Ametek Drexelbrook DR7000 Series Manual de Instruções Suplementares - Página 15
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ELECTRICAL CONNECTIONS
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3.6 Ex d[ia] / Ex tD[iaD] equipment
3.6.1 General notes
Ex d[ia]- and Ex tD[iaD]-approved equipment have two separate compartments. The electronics
in the electronics block compartment are Ex ia / ExiaD-approved and the terminals
compartment is Ex d / Ex tD-approved.
Figure 3-3: Compartments in Ex d[ia]- and Ex tD[iaD]-approved equipment
1 Electronics block (Ex ia / Ex iaD) compartment
2 Terminal (Ex d / Ex tD) compartment
INFORMATION!
If you must open the electronics block compartment and remove the electronics blocks for
servicing, it is not necessary to disconnect the wires from the Ex d / Ex tD terminal.
INFORMATION!
The flamepath dimensions are better than the values specified in the International Standard
IEC 60079-1 (minimum length 14.5 mm and maximum gap 118
3.6.2 How to connect the electrical cables
Cable entries are supplied on customer demand. If you supply the cable entries, this part must
have a degree of ingress protection IP≥6x (IEC 60529).
WARNING!
Use only Ex d-approved cable entries and plugs for Ex d applications. Use only Ex tD-approved
cable entries and plugs for Ex tD applications.
Load resistor
• Connect the load resistor to the positive terminal of the power supply
• Ground the negative connection.
• If the load resistor has to be connected to the negative terminal, the loop resistance must not
be more than 250 ohms.
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DR7000 SERIES
µ
m).
DR7000-LM IECEX, EDO# 9-10-104, Issue# 1