TABLE 6-2 Non-FDS (Non-Fault Detection System) Troubleshooting
Symptom Transmitter Models Procedure
Yes No
7. Replace the glass output signal fuse with a fast-acting 0.125 A fuse. Move the power switch to the "ON"
position. Measure the output signal current or voltage as directed in steps 7 or 8 depending on the output
configuration of the transmitter. Is the measured output signal greater than 0 VDC (transmitters configured
for VDC output) or 4 mA (transmitters configured for mA output)?
8. CALL
8. There is most likely a problem with the control wiring or host control system. Check for shorts, extraneous
voltages (AC or DC) and/or other problems with the control wiring or the control system input circuit.
Resolve the problem before reconnecting the signal wire to the transmitter.
A problem with the control wiring or host control system may damage the transmitter and void warranty. Do
not reconnect the signal wires to the transmitter unless the problem has been resolved.
1. Are the airflow signal wires properly connected to output terminal block of the transmitter with terminal
screws secure with no shorts between wires (refer to the appropriate Wiring Guide for terminal
connections)?
3. 2.
“Live” wiring to transmitter may damage the transmitter and void warranty
These models have solid state fuses. Allow at least one minute between power cycles to allow the solid
state fuses to reset in the event they were in a fault condition.
2. Make sure the 24 VAC power source is not energized. Properly connect the airflow signal wires to the
output terminal block. Energize the 24 VAC power source. Is the airflow input signal at the host control
system > 0%?
DONE 3.
3. Make sure the 24 VAC power source is not energized. Remove the signal wire connected to the airflow
output terminal. Verify the airflow output signal configuration of the transmitter (Section 2). Configure your
VOM to measure VDC. Place the leads of the VOM is across the airflow output and common terminals.
Energize the 24 VAC power source. and wait for the transmitter to return to normal operation. Measure the
output signal voltage. Is the voltage greater than 0 VDC (2 VDC if the output is set to 2-10 V)?
4. CALL
4. There is most likely a problem with the control wiring or host control system. Check for shorts, extraneous
voltages (AC or DC) and/or other problems with the control wiring or the control system input circuit.
Resolve the problem before reconnecting the signal wire to the transmitter.
A problem with the control wiring or host control system may damage the transmitter and void warranty. Do
not reconnect the signal wires to the transmitter unless the problem has been resolved.
1. Simultaneously press the ESC and ↑ pushbuttons during normal operation to determine the setting for
AOUT. Is the AOUT parameter set to 4-20mA?
2. CALL
2. Use the ↑ and ↓ pushbuttons to select 0-10V (or 0-5V). Press the ENT pushbutton. Verify the output
jumper positions on the main circuit board for each output when prompted. Press the ESC pushbutton to
return to normal operation. Does the output go below 2 VDC (or 1 VDC when set to 0-5 V)?
DONE CALL
1. Simultaneously press the ESC and ↑ pushbuttons during normal operation to determine the setting for
AOUT. Is the AOUT parameter set to 2-10V?
2. CALL
2. Use the ↑ and ↓ pushbuttons to select 0-10V (or 0-5V). Press the ENT pushbutton. Press the ESC
pushbutton to return to normal operation. Does the output go below 2 VDC (or 1 VDC when set to 0-5 V)?
DONE CALL
EB-Flow2 Transmitter Model
EF-A2000
The host control system is configured for a 0-10
VDC (or 0-5 VDC) input and both of the output
signals from the transmitter will not go below 2
VDC (or 1 VDC).
A4 Transmitter Models
HTA104 and HTA202
EB-Flow2 Transmitter Model
EF-A2000
OUTPUT
Troubleshooting_Table6-2_r1o TABLE 6-2 │ Page 5 of 17
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