Control unit
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5
Figure 21. Location of the components in the control unit of MU3.
When delivered from the factory, the control unit of the AC drive contains the standard control-
ling interface - the control terminals of the control board and the relay board - unless other-
wise specifically ordered. In the following 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 ±10%, 1000mA) by connecting the exter-
nal power source between terminal #6 and GND, see chapter 5.3.2. This voltage is sufficient
for parameter setting and for keeping the control unit active. Note however that the values of
the measurements of the main circuit (e.g. DC-link voltage, unit temperature) are not available
when the mains is not connected.
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