4 Chapter 4 - Control Operation. ABB ACS800 CraneDrive Control, ACC800 7.1

Chapter 4 – Control Operation

4.8 External 24V supply of RMIO board

To keep the control panel and the RMIO board active when the mains supply is switched off, a separate 24 Vdc supply can be connected. See

ACS 800 Hardware manual for details.

4.8.1 Power On Acknowledge input signal

If the CraneDrive is equipped with an external 24 V supply to RMIO board, it is recommended to connect a NO (Normally Open) auxiliary contact of AC power contactor to digital input for signal “Power On Ackn”, e.g. DI2. Input is selected with parameter 10.5. Drive is automatically reset at power on using the Power On Ackn input signal. Also a proper masking of Chopper fault and PPCC Link fault during power off, is achieved using the Power On Ackn signal.

A “0” on Power On Ackn input will generate an “Off” command of the

CraneDrive, that is: coast stop plus closing of mechanical brake.

No operation of CraneDrive is possible if Power On Ackn input is “0”!

NOTE: If using ACS 800 Multidrive, parameter 10.5 POWER ON ACKN

SEL should be set = DI2 !.

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