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14 Unidrive M Regen Design Guide
Issue Number: 4
2.8.3 Multiple Regen, multiple motoring system
Figure 2-5 shows a multiple Regen drive system with multiple motoring drives. For this configuration the Regen drives are sized to the total power
requirement of all motoring drives. The multiple Regen configuration is only possible with Unidrive M modular drives in master / follower configuration.
For the multiple Regen and multiple motoring drives arrangement the required start-up circuit consists of a Unidrive M rectifier module (for example a
10404520 is capable of charging a maximum DC Bus capacitance of 70.2 mF).
Special care should be taken when designing a multiple Regen and multiple motoring drive system ensuring that all the required fusing is in place on
both the common DC bus connections and the AC supply to all Regen drives.
Figure 2-5 Multiple Regen, multiple motoring system
All drives paralleled must be of the same frame size, and a derating also applies in Chapter 3, section 3.3 Ratings on page 17.
DC Bus
Connections
U
V
W
Motor
Connection
-DC
+DC
U
V
W
Motor
Connection
-DC
+DC
U
V
W
Motor
Connection
-DC
+DC
U
V
W
Motor
Connection
-DC
+DC
U
V
W
Unidrive M
Master Regen Drive
-DC
+DC
U
V
W
Unidrive M
Follower Regen Drive
-DC
+DC
U
V
W
Unidrive M
Follower Regen Drive
-DC
+DC
U
V
W
Unidrive M
Follower Regen Drive
-DC
+DC
-DC
+DC
L3
L2
L1
Rectifier
Additional
Circuitry
Additional
Circuitry
Additional
Circuitry
L1
L2
L3
Unidrive M
Motoring Drive
Unidrive M
Motoring Drive
Unidrive M
Master Motoring Drive
Unidrive M
Follower Motoring
Drive
Regen
inductor
Additional
Circuitry
CAUTION
The internal EMC filter must be removed
from all drives in the regen system
(motoring and regen).
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