Emerson E300 Series Design Manual page 423

Safety Product Mechanical
information information installation
To ensure that the soft-start is in the correct state to protect the drive and to ensure that the under-voltage condition is detected correctly the following
additional restrictions are applied:
1. The soft-start cannot change from the active state (i.e. internal soft-start contactor closed) unless the d.c. link voltage is above the upper under-
voltage threshold or Under Voltage System Contactor Closed (O16) = 1.
2. The Under Voltage Contactor Close Output (O15) parameter is set to 1 if the d.c. link voltage is above the upper under-voltage threshold or the
Final drive enable = 1. The Under Voltage Contactor Close Output (O15) is only set to 0 if the soft-start is fully active.
The following diagram shows how these restrictions apply to the system timing when Lower Threshold ≤ D.c. Bus Voltage (J65)
Soft-start cannot change to inactive state
until Under-voltage System Contactor
Closed (O16) = 0
(Frame sizes 07 and smaller and d .c. link voltage between the upper and lower under -voltage threshold )
Backup Supply Mode for frame size 07 drives and larger: (LV Supply Mode Enable (O12) = 1)
Backup supply mode is intended to provide a smooth transition, without disabling the drive, from a high voltage a.c. supply to a low voltage d.c.
backup supply and vice versa. The following diagram is a simple representation of the power circuit required. This does not include the necessary
circuit protection components or possible battery charger, etc.
O12
Mode
Minimum
Default
Type
Display Format
Coding
See Standard Under Voltage Threshold (O11). Also see User Supply Select (O10) for details of when and how drive parameters can be saved, and
when a PSU 24 V trip can occur.
O13
Mode
Minimum
Default
Type
Display Format
Coding
See Standard Under Voltage Threshold (O11). Also see User Supply Select (O10) for details of when and how drive parameters can be saved, and
when a PSU 24 V trip can occur.
E300 Design Guide
Issue Number: 1
Electrical Getting
User Menu A Commissioning
installation started
Under-voltage timing with Back-up Supply Mode Enable (O12) = 1
LV Supply Mode Enable
Open-Loop, RFC-A, RFC-S
0
0
1 Bit User Save
Standard
RW
Low Under Voltage Threshold Select
Open-Loop, RFC-A, RFC-S
0
0
1 Bit User Save
Standard
RW
Advanced
Diagnostics Optimization CT MODBUS RTU Technical Data
Parameters
Under-voltage System Contactor Close
(O15) is not set to one until the soft -start
is fully active
Maximum
1
Units
Update Rate Background read
Decimal Places 0
Maximum
1
Units
Update Rate Background read
Decimal Places 0
Final drive enable
Under-voltage
System Contactor
Close (O15)
Under-voltage
System Contactor
Closed (O16)
Soft-start active
Under-voltage
Active (L19)
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