Control Techniques Unidrive Installation Manual page 21

Table 4-4 Key for Figure 4-5
Key
Aux.1 Ovld.1 auxillary contact
Aux.2 Ovld.2 auxillary contact
Aux.3 Ovld.3 auxillary contact
Ovld.3 Thermal overload relay for high voltage braking resistor
Ovld.2 Thermal overload relay for low voltage braking resistor
C1 DC supply capacitor (SP1 only)
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
F2c Fuse for LVDC supply feed to drive 48v terminal
F3 Fuse for drive control 24V external input
K1 Normally open contacts supplying the drive with 3 phase AC when energized
K1b 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
K2a
the LVDC power supply
Normally open contact, which when closed supplies the drive with the negative feed
K2b
from the LVDC power supply
Normally open contacts which when closed supply the 48V terminal of the drive with
K2c
LVDC
K2d Normally closed contacts that bring in the discharge resistor when the DC supply is removed
K2f Normally open contacts which when closed bring R_LVDC into circuit
PS1 LVDC power supply
Rdis DC bus discharge resistor
R_LVDC Low voltage braking resistor
R_norm High voltage braking resistor
4.6.6 Control implementation for system configuration 2
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 4-5 and Figure 4-6 below are required.
Some of the circuitry shown in Figure 4-6 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 4-6 Control circuitry for system configuration 2
Enable
input
AC Supply
select
Aux.2
Aux.1
Unidrive SP Low Voltage DC Installation Guide
Issue Number: 1
K1c
K2d
K3a K2e
Aux.3
K3b K1d
K4a
K5a
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Description
Key:
Drive
enable
K3
K4
K5
K1
K2
Timer Coil, Delay ON
Relay Coil
Normally Open Contacts
Normally Closed Contacts
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