Communication And Networking; Configuration; Maintenance; Safety Instructions For Nvent Raychem Ngc-20-Cl-E - nVent Raychem NGC-20-C-E Installations-, Betriebs- Und Wartungsanleitung

2.5 Communication and networking

The NGC-20 controller is equipped with a RS485 interface. Through this interface up to 247 NGC-20 units can be networked to a
NGC-UIT2/TOUCH1500 or to one serial port of standard PC running nVent´ Windows based Supervisor software.

2.6 Configuration

The NGC-20 controllers can be configured locally by means of a handheld programming device (NGC-CMA2) or from a central location
using the NGC-UIT2/TOUCH1500 or Supervisor Software. After programming, all settings are permanently stored in the nonvolatile
memory of the NGC-20 control unit, avoiding loss of data in the event of power failure or after a long term power shutdown.

3. MAINTENANCE

Equipment placed into hazardous areas needs to comply with EN 60079-17 regarding inspection and maintenance requirements. The
EN 60079-17 describes in more detail the requirements regarding documentation, qualifications of personnel, inspections, regular
periodic inspections, continuous supervision by skilled persons, maintenance, isolation of apparatus, earthing and inspection schedules.
4. SAFETY INSTRUCTIONS FOR NGC-20-CL-E

4.1 Safety function of temperature limiter in NGC-20-CL-E

The application areas for (safety) temperature limiters can be found anywhere where there are thermal processes to be monitored,
and where the system must be set to a safe operating condition in the event of a fault. If the permitted temperature limit (Temperature
classification) is reached, or a fault occurs within the normal operating temperature (probe break/short-circuit, component defect, power
failure), then the instrument switches to the safe state without delay. If the fault is no longer present, then the safety temperature limiter
must be manually reset. This can be done either by means of the internal reset button inside the unit, The Supervisory Software or the
handheld programming device. The unit will only accept to be reset after the normal operating conditions have returned.

4.2 Area of use

Safety temperature limiters are required in all areas where thermal processes need to be prevented from overheating. In case of a
temperature upset they will put the system into a safe operating condition. The safety function will invoke in the event of a fault, when
the permissible temperature limit is reached or in case a fault occurs (such as probe break, probe short-circuit, component failure, or
supply failure) even when the process conditions are within the permissible temperature range. In all these cases the equipment is
immediately switched off. If the fault is no longer present, than the safety temperature function must be manually reset before the unit
goes back to normal operation. NGC-20-CL-E units can be reset by means of an internal push button or via dedicated software. The
output of the unit will only be enabled when all conditions are safe; meaning that the temperature measured by the limiter RTD has
dropped below the limiter set point and when there are no other faults being detected. In other words, the unit will only reset after the
normal operating conditions have returned.
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