BECKHOFF C9900-P223 - Manual (Page 6)

Foreword
4 C9900-P223 / C9900-P224
Basic safety measures
Use only with Beckhoff Industrial PCs
Note
The power supply unit must only be used in conjunction with Beckhoff
Industrial PCs!
Switch off the power supply of the system during installation!
Attention
During assembly, removal and electrical wiring of the power supply unit,
the power supply of the system must be switched off in order to prevent
damage on the power supply unit and the Industrial PC.
Items of equipment that have been switched off must be secured against
being switched on again.
Do not open the power supply unit while voltage is applied!
WARNING
The supply voltage must be switched off before the power supply unit
housing is opened.
Operator's obligation to exercise diligence
Only appropriately trained staff may install the power supply unit!
CAUTION
The operator must ensure that only appropriately trained electricians deal
with installation and wiring of the power supply unit.