Troubleshooting; Faults And Warning Messages - Honeywell IAQPoint2 User Manual

Troubleshooting

Faults and warning messages

Faults are handled in different ways, depending on the configuration of the unit� 4-20 mA loops will
drop below 2�0 mA� The relay will de-energize�
Affected
Models
• •
• •
IAQPoint2 Troubleshooting Guide
Version
Symptom
All analog outputs
• •
produce 0 mA or
0 VDC
One or more
• •
analog outputs
are lower than
expected.
Diagnostic
Cause
Tests
Measure voltage
between terminals
T9 and T7 and
confirm that 20-30
VAC or 18-28VDC is
supplied.
External wiring
has an error.
(Non-display models
only) Confirm that
the LED on the right
side flashes for 5
seconds after power
is applied.
IAQPoint2 is
defective.
Confirm that
Internal 500 Ω
switches for volt/
load resistors
milliamp mode are
are improp-
in the desired posi-
erly switched in
tion as described in
circuit.
Figures 16 and 20.
Confirm continuity External equiment
in the external loop does not share a
with an ohmmeter. common ground.
Confirm voltage
between terminals
T7 and each of T4,
External imped-
T5 and T6 is less
ance is too high.
than 10.0 VDC while
the monitor is con-
nected.
IAQPoint2™
Solution
Provide 24 V AC/DC
power.
Replace.
Slide switches to
the correct position
as described in
Figures 16 and 20.
Rearrange external
circuit to have loops
as shown in Figure
9 or 10.
Rearrange external
current loop to have
R<=500 Ω.
47