Unidrive SP Low Voltage DC Installation Guide 17
Issue Number: 1 www.controltechniques.com
Safety Information Introduction Product information
System design
Component data Index
Table 4-3 Key for Figure 4-3
4.6.3 Control implementation for system configuration 1
In order to achieve the required Low Voltage DC operation sequencing as detailed in
section 4.7 Power circuit control logic and sequencing on page 24. The circuitry shown
in Figure 4-3 and Figure 4-4 below are required.
Some of the circuitry shown in Figure 4-4 can be reduced by using SM-Applications, this
is further discussed in section 4.7.2 Control implementation using SM-Applications on
page 26.
Figure 4-4 Control relays for system configuration 1
Key Description
Aux.1 Ovld.1 auxillary contact
D1 Blocking diode to prevent energy from being returned to the LVDC supply
Ovld.1 Thermal overload relay to protect the discharge resistor
F1a 3 phase AC supply fusing
F2a Fuse for LVDC supply feed to drive +DC terminal
F2b Fuse for LVDC supply feed to drive -DC terminal
F2d Fuse for 24V LVDC mode enable input.
F3 Fuse for drive control 24V external input
F4 Fuse to protect Rs
K1 Normally open contacts supplying the drive with 3 phase AC when energized
K1a Normally closed contacts supplying the 24V LVDC mode enable terminal
K1b
Normally closed contacts that bring in the discharge resistor when the AC supply
is removed
K2a
Normally open contact, which when closed supplies the drive with the positive
feed from the LVDC power supply
K2b
Normally open contact, which when closed supplies the drive with the negative
feed from the LVDC power supply
K2d
Normally closed contacts that bring in the discharge resistor when the DC supply
is removed
PS1 LVDC power supply
Rly1 Soft start relay that brings the soft start resistor in/out of the DC supply circuit
Rdis DC bus discharge resistor
Rs External soft start resistor
To Next Page
Loading...
Need help?
General
