Emerson Unidrive M702 - Low Voltage Operation; Heatsink Fan Supply

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58 Unidrive M702 User Guide
Issue Number: 3
Figure 4-12 Location of the 24 Vdc power supply connection on size 6
1. 24 Vdc power supply connection
Figure 4-13 Location of the 24 Vdc power supply connection on size 7
1. 24 Vdc power supply connection
Figure 4-14 Location of the 24 Vdc power supply connection on size 8
1. 24 Vdc power supply connection
4.6 Low voltage operation
With the addition of a 24 Vdc power supply to supply the control circuits,
the drive is able to operate from a low voltage DC supply with a range
from 24 Vdc to the maximum DC volts. It is possible for the drive to go
from operating on a normal line power supply voltage to operating on a
much lower supply voltage without interruption.
Going from low voltage operation to normal mains operation requires the
inrush current to be controlled. This may be provided externally. If not,
the drive supply can be interrupted to utilise the normal soft starting
method in the drive.
To fully exploit the new low voltage mode of operation, the under voltage
trip level is now user programmable. For application data, contact the
supplier of the drive.
The working voltage range of the low voltage DC power supply is as
follows:
Size 3 to 8
Minimum continuous operating voltage: 24 V
Minimum start up voltage: 23 V
Nominal continuous operating voltage: 24 V
Maximum over voltage trip threshold: 230 V drives: 415 V
400 V drives: 830 V
575 V drives: 990 V
690 V drives: 1190 V
4.7 Heatsink fan supply
The heatsink fan on size 3 to 8 is supplied internally by the drive.
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