Z-System – Zener Barriers
Operation
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Operation
Operation in the Non-Hazardous Area
Operation in Zone 2
For operation in the hazardous area observe the following warning messages
additionally.
Connecting Circuits
1. Ground the device. Use the integrated ground connection of the zener barrier
for grounding.
The conductor cross-section of the ground connection, using a copper
conductor, must be at least 4 mm
²
(12 AWG).
2. Connect the field circuit.
3. Connect the control circuit.
Danger!
Explosion hazard from wrong or missing grounding
Wrong or missing grounding can cause sparks. This can ignite the surrounding
potentially explosive atmosphere.
• Ground the device. Observe the grounding requirements for type of protection
Ex i according to IEC/EN 60079–14.
• Ensure that external ground connections exist, are in good condition, and are
not damaged or corroded.
Danger!
Explosion hazard from live wiring
If you connect or disconnect energized non-intrinsically safe circuits in a
potentially explosive atmosphere, sparks can ignite the surrounding atmosphere.
Only connect or disconnect energized non-intrinsically safe circuits in the
absence of a potentially explosive atmosphere.
Danger!
Explosion hazard from changing the fuse
The changing of the fuse under voltage can cause sparks. This can ignite the
surrounding potentially explosive atmosphere.
De-energize the device before changing the fuse.
Z-System
–
Zener Barriers