Nidec Unidrive M600 Series - Page 46

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46 Unidrive M Regen Design Guide
Issue Number: 4
4.3.3 Single Regen, multiple motoring system using an external softstart resistor to support up to 8 % THD
v
Figure 4-6 Power connections: Single Regen, multiple motoring system
* Unidrive M Frame 11 and all new generation Inductors only.
Figure 4-6 shows both the power and control connections for the multiple
motoring Regen solution. For this multiple motoring system solution 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. For
sizing of the external charging circuit required for the multiple motoring drive
system, refer to Chapter 11 Component sizing on page 308. For details on
softstart resistors and protection refer to section 10.4.5 Switching frequency
filter capacitors on page 299.
For the multiple motoring drive solution, the Regen drive and associated
external components must be sized to the total power requirements of all
motoring drives.
The Regen inductor core losses are directly dependant on the switching
frequency and specific core material and therefore selection is critical. As a
result only Regen inductors specified in this guide should be used.
EMC
VDR1
VDR2
VDR3
VDR4
VDR5
VDR6
F1 F2 F3
L1
L2
L3
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
K1
Tc.1
AC Supply
Connections
Motoring
drive DC
Connections
+24 output
En ble motor drive
Contactor closed
0common
Drive enable
T.30
T.24
Rly.1
optional
Unidrive M
Regen drive
S1
Aux.1a
Regen inductor
thermistor
0V common
V
V
a
S6
Aux.2
Driv
e
Reset input
Contactor
control
AC Supply
Connections
NOT USED
Vsupply
F8
F9
L2
L1
OK
Aux.1a Aux.1b
+24 V supply
K2
Vsupply
Aux.OPD1
Aux.1b
Aux.Rs.1
Aux.Rs.2
K1
K2
Aux.2a
Aux.3 OPD1
Rs.1
K3
Aux.2b
Charging branch circuit
Cap bank A
Cap bank B
F13 F14 F15
Table 4-3 Key to Figure 4-6
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
F4, F5, F6, F7 DC bus fusing to motoring drive
F8, F9 DC bus fusing to Regen drive
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 Pre-charge contactor
OPD1 Overload protection device for Rs.1
Aux.1a K1 NO auxiliary contact
Aux.2 K2 NO auxiliary contact
Aux.1b K1 NC auxiliary contact
Aux.OPD1 OPD1 NO 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
Rs.1 Softstart resistor 1
+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)
K3 Charging contactor
Aux.3 SFF capacitor auxiliary contact
Vsupply System control supply
F13, F14, F15 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.
Table 4-3 Key to Figure 4-6
Key Description
NOTE
NOTE
WARNING