Control Techniques Unidrive Installation Manual page 23

Table 4-5 Key for Figure 4-7
Key
Aux.1
Aux.2
Aux.3
Ovld.3
Ovld.2
D1
Ovld.1
F1a
F2a
F2b
F2d
F3
K1
K1a
K1b
K2a
K2b
K2d
K2f
PS1
Rly1
Rdis
Rs
R_LVDC
R_norm
4.6.7 Control implementation for system configuration 2
In order to achieve the required
section 4.7 Power circuit control logic and sequencing on page 24. The circuitry shown
in Figure 4-7 and Figure 4-8 below are required.
Some of the circuitry shown in Figure 4-8 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 4-8 Control relays for system configuration 2
Enable
input
AC Supply
select
Aux.2
Aux.1
Unidrive SP Low Voltage DC Installation Guide
Issue Number: 1
Ovld.1 auxillary contact
Ovld.2 auxillary contact
Ovld.3 auxillary contact
Thermal overload relay for high voltage braking resistor
Thermal overload relay for low voltage braking resistor
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 mode enable input.
Fuse for drive control 24V external input
Normally open contacts supplying the drive with 3 phase AC when energized
Normally closed contacts supplying the 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
form 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
Normally open contacts which when closed bring R_LVDC into circuit
LVDC power supply
Softstart relay that brings the softstart resistor in/out of the DC supply circuit
DC bus discharge resistor
External softstart resistor
Low voltage braking resistor
High voltage braking resistor
Low Voltage DC
K1c
K2d
K3a K2e
Aux.3
K3b K1d
K4a
K5a
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Description
operation sequencing as detailed in
Key:
Drive
enable
K3
K4
K5
K1
K2
Timer Coil, Delay ON
Relay Coil
Normally Open Contacts
Normally Closed Contacts
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