nVent RAYCHEM RMM3 Bedienungsanleitung Seite 5

2. Installation of power supply and earth wiring
2.1 Select the voltage operating range
Connect the supplied wire jumpers to the appropriate terminals to
select input voltage.The RMM3 is supplied jumpered for
230 volts.
2.2 Connect wiring from power source to designated terminals
on RMM3.
Use only copper conductors. Connect power cable wires to
the terminals marked L and N on the RMM3. If power is being
daisy chained, be sure to maintain polarity of L and N wiring for
incoming and outgoing wires. The terminals accept stranded
wires from 0.2 – 2,5 mm . (0,2 - 4 mm
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3. Installation RTD cables
The RMM3 has terminals for 8 three-wire, RTDs (PT 100
temperature sensors, to IEC 751); do not use other types of RTDs.
Select RTDs appropriate for the usage:
MONI-PT100-NH Temperature sensor for
non-hazardous areas
MONI-PT100-EXE Temperature sensor for hazardous areas
RMM3 terminal no.
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APPENDIX A - modbus address setting
Each RMM3 connected to a NGC control and monitoring system
must have a unique address; if two RMM3's are assigned the
same address, communication faults will result. To ensure that
you assign a unique address to each RMM3 unit, do the following:
Review the NGC system layout; if a layout document does not
exist, create one. If it has not already been done, assign an RS-485
address to each RMM3 (up to 247).
If you are adding one or more RMM3 units to an existing NGC
network, confirm that the RS-485 addresses for existing RMM3
units correspond to the system layout. See for details the
programming guide of the NGC system.
By checking the RS-485 addresses on an existing system, you
can avoid potential conflicts that would be confusing and time
consuming to troubleshoot otherwise.
Record the RS-485 address selected for the Remote Monitoring
Module you are currently installing, and label the exterior of the
enclosure with the address assigned to the RMM3. For reference,
See for address range and hexadecimal address switch on page 6.
solid wire)
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Piping drawing identification
Install each RTD in accordance with the installation instructions
shipped with it, and run the RTD lead wires to the RMM3.
Note: Resistance of lead wires from each RTD must not exceed
20 Ω (e.g. 150 m with 3 x 1,5 mm
Each RTD connection is numbered; the number identifies the RTD,
and determines the order in which the NGC system displays the
RTD measurement. Therefore, order the RTD connections in a
manner that makes the NGC system display most meaningful.
The RMM3 cover shows the correct wiring arrangement for the
RTD wires. With nVent RAYCHEM RTDs, connect the two RTD lead
wires of the same colour to the terminals marked "–" and connect
the RTD lead wire that is a different colour to the + terminal.
4. Record the location/identification for each RTD.
Because the RMM3 terminal connection number identifies the
RTD in the NGC system, it is important to record the location
of each RTD. Use the space below to record the connections,
and label the RMM3 or its enclosure with this RTD identification
information.
Description or location
Do not make connections to the RS-485 bus while it is connected
to an operating NGC network. Damage and/or alarms could result.
The RS-485 bus allows units with unique addresses to be
connected together along a common bus. To add a new unit to
the network, simply connect the RS-485 bus from the last unit to
the new one, or insert the new unit between two existing units on
the bus. The order in which units are attached to the RS-485 bus
does not matter.
There are just two constraints on the RS-485 network:
Each must be assigned a unique address. See for address range
and hexadecimal address switch below.
The RS-485 bus must be a continuous string from the first
network device to the last RMM3 in the system.
Note: The RS-485 bus operates at 5 V, and equipment connected
to it could be damaged by exposure to higher voltages. Take
precautions to avoid exposing the RS-485 wiring to discharge
of static electricity or other sources of high voltage potential; in
particular, avoid contact with the power supply wiring.
cable).
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