Hatteland HD 12T21 MMD, User Manual, Page: 37 / 108

Physical Connections
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POWER INPUT:
The internal AC power module supports both 115VAC/60Hz and 230VAC/50Hz power input. Please check
specifications for your unit.
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POWER INPUT:
Connect your DC power cable to the 2-pin Terminal Block 5.08 connector. The internal DC power module supports
24VDC. For more information, please review “Housing Connector Overview” earlier in this manual.
GROUNDING SCREW:
Note: DC models are required / recommended to be properly grounded via the screw located on the unit. Please
review “General Installation Chapter”, pt. 7 for more information.
Multi-power note: (For units supporting AC & DC input simultaneously)
The unit has a dual input power supply which will accept both AC and DC input. If both inputs are connected, the
unit will be powered by AC. If AC is disconnected it will automatically switch over to DC without affecting the operation
of the unit. This makes it possible to use AC power as primary power and a 24V battery as secondary power,
eliminating the need for expensive UPS systems.