
MAINTENANCE NOTICE
IT-TDFX-245 revision 1 Page 20/30 April 2010
5.9 1ST level maintenance
5.9.1 Power LED extinguished
Check that the supplyfrom the module is wiredcorrectly.
Check that the voltage between V+ and V- (two stage terminal) is equal to 24 V DC +/- 5% or 24 V AC
–48 V AC/DC +/- 10% depending on the unit used.
If the result of these actions is negative, replace the unit.
5.9.2 Fault LED illuminated or flashing
Red LED flashing = Overload or short-circuit on sensor or solenoid valve.
Disconnect the sensor/solenoid valve connector and check that the fault has disappeared. Check the
sensors andsolenoid valve one by one.
Red LED illuminated = Supply voltage too low or overload or short-circuit on a peripheral of the unit
(faulty solenoid valve, ….).
Check that the voltage between V+ and V- (two stage terminal) is equal to 24 V DC +/- 5% or 24 V AC –
48 V AC/DC +/- 10% depending on the unit used.
Disconnect the sensor/solenoid valve connector and check that the fault has disappeared. Check the
sensors andsolenoid valve one by one.
5.9.3 Testing the solenoid valve
The green LED on the unit mustbe illuminated.
Control the solenoid valve coil using the PLC.
Measure the voltage on the peripheral connector using a voltmeter between terminals O1 and CO.
Check that this voltage corresponds to the solenoid valve control voltage. If the result of this stage is
negative, check the wiring between the unit and the PLC.
If the “Main actuator” LED is illuminated, measure the voltage on the peripheral connector between
terminals SV1 and SV-. This voltage must be between 20 and 24 V DC.
If this voltage is correct, change the solenoid valve.
Otherwise, disconnect the peripheral connector. If the “Main actuator” LED is extinguished, change the
unit.
5.9.4 Testing the sensors
The unit must be connected electrically to the PLC.
Use a voltmeter to check that the voltage between terminals V+ and V- on the sensor side of the
terminal is between 20 and 24 V DC.
Place a metallic object in front of sensor target to check that the LED on the sensor illuminates correctly.
The LED does not illuminate: Change the sensor and restart the tests from step 1.
LED illuminates = Measure the voltage using a voltmeter between terminals V- and I1 or I2 on the
peripheral terminal of the unit and check that the voltage is 12 V DC.
Check that the LED on the unit corresponding to the sensor is illuminated correctly.
LED extinguished -> Change the module.
LED illuminated = Check the voltage on the two stage connector between the terminals I1 and CI or I2
and CI depending on the sensor tested.
If the voltage is correct, check the wiring between the module and the PLC, otherwise change the unit.