Safety
information
Product
information
Mechanical
installation
Electrical
installation
Getting
started
User Menu A Commissioning
Advanced
Parameters
Diagnostics Optimization CT MODBUS RTU Technical Data
88 E300 Design Guide
Issue Number: 1
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
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
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
Drive Enable
Under Voltage System
Contactor Output
Under Voltage System
Contactor Closed
Soft Start Active
Under Voltage Active ( )
L19
O15
Under Voltage System Contactor Output
Is Not Set = On (1) Until The Soft Start Is Fully Active
Soft Start Cannot Change To Inactive State Until
Under Voltage System Contactor Closed ( )= OFF (0)
O15
()
O15
()
O16
AC Power
Supply
Low Voltage
DC Power
K1
O15
Under Voltage System
Contactor Closed
O16
Digital Input Routed
To ( )
O16
Digital Output Routed From ( )
O15
Under Voltage System
Contactor Output
To Next Page
Loading...
