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Unidrive M / Unidrive HS Modular Installation Guide
Issue Number: 5
6.7 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 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 9 to 11
Minimum continuous operating voltage: 26 V
Minimum start up voltage: 32 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
It is not possible to supply Unidrive M/Unidrive HS size 9E/T, 10E/T and 11E/T drives with DC due to the lack of an accessible negative DC terminal.
In low voltage mode only, with frame size 9 to 11, a 24 V supply needs to be provided for the heatsink fan. The fan supply should be connected to
terminal 61 and 62.
Figure 6-17 Location of the heatsink fan supply connector on size 9 to 11
6.8 Status LED
6.8.1 Master status LED
•
1 flash / second: Trip condition
•
Continually ON: Healthy
6.8.2 Rectifier status LED
•
Continually ON: indicates that the rectifier has not been initialized by the inverter, i.e. there is no communication between them.
•
A flashing LED: indicates a rectifier fault.
NOTE
61
0V common
62
+24 Vdc heatsink fan supply
Size 9 to 11
Nominal operating voltage
24.0 Vdc
Minimum continuous operating voltage
23.5 Vdc
Maximum continuous operating voltage
27 Vdc
Current consumption
Size 9 to 11 (all): 6A
Recommended power supply
24 V, 7 A
Recommended fuse
8A fast blow
6 6
1 2
1
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