Troubleshooting - Johnson Controls - LIT-12014081 - RA-1270 - Airflow Measuring Station - AFMS

RA-1270 Advanced Thermal Dispersion Fan Inlet Airflow and Temperature Measuring System Technical Bulletin

Brand
Johnson Controls
Product name
AFMS
Document type
Technical Bulletin
Document number
LIT-12014081
Revision date
2022-08-04
Language
English

The following table outlines troubleshooting steps for issues that you may encounter.

Table 1. Troubleshooting
Problem Possible cause Corrective action UI location and steps
Airflow reading does not match what T&B reports. The calibration steps are not complete. If fan array: use automatic calibration feature and use 1-point for a fixed speed fan, 2- or 3-point calibration for variable airflows.

Menu > Supervisor Menu > Fan Array Config > Fan Array Cal

Note: Follow setup steps.
If individual fans: use automatic calibration feature and use 1-point for a fixed speed fan, 2- or 3-point calibration for variable airflows.

Run Auto Cal.

Menu > Supervisor Menu > Fan Array Config > Field Cal Cfg

  1. Select Fan # = select required fan.
  2. Fcal Enable? = select ON.
  3. Use Calc’d Cal? = select YES.
  4. Run Auto Cal = follow setup steps.

Enter Gain and Offset.

Menu > Supervisor Menu > Fan Array Config > Field Cal Cfg

  1. Select Fan # = select required fan.
  2. Fcal Enable? = select ON.
  3. Use Calc’d Cal? = select NO.
  4. Manual Gain = enter user required value.
  5. Manual Offset = enter user required value.

Analog output flow does not match what T&B reports.

Note: The analog output is the fan sum value and cannot be configured for, or used as, an output for individual fans when installed as more than one air measurement station.
Design range high is not set correctly. Verify the appropriate device settings.

Menu > Operator Menu > Output Cal Menu > Design Range Hi

Use the UP or DOWN button to make changes.

Note: If a change was made to the fan diameter post-calibration, you require a new calibration.
User made a change to the fan diameter post-calibration or post-setting the design range high.
No display. No power. Verify the appropriate input power supply voltage selection to the 24 VAC transformer.  
With a multi-meter, verify the application of 24 VAC to the correct terminals.
Callout Description
A Input power 24 VAC
If LEDs near the processor chip flash, ensure that the ribbon cable is fully seated in the boards socket.
Callout Description
A Display cable
Number of monitor boxes shown is incorrect after application of power. Host to client network is not wired correctly or terminated on the wrong port.

Left to right pinout on board is shield, minus, plus, shield , minus, plus. Confirm polarity is correct.

Note:

Analog Out (AO), Probe Network, and BACnet ports on the primary use interchangeable connectors.

Callout Description
A BAS analog outputs
B BACnet MS/TP outputs
C Johnson Controls device network
Two client boxes may have the same addresses. Look at rotary dial on ancillary probes.
Note: Host is hard-coded and rotary setting has no effect.
Assign the correct address per fan client.
Callout Description
A Rotary address
Fan assignment error. Verify that the user fan assignment is correct.

Menu > Supervisor Menu > Fan Array Config

  1. Number of Fans = select required fan quantity.
  2. Sensor Per Fan = select number of sensors install for each fan.
  3. Set Fan Sensors = Select Fan #.
Note: Under the menu, the user must assign the fan number to the corresponding monitor box.
Monitor does not have power. Verify that all monitor boxes have 24 VAC and are online.

Menu > Supervisor Menu > Sensor Mgmt > Disp MON Status

Use the UP button to view the active monitors.

Note: If a monitor is present and online, verify that the monitor is assigned to the appropriate fan and communicating.
No BACnet communications with BAS. Network wires are not wired correctly or terminate on the wrong port.

Left to right pinout on board is shield, minus, plus, shield , minus, plus. Confirm polarity is correct.

Note:

Analog Out (AO), Probe Network, and BACnet ports on the primary use interchangeable connectors.

Callout Description
A BAS analog outputs
B BACnet MS/TP outputs
C Johnson Controls device network
Configuration is incorrect. Verify configuration parameters match what is required to communicate with the BAS.
Device serial number is not viewable. Client devices are internally mounted to the fan wall. Serial numbers are available through the host GUI for all connected devices.

Menu > Supervisor Menu > About Device > Enter

  1. Use the UP button to view active monitor firmware versions.
  2. When the required monitor displays, press Enter on the host to show the monitor serial number.
Note: If a monitor is present and online, verify that the monitor is assigned to the appropriate fan and communicating.
Detected number of sensors does not match the installed number. Cable assembly M8 connector is not fully installed. Ensure the correct installation of all sensor M8 connectors and a good electrical connection.
Callout Description
A Sensor M8 cable connection
B M8 mating connection
C Johnson Controls device internal
Normal operation display mode has an * in the upper left corner. Sensors assigned to a fan are not connected or responding. Verify that all monitor boxes have 24 VAC and are online.

Menu > Supervisor Menu > Sensor Mgmt > Disp MON Status

Use the UP button to view active monitors.

Note: If a monitor is present and online, verify that the monitor is assigned to the appropriate fan and communicating.
Ensure the correct installation of all sensor M8 connectors and a good electrical connection.
Callout Description
A Sensor M8 cable connection
B M8 mating connection
C Johnson Controls device internal
Monitors assigned to a fan are not connected or responding. Verify that the user fan assignment is correct.

Menu > Supervisor Menu > Fan Array Config

  1. Number of Fans = select required fan quantity.
  2. Sensor Per Fan = select number of sensors install for each fan.
  3. Set Fan Sensors = Select Fan #.
Note: Under the menu, you must assign the fan number to the respective monitor box.
Normal operation display mode has an ! in the upper left corner. Indicates that there are duplicate sensors assigned to the same fan number. Verify that the user fan and sensor assignments are correct.

Menu > Supervisor Menu > Fan Array Config

  1. Number of Fans = select required fan quantity.
  2. Sensor Per Fan = select number of sensors install per fan
  3. Set Fan Sensors = Select Fan #.
Note: Under the menu, you must assign the sensor number to the respective monitor box. A sensor can only be assigned to one location.
Normal operation display mode has an # in the upper left corner. Indicates that the number of sensors or monitors has changed since the last sensor scan. Verify that the user fan and sensor assignments are the same as originally installed.

Menu > Supervisor Menu > Fan Array Config

  1. Number of Fans = select required fan quantity.
  2. Sensor Per Fan = select number of sensors install for each fan.
  3. Set Fan Sensors = Select Fan #.
Note: Under the menu, you must assign the fan number to the respective monitor box.
Received an INPUT NOT SAVED Out of Range message during calibration. User entered a calibration point value greater than the Fan Diameter/SqFt setting.
Note: Operating range is 0 fpm to 10,000 fpm.
Verify that the user setting for the diameter enables a design range higher than the calibration values.

From the Calibration Menu:

Supervisor Menu > Fan Array Config > Fan Array Cal or Field Cal Cfg

  1. Fan Diameter = enter fan diameter for the application.
  2. Area Confirm = enter in custom user SqFt value if different from the calculated value from the fan diameter entry.
Note: The device reverse calculates the new fan diameter if you change the SqFt is changed. This also changes the design range high value as well for the analog output.