Control Techniques Unidrive Installation Manual page 15

Table 4-2 Key for Figure 4-1
Key
Aux.1
C1
D1
Ovld.1
F1a
F2a
F2b
F2c
F3
K1
K1b
K2a
K2b
K2c
K2d
PS1
Rdis
4.6.2 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 4-1 and Figure 4-2 below are required.
Some of the circuitry shown in Figure 4-2 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 4-2 Control circuitry 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
DC supply capacitor (SP1 only)
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 LVDC supply feed to drive 48V terminal
Fuse for drive control 24V external input
Normally open contacts supplying the drive with 3 phase AC when energized
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 open contacts which when closed supply the 48V terminal of the drive
with LVDC
Normally closed contacts that bring in the discharge resistor when the DC supply is
removed
LVDC power supply
DC bus discharge resistor
K1c
K2d
K3
K4
K3a K2e
K5
K3b K1d
K1
K4a
K2
K5a
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Description
Key:
Drive
enable
Timer Coil, Delay ON
Relay Coil
Normally Open Contacts
Normally Closed Contacts
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