Onicon System-30 MODBUS BTU Manual do Utilizador descarregar pdf (Página 37)

11451 Belcher Road South, 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 37

4.9 COMMISSIONING

Please read all installation instructions carefully before proceeding. Wiring diagrams are located

in the appendix. A worksheet for checking off these steps and recording measured values is

located on the following page.

1. Conrm main unit

location and adequate

straight pipe run to

achieve desired results

Is the main unit located in the correct location as required by the plans?

Is the meter correctly oriented with respect to ow direction?

Compare actual straight pipe upstream and downstream of the main unit location

to the recommended distances identied in this installation manual. Note: This

manual is very conservative and assumes the worst-case pipe obstructions; contact

ONICON’s technical support department to discuss specics of your application

In order to proceed with the following steps, the System-30 must be operating and connected to the control

system. There must also be ow in pipes. Flow signal readings should be taken while holding the ow rate

constant if possible, otherwise, take the various output readings as quickly as possible.

2. Conrm correct supply

voltage

Verify that the correct supply voltage is available at the System-30 signal cable

connections. The System-30 BTU MEASUREMENT SYSTEM operates from 24 V

AC/DC.

3. With the HVAC system

active, verify that the

diagnostic LED’s for

FLOW and BTU are

both ashing.

The LED’s are located on the exterior of the main unit on the end opposite from the

cables.

The following steps require a multi-meter with the ability to measure DC voltage as well as DC frequency in hertz.

Remove the six screws that secure the cover to the main unit and carefully lift the cover off.

4. Check temperature

readings for T1, T2

and the differential

temperature

Set multi-meter for 2 to 4 volt range

T2: (TB2) Measure DC volts between terminals 2(+) and 3(-)

T3: (TB3) Measure DC volts between terminals 2(+) and 3(-)

Delta T: (TB2-TB3) Measure DC volts between terminals 2 and 2

The relationship between voltage and temperature is 10 mV/degree F.

Multiply the reading in volts by 100 to obtain degrees F.

Compare the calculated temperatures to expected values and to the values shown

on the network.

5. Check ow signal

Set multi-meter for DC hertz, voltage range > 15 volts.

The test points for ow are located next to the reset button.

GPM = Frequency in Hz X 60

Meter Factor in ppg (refer to calibration tag for meter factor)

Compare the calculated ow rate to expected values and to the values shown on

the network.

6. Check Energy Total

Output (BTU Output

Mode 1 and/or Mode 2)

Set multi-meter for ohms

Mode 1: Measure ohms between terminals 3 and 4

Mode 2: Measure ohms between terminals 5 and 6

Conrm that the voltage changes state (low to high or high to low) each time the

controls system register records a new energy total.

End of standard commissioning. Please contact ONICON’s technical service department at (727)447-6140 with

any questions.

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