70
E300 Installation and Commissioning Guide
Issue Number: 1
2. If
DC Bus Voltage
(
J65
) is above the
Low Under Voltage Threshold
(
O14
), but below the
Standard Under Voltage Threshold
(
O11
), there are two
possible states depending on the Drive enable = On (1) or Off (0). If the Drive enable = Off (0) then
(
L19
) = On (1) the internal
charge system is active and
Under Voltage System Contactor Closed
(
O16
) = On (1) so the DC link can be charged by the high voltage AC
supply. If Drive enable = On (1) then
L19
) = Off 0) and the internal charge system is inactive so the drive can run from the low
Under Voltage Contactor Close Output
(
O15
) = Off (0), so it is not possible for the high voltage AC supply to charge the DC
link.
3. If
DC Bus Voltage
(
J65
) is above the
Standard Under Voltage Threshold
(
O11
) then
L19
) = Off 0) and
(
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
(
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).
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 4-26 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 4-27 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
U
V
W
AC Power
Supply
Low Voltage
DC Power
Drive with main AC power supply
& Low voltage DC supply
K1
O15
Under Voltage System
Contactor Closed
O16
Digital Input Routed
To (
)
O16
Digital Output Routed From (
)
O15
Under Voltage System
Contactor Output
Summary of Contents for E300 Series
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