User's Manual

Fuses
Electrical installation
Page 8
Figure 2 Fuses in 970 SmartRadar ATi
Caution
Safety depends on proper grounding. Check the resistance of the ground connection
directly after installation. The measured ground resistance shall be below the maximum
prescribed by local grounding requirements.
Warning
When measuring the ground resistance, use a suitable explosion-proof tester.
Preparing SmartRadar ATi for electrical installation
Mains supply, fuses and external mains switch
Mains supply for 970 SmartRadar ATi can be:
• 110 - 240 Vac 45/65 Hz, or
• 24 - 64 Vdc
Power rating : max. 25 VA (18 W).
Supply variations of +10% and -20% are allowed.
The 970 SmartRadar ATi is internally fused on the
primary side. Refer to figure 2.
Fuse values, in accordance with IEC 127-2-3, are:
• 1.6 A slow; I t value ≥ 10 A s for AC
22
supply
• 2 A slow; I t value ≥ 25 A s for DC supply
22
Install an explosion-proof mains switch in the
mains supply cable to each 970 SmartRadar ATi.
Specify which switch you need to operate the
SmartRadar.
Grounding
The SmartRadar ATi housing should be properly grounded to the ground reference
(generally the tank). This is a safety grounding requirement.
For this purpose, the SmartRadar ATi has an external ground terminal.
Note:
Grounding shall be performed in accordance with local regulations.