Hach-Lange SI794 C User Manual - Manual (Page 16)

16
Terminal Assignments
Fig.: si794 C terminal assignments
Installation and connection
Installation instructions
Caution!
Danger of electric shock!
Any work on the electrical installation may only be undertaken by
experienced and qualified personnel in accordance with the applicable
local safety regulations.
• Always disconnect power to the device when making any electrical
connections!
• Be sure to follow the instructions in the user manual!
• Only connect the power supply when all internal wirings have been
completed and the system is correctly grounded!
When using an external voltage supply, always connect a ground-fault
circuit interrupter (tripping current max. 30 mA) between mains and
controller system! A ground-fault circuit interrupter is not required
when safety extra-low voltages (24 V DC supply via rechargeable
batteries or 24 V DC/AC supply through an isolation transformer)!
When operating the system outdoors, connect a surge voltage
protection between mains and controller system!
The terminals are suitable for single wires and flexible leads up to
2.5 mm² (AWG 14). Attach end ferrules to the leads.