BECKHOFF CP66xx - Manual (Page 5)

General Notes
Basic safety measures
Switch off all parts of the equipment, then uncouple the fieldbus
Attention
Before opening the control panel housing, and whenever the control panel
is not being used for control purposes (such as during functional checks
after a repair), all parts of the equipment must first be switched off, after
which the control panel is to be disconnected from the equipment.
Disconnect the device by unplugging the connectors on the Control Panel
side.
Items of equipment that have been switched off must be secured against
being switched on again.
High Voltage!
DANGER
Displays used for the control panel’s LC-display are operated with a
voltage of up to 1000 V, depending on type. For that reason:
The supply voltage must be disconnected before the housing of the
Control Panel is opened.
Avoid assembly work during operation
Attention
Assembly work on the Control Panel during operation may damage the
panel:
• if metal objects such as screws or tools fall onto operating circuit
boards
• if connecting cables internal to the control panel are removed or
inserted during operation.
CP66xx 3