Control Techniques Unidrive Installation Manual page 17

Table 4-3 Key for Figure 4-3
Key
Aux.1
D1
Ovld.1
F1a
F2a
F2b
F2d
F3
F4
K1
K1a
K1b
K2a
K2b
K2d
PS1
Rly1
Rdis
Rs
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
Enable
input
AC Supply
select
Aux.1
Unidrive SP Low Voltage DC Installation Guide
Issue Number: 1
Ovld.1 auxillary contact
Blocking diode to prevent energy from being returned to the LVDC supply
Thermal overload relay to protect the discharge resistor
3 phase AC supply fusing
Fuse for LVDC supply feed to drive +DC terminal
Fuse for LVDC supply feed to drive -DC terminal
Fuse for 24V LVDC mode enable input.
Fuse for drive control 24V external input
Fuse to protect Rs
Normally open contacts supplying the drive with 3 phase AC when energized
Normally closed contacts supplying the 24V LVDC mode enable terminal
Normally closed contacts that bring in the discharge resistor when the AC supply
is removed
Normally open contact, which when closed supplies the drive with the positive
feed from the LVDC power supply
Normally open contact, which when closed supplies the drive with the negative
feed from the LVDC power supply
Normally closed contacts that bring in the discharge resistor when the DC supply
is removed
LVDC power supply
Soft start relay that brings the soft start resistor in/out of the DC supply circuit
DC bus discharge resistor
External soft start resistor
K1c
Drive
K2d
enable
K3
K4
K3a K2e
K5
K3b K1d
K1
K4a
K2
K5a
www.controltechniques.com
Description
Key:
Timer Coil, Delay ON
Relay Coil
Normally Open Contacts
Normally Closed Contacts
17