ONICON System-30 MODBUS BTU - Manual (Page 38)

11451 South Belcher Road, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]
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
2. Supply voltage verified
3. Verify diagnostic LED’s
are flashing
4. Note and record
temperature readings for
T1, T2 & delta T
5. Note and record flow
rate
6. Confirm 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 flow is really present in the line.
• NOTE: Flow meter function cannot be verified 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 flow stream and
that the temperature sensor is completely inserted into the
thermowells.
Data not available at the
control system (Device
Offline) • Verify that the MAC address and device instance number are correct
and there are no address conflicts.
• Verify that the receive LED is flashing on the MODBUS board. If the
receive LED is not flashing, 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.