Operation principle and hardware description 43
Control devices
Main disconnecting device
The unit must be equipped with a main switch-disconnector [Q1.1] or main circuit breaker
[Q1]. With this switch, you can isolate the main circuit of the drive from the power line.
WARNING! The switch does not isolate the input power terminals or the auxiliary
circuit from the power line. To isolate the input power terminals, open the main
breaker of the supply transformer and lock it to the open position.
Auxiliary voltage switch
The unit can be equipped with an auxiliary voltage switch [Q21]. Using the switch, you can
disconnect the auxiliary circuit from the power line.
Operating switch
The cabinet can be equipped with an operating switch [S21].
By default, the operating switch controls the unit as follows:
• The ENABLE/RUN position: The control program closes the main contactor [Q1.2] and
the supply module starts to rectify.
• The OFF position: The control program opens the main contactor [Q1.2] and the
supply module stops rectifying.
Emergency stop and emergency stop reset buttons
The cabinet can be equipped with an emergency stop button [S61] and an emergency
stop reset button [S62]. Pressing the emergency stop button activates an emergency stop
function of the unit. The button locks to open position automatically. You must release the
button before you can return to the normal operation. Before the restart, you also need to
reset the emergency stop circuit with the reset button.
Note: The customer is fully responsible for implementing and testing the functional safety
circuits according to the relevant legislation and acceptance testing regulations. The
functional safety option manuals give examples on implementing the safety circuits in
ACS880 multidrives.
The BCU control unit
The supply and inverter modules are controlled by BCU control units.
For more information, see chapter Control units of the drive on page 337.
The ACS-AP-x control panel
The ACS-AP-x is the user interface of the unit. With the control panel, you can:
• start and stop the unit
• view and reset the fault and warning messages, and view the fault history
• view actual signals
• change parameter settings
• change between local and external control.
The Run enable command at the digital input DI2 must be on (1) so that the supply module
can be started and stopped with the control panel in the local mode.
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