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8024250/18HT/V2-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-G
Subject to change without notice
5
INSTALLATION
●
SICK AG recommends a tightening torque of 0.5 Nm for the screws of the screw
terminals (
see “Connecting the control unit”, page 45
●
The supplied control unit is completely wired. Do not change or manipulate this control
unit. Observe the wiring diagram when connecting the control unit.
●
Make sure the external grounding connections are present, in good condition, and not
damaged or corroded.
●
Observe the maximum possible conductor lengths in order to minimize power
dissipation.
5.10.1
Accessing the connection terminals
5.10.2
Instructions for the function of the spring-loaded terminal
Fig. 14: Connecting conductors, schematic diagram
5.10.3
Potential equalization, (PE, ground)
▸
Connect the external grounding connection on the enclosure parts of the control unit
and the supply unit (
see “ZIRKOR200 Ex-G Electrical connection plan (Ex-measuring
probe and Ex-enclosure)”, page 47
), analyzer electronics enclosure, pneumatic unit as
well as the optionally installed solenoid valves directly to the main potential (ground).
The required conductor cross-section is 4 mm².
WARNING:
Disconnect the power voltage from the system before removing the terminal cover.
Do not restore the power supply to the system until all enclosure covers have been
closed.
Live parts may not be accessible after installation.
▸
Follow steps 1 to 3 to connect the wires.
▸
For the spring-loaded terminal position,
“Connecting the control unit”, page 45
▸
step 1
step 3
step 2
1
Screwdriver
2
Conductor
3
Terminal strip