Control Techniques Unidrive Installation Manual page 28

Figure 4-14 Soft start control circuit using drive internal logic
Under voltage
active
Healthy = 0
10.16
x(-1)
UV trip = 1
Normal high voltage
6.44
supply = 0
Low voltage DC
supply = 1
Table 4-6 Parameter set up required for Figure 4-14
Pr 9.04
Pr 9.05
Pr 9.06
Pr 9.09
Pr 8.27
Pr 9.14
Pr 9.15
Pr 9.16
Pr 9.17
Pr 9.20
The soft start control circuit provides the following functions:
• Opens and closes the external soft start relay contacts, which brings the external
soft start resistor in and out of circuit.
• Prevents the drive from running whilst the soft start resistor is in circuit (when in Low
Voltage DC mode only).
• Ensures that the drive DC bus has reached a voltage level in which the soft start
resistor can be taken out of circuit.
Figure 4-15 Logic function diagram
Under voltage active Pr 10.16
28
2.5s
delay
Parameter
Function 1 input 1 source parameter
Function 1 input 1 invert
Function 1 input 2 source parameter
Function-1 delay
Drive relay source
Function 2 input 1 source parameter
Function 2 input 1 invert
Function 2 input 2 source parameter
Function 2 input 2 invert
Function 2 destination parameter
Active supply Pr 6.44
Relay coil
Drive enable
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Internal to drive External to drive
0V
x(-1)
x(-1)
Disable = 0
Enable = 1
Default value
0.00
OFF(0)
0.00
0.0
10.01
0.00
OFF(0)
0.00
OFF(0)
0.00
2.5s
Unidrive SP Low Voltage DC Installation Guide
PS2
To drive +DC
41
42
Drive
From LVDC
enable
supply
6.15
Value to be entered
10.16
ON(1)
6.44
1.5
9.01
9.01
ON(1)
6.44
ON(1)
6.15
Low voltage DC supply
Normal high voltage
UV trip
Drive Healthy
Contact closed
Contact open
Enable
Disable
Issue Number: 1
F4
Rs