2100-A
16
Wiring and Installation Continued.
RS422/485 Comms Signal Cabling.
(1)
Use only low capacitance, twisted pair, overall screened data cable. The cable must equal or better the following
specifications.
NOTE:
All cables are to be subject during manufacture to in-process spark testing @ 4kVrms.
All cables are to be tested between conductors and conductors to screen for 1min @ 1500Vrms.
(2)
Minimum cable pairs:
RS422 = 2. (Plus overall screen.)
RS485 = 1. (Plus overall screen.)
(3)
Take care not to stress or damage cables during installation.
(4)
Total length of trunk line, including spurs, is not to exceed 1200m without isolating boosters.
(5)
Terminating resistors -1k .
(6)
Cabling paths should avoid sources of radio frequency interferences such as fluorescent lights, variable speed
motor drives, welding equipment, radio transmitters, etc.
(7)
There should be a minimum of 200mm physical separation between power cables and data cables.
(8)
Data cables should not be exposed to excessive heat or moisture, and should not be buried directly in the ground
without protection.
(9)
Avoid powering a remote station or controller from the same power supply as a variable speed drive.
(10)
All unused twisted pairs should be terminated at both ends with 1k
resistors. DO NOT ground unused pairs.
Ethernet Cabling.
Category 5 (Cat 5) or better (eg Cat5e or Cat6) cable is required for 100Mbps fast Ethernet transmission. The 2100-NET
uses a standard RJ45 Connector.
2100-A
16
-NET or 2100-NET Ethernet Port.
When powering up the 2100-A
16
-NET or 2100-NET, with the Ethernet plug connected, the GREEN LED or the ORANGE
LED should light immediately, indicating a good network connection.
Cautions Using Differential Inputs.
All 2100-A
16
analogue inputs, mA, mV, V, T/C (except RTD) are differential. Exceeding 18V peak between any 2 inputs,
or any single input will cause errors on ALL channels. Failure to install a jumper on mA inputs will cause errors on ALL
channels.
Inputs can be changed from differential to single ended (referenced to 0V) by shorting ‘B’ ‘B’ terminals together. For
inputs with excessive noise and 3-wire AC valve motors this may help to stabilise the input signal. Use caution when
doing this, as unless the inputs are at the same potential large earth currents will flow through the 0V rail causing errors
on ALL channels. Refer to your distributor for more detailed information.
Where ground loops, excessive noise or excessive voltage is present between any two inputs, or on any single input,
suitable isolating transmitters are required, otherwise errors in signal readings will occur on ALL channels.
Cautions Using Analogue Outputs.
If the analogue outputs connect into non-isolated other units, it is recommended that suitable isolating transmitters be
used on the analogue outputs. Failure to use isolating transmitters to non-isolated other units which cannot reference
to AO COM will cause errors on ALL analogue outputs and inputs. (AO COM is the same potential as 0V.)
Analogue Signal Wiring.
(1)
All signal cables should be good quality overall screened INSTRUMENTATION CABLE with the screen earthed at
one end only.
(2)
Signal cables should be laid a minimum distance of 300mm from any power cables.
(3)
For 2 wire current loops, 2 wire voltage signals or 2 wire current signals, Austral Standard Cables B5102ES is
recommended. For 3 wire transmitters and RTDs Austral Standard Cables B5103ES is recommended.
(4)
It is recommended that you do not ground analogue signals and use power supplies with ungrounded outputs.
(5)
Lightning arrestors should be used when there is a danger from this source.
(6)
Refer to diagrams for connection information.
14.02-26
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