Unidrive SP Low Voltage DC Installation Guide 27
Issue Number: 1 www.controltechniques.com
Safety Information Introduction Product information
System design
Component data Index
4.8 External soft start circuit control
As discussed in section 4.4 External softstart resistor on page 12 an external soft start
resistor is required for Unidrive SP size 4 and larger.
The soft start resistor only needs to be in circuit at certain times as shown in the flow
diagram below.
Figure 4-13 Soft start control circuit sequencing
The above sequencing can be achieved using the drive internal function blocks as
shown in Figure 4-14 on page 28.
Yes
Is the drive powered
from LVDC ?
(Read Pr
6.44
)
Yes
Is the drive in
UV state?
(Read Pr
10.16
)
No
No
Close the drive
relay
(soft start resitor
out of circuit)
Wait 2.5.s
Allow drive
enable
(write 1 to Pr
6.15
)
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