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Safety
Product
Mechanical
information
information
installation
that cannot be cleared by the user. This effectively "marks" the drive so that if it is damaged as a result of an input current surge, this can be detected
by service personnel.
For size 7 drives and larger which use a DC link charge system based on a half controlled thyristor input stage, the charge system is activated based
on the level of the voltage at the AC supply terminals of the drive. The threshold for the charge system is set so that the rectified supply will give the
required under voltage threshold level. The under voltage system operates in exactly the same way as for size 6 drives and smaller.
Low Voltage Supply Mode Enable = On (1) Size 3 to 6 drives
LV Supply Mode Enable (O12). Low voltage supply mode is intended to provide a smooth transition without disabling the drive, from a high voltage
AC supply to a low voltage DC supply. It is necessary to disable the drive for the transition back to the high voltage AC supply from the low voltage DC
supply. 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.
Figure 4-23 Size 3 to 6 power circuit
AC power
supply
The diagram below shows the state of Under Voltage (L19). The control signal to the external contactor Under Voltage Contactor Close Output (O15)
and Active Supply (O09). When LV Supply Mode Enable (O12) = On (1) the maximum applied to Low Under Voltage Threshold (O14) prevents this
from being increased above Standard Under Voltage Threshold (O11) / 1.1 so that the 5 % hysteresis band on the low under voltage threshold does
not overlap the standard under voltage threshold.
Figure 4-24 Low under voltage control size 3 to 6
Upper Threshold Based On
(
O11
Lower Threshold Based On
(
O14
1. If the DC Bus Voltage (J65) is below the lower threshold the drive is in the under-voltage state and the internal charge system is active to limit the
charging current from either the low voltage DC supply or high voltage AC supply. Under Voltage Contactor Close Output (O15) = On (1), and so
it is possible for the high voltage AC supply to charge the link.
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 Under Voltage (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 Under Voltage (L19) = Off (0) and the internal charge system is inactive so the drive can run from the low
voltage DC supply. Under Voltage Contactor Close Output (O15) = Off (0), so it is not possible for the high voltage AC supply to charge the DC
link.
E300 Design Guide
Issue Number: 1
Electrical
Getting
User Menu A Commissioning
installation
started
Main contactor
K1
Low voltage
DC power
O15
K1
Under voltage system
contactor output
O16
Under voltage system
contactor closed
Drive Enable = OFF (0)
(3)
)
Standard Under Voltage Threshold
(2)
(
O15
)
Under Voltage System
Contactor Output = On (1)
)
Low Under Voltage Threshold
(1)
(
O15
)
Under Voltage System
contactor output = On (1)
L19 Under Voltage Active
Advanced
Parameters
Digital output routed from
parameter (
O15
)
Drive with main AC power supply
& Low voltage DC supply
Digital input routed to
parameter (
O16
)
Drive Enable = On (0)
(4)
(
O15
) Under Voltage System
Contactor Output = On (1)
(2)
(
O15
)
Under Voltage System
Contactor Output = OFF (0)
Low voltage DC supply mode states for size 3 to 6
Diagnostics Optimization CT MODBUS RTU Technical Data
U
V
W
(
O09 Active
)
Supply = 1
(
J65
) DC link
(
O09 Active
)
Supply = 1
Voltage
(
O09 Active
)
Supply = 1
87
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