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44 Unidrive M Regen Design Guide
Issue Number: 4
4.3.2 Single Regen, multiple motoring system using a Unidrive M Rectifier to support up to 8 % THD
v
Figure 4-5 Power connections: Single Regen, multiple motoring system
* Unidrive M Frame 11 and all new generation Inductors only.
Figure 4-5 shows both the power and control connections for the multiple
motoring Regen solution. For the multiple motoring system an external
charging circuit is required due to the additional capacitance from the
multiple motoring drives. The external charging circuit is interlocked with
the Regen drive enable to prevent operation with this circuit still
connected. In this example, the external charging circuit consists of a
Unidrive M Rectifier module. Refer to section 3.5 Unidrive M Rectifier on
page 23 for further details of the Unidrive M Rectifier.
For the multiple motoring drive solution, the Regen drive and associated
Unidrive M Rectifier must be sized to the total power requirements of all
motoring drives.
The rectifier uses the Regen inductor as line reactors. The rectifier may be
powered from the incoming supply using a standard line reactor if required.
UVW
L1 L2 L3 PE
-DC +DC
-DC
+DC
21
1
2 3 4 5 6 7 8 9 10 11 41 42
22 23 24 25 26 27 28 29 30 31
K2
L2
EMC
F1 F2 F3
VDR1
VDR2
VDR3
VDR4
VDR5
VDR6
Tc.1
L1
L2
L3
AC Supply
Connections
Motoring
drive DC
Connections
+24 output
Enable motor drive
Contactor closed
0 common
Drive enable
T. 30
T. 24
Rly.1
optional
L1
Unidrive M
Regen drive
S1
K1
Aux.2a
Unidrive M
Rectifier
L1
L2
L3
65
64
+DC
-DC
F12
F11
Regen inductor
thermistor
0V common
V
V
K2
AC Supply
Connections
NOT USED
Aux.3
S6
Drive OK
Reset input
Contactor
control
F13
F14
K3
Vsupply
Aux.2b
Aux.3
K3
Charging
branch
circuit
2a 2b
Aux
Vsupply
60
61
Cap bank A
Cap bank B
F15 F16 F17
Table 4-2 Key to Figure 4-5
Key Description
L1, L2, L3 Three phase supply
F1, F2, F3 Main Regen system supply fuses
VDR1, VDR2, VDR3 Varistor network line-to-line
VDR4, VDR5, VDR6 Varistor network line-to-ground
F7, F8, F9, F10
DC bus fusing to motoring drive
F11, F12
DC bus fusing to Regen drive
F13, F14
Rectifier DC fuse protection
EMC Optional EMC filter
CBA Switching frequency filter capacitor bank A
CBB Switching frequency filter capacitor bank B
L1 Switching frequency filter inductor
L2 Regen inductor
K1 Main supply contactor
K2 Regen drive main contactor
K3 Charging contactor
Aux.2a K2 NO auxiliary contact
Aux.2b K2 NC auxiliary contact
Aux.3 K3 NC auxiliary contact
Rly.1
Optional isolation for enable between Regen and motoring drive(s)
Mt.1 Motor thermistor 1
Mt.2 Motor thermistor 2
Tc.1 Regen inductor thermistor
+DC, -DC Motoring drive power connection to Regen drive
S1 Regen drive enable
S2 Motoring drive enable
S3 Motoring drive reset
S4 Motoring drive run forward
S5 Motoring drive run reverse
S6 Regen drive reset input (Pr 08.024 = Pr 10.033)
Vsupply System control supply
F15, F16, F17
Optional switching frequency filter capacitor fuses
Regen inductor thermistor must be configured to disable the
drive in the event of a thermal overload. The switching
frequency filter inductor thermistor must be configured to open
the main supply contactor in the event of a thermal overload.
This can be achieved through the use of an external thermal
protection device/relay.
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