Troubleshooting - OJ Electronics Air2 Fan IO21 Bedienungsanleitung

converter. The "Operation relay" output should
be connected to terminals 4 & 5. Electrical con-
nections are illustrated in fig. 8.
Modbus RTU outputs
OJ Air2 Fan IO21 is equipped with four RJ12
connectors (see fig. 6) for connecting Direct
Modbus actuators, damper motors and valve
motors.
Analogue output
OJ Air2 Fan IO21 is equipped with one
0-10 V DC analogue output which can be used,
for example, to control the speed of a frequency
converter. The 0-10 V DC control signal should
be connected to the "0-10 V OUT" output on
terminals 6 & 7. Electrical connections are il-
lustrated in fig. 8.
TECHNICAL DATA
Supply voltage ............................24 V AC +/- 15%
via terminals (13 & 14), max. 3500 mA
Electrical connections .....................max. 1.5 mm²,
Modbus connection ...........................6 x RJ12 6/6
top entry connectors
Modbus protocol ..............38.4 kbaud, 1 start bit,
8 data bits, 1 stop bit
Measuring range, pressure ................. 0/2500 Pa
Digital input,
for alarm from FC ...................... 1 x potential-free
Pressure inputs ..............................2 x 0-2500 Pa.
Temperature inputs ............................. 2 x PT1000
Digital relay output ........... 1 x potential-free relay,
max. 2 A/30 V DC
Analogue output,
for controller, e.g. EC ......................1 x 0-10 V DC
Ambient temperature, operation .......... -20/+40°C
(transient -30/+50°C)
Ambient temperature, storage .............-50/+70°C
Air humidity, non-condensing ............. 10-95% rh
Max. altitude ........................................... 1300 m
Transducer accuracy
@ -20/+40°C ..............................0.5% MV +2.5 Pa
(MV = measured value)
Pressure transducer max. pressure ......... 20 kPa
Power consumption ...... max. 2.5 VA (-20/+40°C)
Dimensions ........................... 165 x 110 x 70 mm
Modbus cable dimension ....................... MPFK6S
Pressure tubes ................................. 4 x Ø6.2 mm
Enclosure rating ............................................ IP54
Enclosure dimensions ............ 169 x 139 x 71 mm
Enclosure material ..............................ABS HI 100
Weight .......................................................... 320 g
LED INDICATORS
OJ Air2 Fan IO21 is equipped with one green
and one red LED which indicate operating
status.
LED ON
GREEN LED Power ON
RED LED No Modbus
communication
2

TROUBLESHOOTING

Symptom
Green LED not lit
Red LED lit
Negative measured value
(pressure, Pa)
Deviation in measured values
(pressure, Pa)
screw terminals
Zero point deviation (pres-
sure, Pa)
No data from sensor inputs
(temp. °C)
Sensor inputs show incorrect
values (temp. °C)
No voltage on 0-10 V DC
output
No signal on digital output
or similar
No signal on digital input
Constant signal on digital
input
Damper motor inoperative
FLASHING
Modbus OK
I/O alarm
Valve motor inoperative
Cause
No power supply
Defective OJ Air2 Fan IO21
Modbus connection broken/
short-circuited
Incorrect address
Incorrect communication speed Set correct communication: 38.4 kbaud, 1 start bit, 8
Defective OJ Air2 Fan IO21
Tubes interchanged
Defective OJ Air2 Fan IO21
OJ Air2 Fan IO21 subjected to
temperatures outside the speci-
fied temperature range
No or reduced flow through
pressure measurement tubes
Zero pressure at measuring
points
Defective OJ Air2 Fan IO21
Zero calibration not carried out
Defective OJ Air2 Fan IO21
Sensor circuit broken
Sensor circuit short-circuited
Incorrect sensor type
Defective OJ Air2 Fan IO21
Incorrect sensor type
Defective OJ Air2 Fan IO21
Interchanged polarization
Lacking signal from controller
Signal circuit broken
Defective OJ Air2 Fan IO21
Lacking signal from controller
Signal circuit short-circuited
Signal circuit broken
Defective OJ Air2 Fan IO21
Signal circuit broken
Defective OJ Air2 Fan IO21
Signal circuit short-circuited
Defective OJ Air2 Fan IO21
Incorrect damper motor type
Address incorrectly set on
damper motor
Lacking signal from controller
Modbus connection short-
circuited
Modbus connection broken
Defective OJ Air2 Fan IO21
Incorrect valve motor type
Address incorrectly set on valve
motor
Lacking signal from controller
Modbus short-circuited
Modbus disconnected
Defective OJ Air2 Fan IO21
© 2015 OJ Electronics A/S
Action
Check power supply
Check electrical connections
Check connectors
Replace OJ Air2 Fan IO21
Check electrical connections along entire length of
Modbus
Set correct Modbus address on OJ Air2 Fan IO21 ad-
dress selector, see fig. 11
data bits, 1 stop bit, no parity
Replace OJ Air2 Fan IO21
Exchange tubes on plus (+) and minus (-) tube connec-
tors, see fig. 4
Replace OJ Air2 Fan IO21
Bring ambient temperature into line with that specified
in these instructions, see technical data
Check that pressure measurement tubes are correctly
fitted
Start fan
Replace OJ Air2 Fan IO21
Depressurise OJ Air2 Fan IO21, if necessary by remov-
ing both pressure tubes, and carry out zero calibration.
Zero calibration is performed via Modbus register 1,
address 0X000, external calibration.
Replace OJ Air2 Fan IO21
Check electrical connections
Check electrical connections
Replace sensors with type: PT1000
Replace OJ Air2 Fan IO21
Replace sensors with type: PT1000
Replace OJ Air2 Fan IO21
Exchange polarization
Enable 0-10 V DC signal from controller
Check electrical connections
Replace OJ Air2 Fan IO21
Enable signal from controller
Check electrical connections
Check electrical connections
Replace OJ Air2 Fan IO21
Check electrical connections
Replace OJ Air2 Fan IO21
Check electrical connections
Replace OJ Air2 Fan IO21
Check that damper motor is of a type which can be
controlled by Direct Modbus and 24 V DC
Set correct address on damper motor. For information
on setting Modbus address, see documentation from
damper motor manufacturer.
Enable signal from controller
Check electrical connections
Check electrical connections
Replace OJ Air2 Fan IO21
Check that valve motor is of a type which can be con-
trolled by Direct Modbus and 24 V DC
Set correct address on valve motor. For information on
setting Modbus address, see documentation from valve
motor manufacturer.
Enable signal from controller
Check electrical connections
Check electrical connections
Replace OJ Air2 Fan IO21