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3
Operation
During 4/20 mA loop test (22 mA high) w/ Error on output
LED
SEQUENCE
POWER
G
SYSTEM
Y
Y
CALIBRATE
R
FAULT
R
mA FAULT
SOURCE
G
ATMOS
G
.5 mA Low Signal Output Test for
.5 mA Low Signal Output Test
.5 mA Low Signal Output Test
.5 mA Low Signal Output Test
Fault C C C C onditions
Fault
onditions
Fault
Fault
onditions
onditions
NOTE: The unit must be in the 4/20 mA loop (22 mA
high) test to proceed with this test.
STEP 2
Start: Press and hold the "zero" (S1) button for at
least one second or until the yellow "calibrate" LED
shows medium double blink. The yellow "system"
LED will remain off and the output should change to
.4 to .6 mA (4 to 6 mV).
If a problem exists on the output signal line, or the
output load is not within the specified range, the "mA
fault" LED will blink either before or upon activation of
this test.
If an error surfaces during this test only, the
possibility of cross-talk can exist on the signal line.
This is caused by resistive shorts to power or other
voltage sources that can raise the .5 mA target
current on the line. Moisture in the connector can
cause stray voltage to migrate from the 24V DC pin
over to the 4/20 mA signal line. Check connectors or
refer to the troubleshooting section or error code
analysis section for assistance.
Manning AirScan-iR Refrigerant Sensor
continued
OFF
N/A
N/A
N/A
for
for
for
19100 AirScan-iR-ind 05/2006 REVA Copyright © 2006 Manning Systems, Inc. All Rights Reserved.
During 4/20 mA loop test (.5 mA low)
LED
SEQUENCE
POWER
G
OFF
SYSTEM
Y
CALIBRATE
Y
FAULT
R
N/A
mA FAULT
R
N/A
SOURCE
G
N/A
ATMOS
G
N/A
During 4/20 mA loop test (.5 mA low) with Error
LED
SEQUENCE
POWER
G
Y
OFF
SYSTEM
CALIBRATE
Y
FAULT
R
N/A
mA FAULT
R
SOURCE
G
N/A
N/A
ATMOS
G
STEP 3
Exit: Press and hold the "zero" (S1) button for at least
one second or until the yellow "calibrate LED turns off.
The yellow "system" LED will resume the previous
state, either "filtered" or "non-filtered" output mode.
NOTE: In addition to test procedures initiated
manually, every 2 seconds SensorCheck
monitors several performance parameters of the
TM
AirScan
iR. A notification of .5 mA on the output signal
is transmitted if any of these parameters is not met.
TM
technology
20
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