERTER 1
1
DC-
DC-
RED
RED
R'
R'
WHT
WHT
30
S'
S'
T'
T'
BLK
BLK
BRAKE
TERMINALS
R+
R-
W1
V1
MOTOR TERMINALS
U1
CURRENT
CURRENT
SCALING
SCALING
CARD
CARD
INV2
INV3
MDCIC CARD
PCA13
44
1
FK102
44
44
1
FK103
44
MK101
MK102
CAN
CAN
6
5
4
3
2
1
6
5
4
3
2
1
BLK
WHT
RED
LOAD SHARE
(UNIDIRECTIONAL)
LOCATED IN RECTIFIER CABINET
HEATSINK/DOOR
HEATSINK/DOOR
FAN TRASNFORMER
FAN TRASNFORMER
CBL11
WHT
RED
BLK
BLK
RED
1
1
1
1
CBL17
CBL3
CBL3
BLK
WHT
NOT USED
NOT USED
1
1
4
3
6
44
1
8
8
7
6
11 10 9
7
6
11 10 9
WHT
6-Pin
16-Pin
FU9
16-Pin
DC-Link
Aux 2
Aux 1
Aux 2
Aux 1
Relay
Relay
Relay
Relay
BLK
RED
WHT
FU8
BLK
DC+
INVERTER 3
1
DC-
1
RED
R'
WHT
S'
30
30
T'
BLK
BRAKE
BRAKE
TERMINALS
TERMINALS
R+
R+
R-
R-
W2
W3
V2
V3
MOTOR TERMINALS
MOTOR TERMINALS
U2
U3
3
3
LOAD SHARE
TERMINALS
REGEN
TERMINALS
LOCATED IN INVERTER
CABINET
53
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