System Configurations - Control Techniques Unidrive Installation Manual

4.6

System configurations

The following diagrams show different system configurations for a Unidrive SP
operating from a Low Voltage DC supply.
The choice of system configuration depends on the amount of regen energy the DC
supply can absorb.
4.6.1 System configuration 1
This system configuration is suitable for systems were the power supply cannot absorb
any energy from the load through the drive, hence the reason for blocking diode D1
being fitted in series with the DC supply.
Figure 4-1 System configuration 1 circuit diagram for Unidrive SP size 1 to 3
Aux.1
Ovld.1
Rdis
K1b K2d
L1
L2
3-phase
AC supply
L3
*C1 is only required with Unidrive SP size 1
See Chapter 5 Component data on page 30 for details on components.
14
K2a
D1
PS1
K2b
K2c
Control + 24V
external input
K1
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F2a
+DC
F2b
-DC
C1*
F2c
48V
F3
T2
T1
F1a
Unidrive SP Low Voltage DC Installation Guide
DC2/+DC
DC1/-DC
48V
Size 2 and 3
connections
Issue Number: 1