Omron VARISPEED L7 Manual page 230

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Example 3:
Two Batteries, Main battery voltage lower than 280 VDC.
Wiring
A
B
Main power
L1
Main
Battery
L2
L3
Controller
C
Supply Battery
Rescue Operation
Enable Input
The contactors must be operated, so that contactor B is always opened, before A and C are closed. Contactor C
can be closed after A but not before. When the rescue operation is disabled, the contactors A and C must be
opened, before B is closed.
Example 4:
Main battery voltage higher than 280 VDC.
Wiring
A
B
Main power
L1
Main
Battery
L2
L3
Rescue Operation
Enable Input
The contactors must be operated, so that contactor B is always opened, before A is closed. When the rescue
operation is disabled, the contactor A must be opened, before B is closed.
Rescue Operation Speed
During rescue operation the speed is limited by the battery voltage using the following formula:
for the 200 V class:
for the 400 V class:
If the rescue speed reference (d1-15) is higher than the rescue operation speed limit, the output frequency is
automatically limited to the calculated limit. It prevents a voltage saturation and a possible motor stalling.
Precautions
Because of the possibly low DC bus voltage during rescue operation, the heatsink cooling fans may not work.
A continuous operation under this condition can result in over heat faults and inverter damage.
Inverter
B2
B1
+2
+
1
R/L1
S/L2
T/L3
-
Control
Power Supply
circuit
P0
N0
Sx
SC
Inverter
B2
B1
R/L1
S/L2
T/L3
-
Control
Power Supply
circuit
P0
N0
Sx
SC
Rescue Operation Speed Limit
=
Rescue Operation Speed Limit
=
Contactor Sequence
Contactor B
Contactor A
Contactor C
U/T1
V/T2
W/T3
Contactor Sequence
Contactor B
Contactor A
U/T1
V/T2
W/T3
DC Bus Voltage L2-11 Base frequency E1-04
×
-------------------------------------------------------------------------------------------------------------------- -
×
300 V
2
×
DC Bus Voltage L2-11 Base frequency E1-04
--------------------------------------------------------------------------------------------------------------------- -
×
600 V
2
6
79
6-

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