66 Unidrive M / HS Frame 7 to 10 Power Installation Guide
In low voltage mode only, with frame size 9 to 10, a 24 V supply needs to be provided for the heatsink
fan. The fan supply should be connected to terminal 61 and 62.
Figure 4-7 Location of the heatsink fan supply connector on size 9 to 10
4.6 Heatsink fan supply
When operating on normal mains supply the heatsink fan on all drive sizes is supplied internally by
the drive. When operating size 9 and 10 in low voltage mode it is necessary to connect an external
24V supply to terminal 61 and 62 if heatsink fan operation is required. Please see section 4.5 Low
voltage operation on page 65 for more details.
4.7 Ratings
See section 2.4 Ratings on page 17.
Maximum continuous input current
The values of maximum continuous input current are given to aid the selection of cables and fuses.
These values are stated for the worst case condition with the unusual combination of stiff supply with
high imbalance. The value stated for the maximum continuous input current would only be seen in
one of the input phases. The current in the other two phases would be significantly lower.
The values of maximum input current are stated for a supply with a 2 % negative phase-sequence
imbalance and rated at the maximum supply fault current given in section 2.4 Ratings on page 17.
The nominal cable sizes given in section 2.4 Ratings on page 17 are only a guide. Refer to local
wiring regulations for the correct size of cables. In some cases a larger cable is required to avoid
excessive voltage drop.
61 0V common
62 +24 Vdc heatsink fan supply
Size 9 to 10
Nominal operating voltage 24.0 Vdc
Minimum continuous operating voltage 23.5 Vdc
Maximum continuous operating voltage 27 Vdc
Current consumption Size 9 to 10 (all): 6A
Recommended power supply 24 V, 7 A
Recommended fuse 8A fast blow
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