Use In A Potentially Explosive Atmosphere - GE RSTi-EP User Manual

2.3 Use in a Potentially Explosive Atmosphere

If RSTi-EP products are used in potentially explosive atmospheres, the following notes are also
applicable:
•
Staff involved in assembly, installation and operation must be qualified to perform safe
work on electrical systems protected against potentially explosive atmospheres.
•
The remote I/O-System RSTi-EP shall only be used in an area of not more than pollution
degree 2, as defined in IEC 60664-1.
•
For applications in potentially explosive atmospheres, the requirements according to IEC
60079-15 must be observed, in particular the housing enclosing the system must meet
the requirements of explosion protection type Ex n or Ex e and protection class IP54. The
IP54 enclosure must be accessible only by the use of a tool.
•
Sensors and actuators that are located in Zone 2 or in a safe zone can be connected to
the RSTi-EP station.
•
The ambient temperature range -20°C to +60°C shall not be exceeded.
•
When the temperature under rated conditions exceeds 70 °C at the conductor or conduit
entry point, or 80 °C at the contact, the temperature specification of the selected cable
shall be in compliance with the actual measured temperature values.
•
A stabilized 24V DC power supply with double or reinforced insulation shall be used.
•
When using modules EP-2714, EP-2814, and EP-1804 in explosive atmosphere:
o Device shall be installed in an environment free of condensation, corrosives and
conducting dusts.
o If the switching or input voltage exceeds 63V, a transient protection device shall be
provided that limits the transients to a peak voltage of 500V or less.
•
For EP-2714 (Relay Module) only:
o Since relays are subject to wear, it must be ensured, by appropriate maintenance
intervals, that the temperatures do not exceed the limits of temperature class T4.
Note: A contact resistance of more than 110 milli-ohm will be considered as a fault.
o Resistive Loads Only
•
For EP-2714 and EP-2814 Relay Modules:
o Transient protection shall be provided that is set at a level not exceeding 140% of the
peak rated voltage value at the supply terminals to the equipment.
•
A visual inspection of the RSTi-EP station is to be performed once per year.
•
If mounted in other directions than horizontal (reference mounting rail), restrictions to the
max. operating temperature, max. output currents may apply.
•
While explosive atmosphere is present:
o No electrical connection shall be separated in energized condition.
o The USB interface shall not be used.
o Dip-switches, binary-switches and potentiometers shall not be actuated.
•
Only power supplies with secure isolation shall be used.
•
Refer manufacturers manual.
GFK-2958E RSTi-EP User Manual
Chapter2: Safety
22