Control Unit - Honeywell SmartDrive HVAC Installation Manual

Variable frequency drive for heating, ventilation and air conditioning applications
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C
ONTROL UNIT
5.
C
ONTROL UNIT
The control unit of the drive consists of the control board and additional boards (option boards)
connected to the slot connectors of the control board.
1
When delivered from the factory, the control unit of the drive contains the standard controlling
interface - the control terminals of the control board and the relay board. On the next pages you
will find the arrangement of the control I/O and the relay terminals, the general wiring diagram
and the control signal descriptions.
The control board can be powered externally (+24VDC, 100mA, ±10%) by connecting the ex-
ternal power source to terminal #30, see page 46. This voltage is sufficient for parameter set-
ting and for keeping the control unit active. Note however that the measurements of the main
circuit (e.g. DC-link voltage, unit temperature) are not available when the mains is not connect-
ed.
4
2
3
Figure 40. Location of control unit components
Locations of essential control unit components:
1 = Control terminals of the control board
2 = Terminals of relay board
3 = Optional boards
4 = Jumper for digital inputs, see chapter
5.1.2.2
Honeywell
• 44
5

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