E300 Installation and Commissioning Guide
69
Issue Number: 1
If
Low Under Voltage Threshold Select
(
O13
) = On (1) and
Low Under Voltage Threshold
(
O14
) is reduced below the variable maximum level
VM_STD_UNDER_VOLTAGE[MIN], or
LV Supply Mode Enable
(
O12
) = On (1), an indication is stored in
Potential Drive Damage Condition
L73
)
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 4-24 Size 3 to 6 power circuit
The diagram below shows the state of
(
L19
). The control signal to the external contactor
Under Voltage Contactor Close Output
(
O15
)
and
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 4-25 Low under voltage control size 3 to 6
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.
U
V
W
AC power
supply
Low voltage
DC power
Drive with main AC power supply
& Low voltage DC supply
Main contactor
K1
K1
O15
Under voltage system
contactor closed
O16
Digital input routed to
parameter
(
)
O16
Digital output routed from
parameter
(
)
O15
Under voltage system
contactor output
Low voltage DC supply mode states for size 3 to 6
(3)
(4)
(2)
(2)
(
)
O15
(
)
O15
(1)
Drive Enable = OFF (0)
Drive Enable = On (0)
(
) DC link
J65
Voltage
(
)
O09
Active
Supply = 1
(
)
O09
Active
Supply = 1
(
)
O09
Active
Supply = 1
L19 Under Voltage Active
Upper Threshold Based On
(
)
O11
(
)
O14
Standard Under Voltage Threshold
Lower Threshold Based On
Low Under Voltage Threshold
(
) Under Voltage System
O15
Contactor Output = On (1)
Under Voltage System
Contactor Output = On (1)
Under Voltage System
contactor output = On (1)
Under Voltage System
Contactor Output = OFF (0)
(
)
O15
Содержание E300 Series
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