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installation
3. If DC Bus Voltage (J65) is above the Standard Under Voltage Threshold (O11) then Under Voltage (L19) = Off (0) and Under Voltage System
Contactor Closed (O16) = On (1), so the drive can run from the high voltage AC supply.
4. If DC Bus Voltage (J65) subsequently falls below the Standard Under Voltage Threshold (O11) and the Drive enable = On (1), the drive can
continue to run, but Under Voltage System Contactor Closed (O16)= Off (0) to open the high voltage AC supply contactor. The DC link voltage will
fall until it reaches the low voltage DC supply level. This gives a smooth changeover to the backup supply without stopping the motor.
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 unless the DC link voltage is above the upper under voltage threshold or Under Voltage System
Contactor Closed (O16) = On (1).
2. Under Voltage Contactor Close Output (O15)= On (1) if the DC link voltage is above the upper under voltage threshold or Drive enable = On (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 ≤ DC Bus Voltage (J65).
Figure 4-25 Low under voltage timing size 3 to 6
Soft Start Cannot Change To Inactive State Until
Under Voltage System Contactor Closed (
Sizes 3 to 6 under voltage timing with O12 Low voltage supply mode = On (1)
DC link voltages between O11 Standard under voltage threshold and O14 Low under voltage threshold
Low Voltage Supply Mode Enable = On (1) Size 7 Drives
Low voltage mode is intended to provide a smooth transition, without disabling the drive, from a high voltage AC supply to a low voltage DC 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.
Figure 4-26 Size 7 power circuit
AC Power
Supply
Low Voltage
DC Power
88
Electrical
Getting
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O15
)= OFF (0)
O15
Digital Output Routed From (
K1
Under Voltage System
Contactor Output
Digital Input Routed
To (
O16
O16
Under Voltage System
Contactor Closed
Advanced
Diagnostics Optimization CT MODBUS RTU Technical Data
Parameters
O15 Under Voltage System Contactor Output
Is Not Set = On (1) Until The Soft Start Is Fully Active
O15
)
Drive with main AC power supply
& Low voltage DC supply
)
Drive Enable
(
O15
)
Under Voltage System
Contactor Output
(
O16
)
Under Voltage System
Contactor Closed
Soft Start Active
Under Voltage Active (
L19
)
U
V
W
E300 Design Guide
Issue Number: 1
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