Onicon System-30 MODBUS BTU Manual de usuario descargar pdf (Pagina 38)

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System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345 Page 38

4.9.1 Commissioning Worksheet

Please read all installation instructions carefully prior to proceeding with these steps.

Wiring diagrams are located in the appendix. Use the following worksheet for checking

off the commissioning steps and recording measured values:

STEP TEST / MEASUREMENT S/N: S/N: S/N: S/N:

1. Meter location

Supply voltage veried

Verify diagnostic LED’s

are ashing

Note and record

temperature readings for

T1, T2 & delta T

Note and record ow

rate

Conrm contact closure

output operation for

Mode 1 & Mode 2

TROUBLESHOOTING GUIDE FOR ONICON SYSTEM-30 BTU MEASUREMENT SYSTEMS

NOTE: Also refer to the COMMISSIONING GUIDE located on the preceding pages.

REPORTED PROBLEM: POSSIBLE SOLUTIONS:

No Flow Signal/ Energy

Signal

(While hydronic system

is active)

• Verify 24 VAC / VDC supply voltage to the System-30.

• Verify correct wiring to the System-30 (see wiring diagram).

• Check turbine for clogging due to debris.

• If none of the above, double check hydronic system to

ensure that ow is really present in the line.

• NOTE: Flow meter function cannot be veried by blowing

on the turbine. The sensing system requires a conductive

liquid to operate.

Displayed Flow Rate too

high or too low

• Verify that System-30 isolation valves are fully open and

bypass valve is fully closed (if bypass is used).

• Check turbine(s) for debris.

• Verify supply voltages.

Displayed Temperature

too high or too low vs.

expected values.

• Verify that thermowell is inserted into the ow stream and

that the temperature sensor is completely inserted into the

thermowells.

Data not available at the

control system (Device

Ofine)

• Verify that the MAC address and device instance number are correct

and there are no address conicts.

• Verify that the receive LED is ashing on the MODBUS board. If the

receive LED is not ashing, look for an open connection in the

network cable. See Appendix to locate the receive LED.

• Verify that the Baud rate selected matches the network Baud rate.

(See section 4.5.)

• Verify that the polarity of the network connections is correct.

• If the meter is at the end-of-line, add a 120 ohm termination resistor

accross the network terminals.

• Press and release switch S-1 to reset the Btu meter.

For technical assistance, contact ONICON Incorporated at (727) 447-6140.

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Onicon System-30 MODBUS BTU Manual de usuario Pagina 38

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