Electrical connection
CNGmass
20
Hauser
Safety Barrier Promass 100
A
Safe area
1
L+
2
L
27
26
A
B
Power
supply
24V
DC
Modbus
RS485
10
20
72
62
L+
L
A
B
Power
supply
Modbus
RS485
Hazardous area
Safety Barrier
Promass 100
Power
Communication
Lift panel for
bus termination
1
2
A
A0016922
5
Safety Barrier Promass 100 with terminals
1
Non-hazardous area and Zone 2/Div. 2
2
Intrinsically safe area
7.1.4
Shielding and grounding
The shielding and grounding concept requires compliance with the following:
• Electromagnetic compatibility (EMC)
• Explosion protection
• Personal protection equipment
• National installation regulations and guidelines
• Observe cable specification → 17.
• Keep the stripped and twisted lengths of cable shield to the ground terminal as short as
possible.
• Seamless cable shielding.
Grounding of the cable shield
To comply with EMC requirements:
• Ensure the cable shield is grounded to the potential matching line at multiple points.
• Connect every local ground terminal to the potential matching line.
NOTICE
In systems without potential matching, the multiple grounding of the cable shield causes
mains frequency equalizing currents!
Damage to the bus cable shield.
‣
Only ground the bus cable shield to either the local ground or the protective ground at one
end.
