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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
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.
GND
L1
R
S
L2
T
L3
91
92
93
94
FU3
FU2
FU1
TB1
DIFF. MODE
MK3
MK2
MK1
FILTER
RECTIFIER
R
MK106
FK101
MDCIC CARD
INVERTER 1
S
T
LOAD SHARE
(UNIDIRECTIONAL)
INVERTER 2
INVERTER 3
FK100
FK103
T'
S'
R'
R'
T'
S'
R'
T'
S'
3
DC
U
MK1
0
0
GND
FAN-
FAN+
GND
FAN-
FAN+
GND
FAN-
FAN+
1
30
1
44
FK102
GND
FAN-
FAN+
1
44
1
44
1
44
1
44
44
1
44
1
44
1
1
30
1
30
1
30
1011
5
1 8
1
2
1
2
7 6
3
1
Aux 1
Relay
Aux 2
Relay
8
7
6
11 10 9
INVERTER
RFI/CAN/SCR DIS/ENA
12-Pin
8
-Pin
8
5
L
N
PE
L
N
PE
4
1
7 9 11
8 10 12
2 4 6
7
2
1
2
2
BLK
WHT
RED
3
3
1
1
6-Pin
8
-Pin
1
0
-Pin
6-Pin
6
2
5
8
-Pin
6
2
5
8
-Pin
6
2
5
16-Pin
BLK
WHT
RED
BLK
RED
1
3
4
6
1
0
-Pin
7
2
1
1
0
-Pin
7
2
1
14-Pin
8
7
6
11 10 9
16-Pin
8
7
6
11 10 9
16-Pin
8
7
6
11 10 9
16-Pin
5
10
5
10
1
2
1
2
RF
I
CARD
+
-
MK1
3
1
2
MK7
MK5
MK6
RF
I
CARD
+
-
MK7
MK5
MK6
RF
I
CARD
+
-
MK7
MK5
MK6
MK1
3
1
2
MK1
3
1
2
3
3
DIFF. MODE
MK3
MK2
MK1
FILTER
DIFF. MODE
MK3
MK2
MK1
FILTER
BLK
WHT
RED
BLK
WHT
BLK
WHT
WHT
BLK
BLK
WHT
BLK
WHT
BLK
WHT
BLK
WHT
BLK
WHT
BLK
WHT
6-Pin
1
3
4
6
BLK
WHT
BLK
WHT
1
3
4
6
BLK
WHT
RED
BLK
WHT
RED
BLK
WHT
RED
BLK
WHT
RED
BLK
WHT
BLK
WHT
RED
BLK
WHT
BLK
WHT
BLK
WHT
3
MK101
6
4
5
CAN
2
1
3
MK102
6
4
5
CAN
2
1
SCALING
CURRENT
CARD
MK107
SCALING
CURRENT
CARD
MK108
SCALING
CURRENT
CARD
MK109
FC-X02
LCP
RED
BLK
WHT
POWER
CARD
TEST
CONNECT
OR
POWER
CARD
TEST
CONNECT
OR
POWER
CARD
TEST
CONNECT
OR
Aux 1
Relay
Aux 2
Relay
Aux 1
Relay
Aux 2
Relay
Aux 1
Relay
Aux 2
Relay
DC-Link
DC-Link
DC-Link
DC-Link
R' S' T'
DC+
DC-
+SCR
-SCR
DC+
DC-
DC+
DC-
6-Pin
20
1
2
1
2
2
2
1
1
3
4
7
8
3
4
7
8
3
4
7
8
2
2
3
3
1
1
2
2
3
3
1
1
Not used
POWER
CARD
TEST
CONNECT
OR
FU4
FU5
FU6
FU7
FU8
FU9
INV1
INV2
INV3
NOT USED
NOT USED
NOT USED
FOUR-POLE
FUSIBLE
DISCONNECT
400VA
TRANSFORMER
24V AC/DC
POWER SUPPLY
BLK
+
-
OPTION CABINET
DOOR INTERLOCK
RECTIFIER CABINET
DOOR INTERLOCK
INVERTER CABINET
DOOR INTERLOCK
BLK
WHT
BLK
WHT
BLK
WHT
BLK
WHT
-
+
-
+
-
+
WHT
WHT
BLK
WHT
BLK
Fu2
Fu1
Fu3
Fu4
WHT
BLK
WHT
BLK
WHT
BLK
GRN/YEL
106 104
14 11 OF1
C1
C2
MX
C1
C2
BLK
WHT
SHUNT TRIP
1
2
1
2
CBL1
CBL2
CBL3
CBL4
CBL7
CBL8
CBL9
CBL10
CBL11
CBL3
CBL7
CBL3
CBL3
CBL3
CBL17
CBL18
CBL19
A1/C2
RFI
CB
CBL20
CBL20
MAINS FUSES
CBL21
CBL23
61 68 69
+
S
-
RS-485
50
39 42
53 54 55
18
12 13
27
19
29 32 33 20 37
ANALOG I/O
DIGITAL INPUTS
MOTOR TERMINALS
W1
V1
U1
BRAKE
TERMINALS
R+
R-
MOTOR TERMINALS
W2
V2
U2
BRAKE
TERMINALS
R+
R-
MOTOR TERMINALS
W3
V3
U3
BRAKE
TERMINALS
R+
R-
JUMPER IS INSTALLED
IN CASE THERE IS
NO OPTION CABINET
SCR DIS/ENA TERMINAL BLOCKS
LOCATED IN RECTIFIER CABINET
OPTION CABINET DOOR FAN
RECTIFIER CABINET DOOR FAN
INVERTER CABINET DOOR FAN
INVERTER CABINET DOOR FAN
REGEN
TERMINALS
LOAD SHARE
TERMINALS
HEATSINK/DOOR
FAN TRASNFORMER
HEATSINK/DOOR
FAN TRASNFORMER
HEATSINK/DOOR
FAN TRASNFORMER
DOOR INTERLOCKS
PCA13
KLIXON IS INSTALLED IN CASE THERE IS AN OPTION CABINET
RFI KLIXON
A1
A2
C21 C22
C13 C14
WHT
WHT
WHT
BLK
BLK
BLK
CONTACTOR
DISCONNECT
6A
6A
6A
6A
H1
H2
X1
X2
LOCATED IN OPTIONS CABINET: CB AND CONTACTOR TERMINAL BLOCKS
LOCATED IN RECTIFIER CABINET: 400VA TRANSFORMER, FUSIBLE DISCONNECT AND 24V POWER
SUPPLY
SPLICE
LOCATED IN OPTIONS CABINET
CBL1
LOCATED IN RECTIFIER CABINET
LOCATED IN INVERTER
CABINET
T1
A2
A1
C21
C22
C13
C14
DS1
M1
CB1
Illustration 3.8 Intermediate and inverter sections
Internal Frequency Converte...
High Power Service Manual for Modular F Frame Drives
MG90K202 - VLT
®
is a registered Danfoss trademark
53
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