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13.2.3 No Communication between the Host Computer and the Network
of Hydran 201i Systems
1. Connect the host computer to each Hydran 201Ci Controller and perform the
tests listed in Section 13.2.2 above.
2. Verify all RS-485 local network link cables.
3. Disconnect all RS-485 link cables and "rebuild" the network, one H201Ci Controller
at a time. See Section 8.2.3.
13.3 Hydran 201Ci Controller's Display is Blank
1. If the fail alarm is triggered (and the analog outputs have dropped to 4.00 ± 0.10
mA), read the alarm message on the Hydran 201Ti's display to identify the cause
of the alarm. Then see Section 13.1.
2. Verify the fuse(s) and power supply of the H201Ci Controller and H201Ti.
3. Verify the connections of the TDM signal at both ends of the supervisory link
cable.
4. Verify the operation of the H201Ci Controller's display.
13.4 Hydran 201Ti and Hydran 201Ci Controller's Analog
Outputs at Zero
1. If the fail alarm is triggered (the H201Ci Controller's display is blank and the
analog outputs have dropped to zero), read the alarm message on the H201Ti's
display to identify the cause of the alarm. Then see Section 13.1.
2. Verify the fuses and power supply of the H201Ci Controller and H201Ti.
3. Verify the connections of the TDM signal at both ends of the supervisory link
cable.
4. Verify the H201Ti's analog output circuit by setting the H201Ti's AnalogMode
parameter (Relays/Analog;Analog Out submenu; see Section 5.5.7.4) to Force
50% or Force 100%. Verify the result via the Hydran Host software or the SCADA
system.
5. Verify the H201Ci Controller's analog output circuit by setting the H201Ti's TDM
Mode parameter (Relays/Analog;TDM Out submenu; see Section 5.5.7.5) to Force
50% or Force 100%. Verify the result via the Hydran Host software or the SCADA
system.
Page 190
Hydran* 201i Instruction Manual
MA-033
Rev. 14.0, 12-Nov-18
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