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Internal Frequency Converte...
3.3.4 Brake Option
For frequency converters equipped with the dynamic brake
option, two brake IGBTs along with terminals 81(R-) and
82(R+) are included in each inverter module for connecting
3
3
an external brake resistor(s).
The function of the brake IGBT (see Illustration Brake
Option) is to limit the voltage in the intermediate circuit,
whenever the maximum voltage limit is exceeded. It does
this by switching the externally mounted resistor across
the DC bus to remove excess DC voltage present on the
bus capacitors. Excess DC bus voltage is generally a result
of an overhauling load causing regenerative energy to be
returned to the DC bus. This occurs, for example, when the
load drives the motor causing the voltage to return to the
DC bus circuit.
LOCATED IN RECTIFIER CABINET: 400VA TRANSFORMER, FUSIBLE DISCONNECT AND 24V POWER
SUPPLY
X1
H1
T1
BLK
WHT
X2
H2
400VA
TRANSFORMER
CBL20
+
WHT
BLK
WHT
CBL20
FOUR-POLE
FUSIBLE
DISCONNECT
RFI KLIXON
Fu1
Fu2
Fu3
Fu4
6A
6A
6A
6A
WHT
BLK
BLK
WHT
DIFF. MODE
FILTER
WHT
BLK
14 11 OF1
R
91
L1
S
92
L2
T
93
L3
DS1
GND
94
DISCONNECT
TB1
C1
WHT
MX
BLK
CB
CB1
Illustration 3.11 Brake option
56
DOOR INTERLOCKS
OPTION CABINET
RECTIFIER CABINET
INVERTER CABINET
DOOR INTERLOCK
DOOR INTERLOCK
DOOR INTERLOCK
GRN/YEL
-
-
+
-
+
+
24V AC/DC
POWER SUPPLY
BLK
WHT
BLK
WHT
WHT
BLK
2
2
1
1
CBL21
-
BLK
WHT
SPLICE
BLK
JUMPER IS INSTALLED
IN CASE THERE IS
NO OPTION CABINET
CBL1
2
2
1
1
BLK
BLK
2
2
WHT
WHT
1
1
KLIXON IS INSTALLED IN CASE THERE IS AN OPTION CABINET
106 104
WHT
RECTIFIER CABINET DOOR FAN
BLK
SCR DIS/ENA TERMINAL BLOCKS
LOCATED IN RECTIFIER CABINET
CBL2
BLK
A1/C2
RFI
WHT
WHT
BLK
LOCATED IN OPTIONS CABINET
OPTION CABINET DOOR FAN
CBL23
2
2
RED
BLK
1
1
U
3
3
WHT
DC
NOT USED
CBL1
BLK
BLK
1011
1
5
1 8
7 6
3
3
8
7
WHT
WHT
14-Pin
6-Pin
Aux 2
RFI/CAN/SCR DIS/ENA
INVERTER
Relay
DC-Link
-SCR
+SCR
RECTIFIER
R' S' T'
12-Pin
7 9 11
8 10 12
R
S
T
DIFF. MODE
DIFF. MODE
FILTER
FILTER
MAINS FUSES
FU1
FU2
FU3
M1
C13
C14
CONTACTOR
WHT
BLK
BLK
WHT
BLK
C21
C22
BLK
C2
C1 C2
WHT
A1
A2
A1
A2
C21 C22
C13 C14
WHT
LOCATED IN OPTIONS CABINET: CB AND CONTACTOR TERMINAL BLOCKS
SHUNT TRIP
MG90K202 - VLT
High Power Service Manual for Modular F Frame Drives
Placing the brake resistor externally has the advantages of
selecting the resistor based on application need,
dissipating the energy outside of the control panel, and
protecting the frequency converter from overheating if the
brake resistor is overloaded.
The Brake IGBT gate signal originates on the control card
and is delivered to the brake IGBTs via the MDCIC to each
inverter module power card and gate drive card.
Additionally, the power and control cards monitor the
brake IGBT and brake resistor connection for short circuits
and overloads.
FC-X02
CBL18
LCP
ANALOG I/O
RS-485
61 68 69
39 42
50
53 54 55
S
+
-
DIGITAL INPUTS
12 13
18
19
27
29 32 33 20 37
HEATSINK/DOOR
FAN TRASNFORMER
CBL9
WHT
RED
CBL3
CBL3
FAN-
L
FAN+
N
INVERTER CABINET DOOR FAN
GND
PE
FAN-
FAN+
GND
FAN-
L
FAN+
N
GND
PE
FAN-
FAN+
GND
INVERTER CABINET DOOR FAN
CBL4
CBL7
BLK
WHT
44
1
6
11 10 9
1
4
3
6
8
7
6
11 10 9
16-Pin
6-Pin
16-Pin
WHT
BLK
FU5
Aux 1
DC-Link
Aux 2
Aux 1
Relay
WHT
Relay
Relay
Not used
BLK
BLK
WHT
CBL7
RED
WHT
1
FU4
BLK
DC+
INVERTER 1
30
1
1
DC-
20
RED
R'
WHT
30
S'
T'
44
BLK
2 4 6
BRAKE
TERMINALS
R+
R-
W1
V1
MOTOR TERMINALS
U1
CBL8
®
is a registered Danfoss trademark
CURRENT
CURRENT
CURRENT
CBL19
SCALING
SCALING
SCALING
CARD
CARD
CARD
INV2
INV1
INV3
MDCIC CARD
1
44
1
FK100
FK102
44
1
44
1
FK103
44
FK101
MK101
CAN
6
5
4
BLK
WHT
RED
HEATSINK/DOOR
FAN TRASNFORMER
CBL10
WHT
BLK
BLK
RED
1
1
1
1
CBL3
CBL3
CBL3
BLK
BLK
WHT
NOT USED
44
1
4
3
6
1
1
4
11 10 9
8
7
6
6-Pin
WHT
6-Pin
16-Pin
FU9
FU7
DC-Link
DC-Link
Aux 2
Aux 1
Relay
Relay
BLK
RED
WHT
FU8
FU6
BLK
DC+
DC+
INVERTER 2
1
DC-
DC-
RED
RED
R'
R'
WHT
WHT
S'
S'
30
T'
T'
BLK
BLK
BRAKE
TERMINALS
R+
R-
W2
V2
MOTOR TERMINALS
U2
PCA13
MK102
CAN
3
2
1
6
5
4
3
2
1
LOAD SHARE
TERMINALS
LOAD SHARE
(UNIDIRECTIONAL)
LOCATED IN RECTIFIER CABINET
HEATSINK/DOOR
FAN TRASNFORMER
CBL11
BLK
RED
1
REGEN
TERMINALS
1
LOCATED IN INVERTER
CBL17
CABINET
WHT
NOT USED
3
6
44
1
8
7
6
11 10 9
16-Pin
Aux 2
Aux 1
Relay
Relay
INVERTER 3
1
30
BRAKE
TERMINALS
R+
R-
W3
V3
MOTOR TERMINALS
U3
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