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Hydran* 201i Instruction Manual
particularly important because all H201Ci Controllers in a local network share a
common reference with this link.
WARNING
3. Because the supervisory link is isolated electrically at both ends, use it rather than
the RS-485 link to cover long distances.
4. Electrical noise is one of the most important factors when selecting the location
and installing a modem.
5. If the analog outputs and relay contacts must be connected to a SCADA system, it
is recommended to install the H201Ci Controller near this system and use the
supervisory links to cover the distance between the H201Ti's and the H201Ci
Controller.
• Transmitting the information using a supervisory link requires only three
shielded pairs of wires (two pairs for the H201Ci-C).
• Transmitting the information between the H201Ci controller and the SCADA
system requires one RS-485 or RS-232 link cable and/or the following pairs for
each H201Ti:
-
Three pairs for the alarm contacts (High, High-High and system fail
alarms).
-
One or two pairs for the analog outputs.
• Because of its digital nature, the supervisory link provides better protection
against electrical noise.
6.3
Installation
To install the components of the Hydran 201i System, please consult the following parts
of this manual:
• Hydran 201Ti: See Chapter 7.
• Hydran 201Ci-C: See Chapter 8.
• Hydran 201Ci-1: See Chapter 9.
• Local network: See Section 10.5.
• Optional modem: See Section 10.6.
MA-033
Rev. 14.0, 12-Nov-18
Disconnect the power at the disconnect switch or circuit
breaker before making any electrical connections, and ensure a
proper ground connection is made before connecting line
voltage.
Failure to do so can result in property damage,
personal injury and/or death.
Page 93
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