34
OODMANUAL 0720
KAM CONTROLS, INC.
3.
Use a mutimeter in voltmeter mode to verify the voltage of the Processor Board’s primary power supply by
measuring across TP1 and TP5 (GND). The voltage should be b4.8 VDC and 5.1 VDC.
If the voltage is lower than 4.8 VDC, it indicates that the primary power supply of the processor board is not
working properly or there is a short circuit on the board. The Processor Board needs to be fixed or replaced.
Contact KAM Technical Support for further assistance.
NOTE: LED 1 on the Processor Board remains lit when there is voltage between TP1 and TP5. If not, it indicates
a faulty LED. The faulty LED will not affect the operation of the instrument, but a Processor Board repair is
recommended.
4.
Use a multimeter in voltmeter mode to verify the voltage of the Processor Board’s secondary power supply by
measuring across TP2 and TP5 (GND). It should be b3.1 VDC and 3.4 VDC.
If you have a voltage lower than 3.1 VDC, it indicates that the secondary power supply is not working properly or
there is a short circuit on the board. The Processor Board needs to be fixed or replaced. Contact KAM Technical
Support for further assistance.
NOTE: LED 2 on the Processor Board remains lit when there is voltage between TP2 and TP5 (GND). If not, it
indicates a faulty LED. The faulty LED will not affect the operation of the instrument, but a Processor Board repair
is recommended.
T R O U B L E S H O O T I N G C O N T I N U E D
4-20 mA OUTPUT LOOP
Once the power supplies have been verified, proceed to verify the output loop by following the procedure below.
1.
Use a small screwdriver to disconnect the wires connected to the 4-20 mA terminals from the Terminal Board.
2.
Using a multimeter in voltmeter mode, measure the voltage across the two wires that were connected to the
4-20 mA+ and 4-20 mA- terminals by placing one of the voltmeter's test lead in one wire and the other test
lead on the other wire. Polarity is not important. The voltage should be 0 VDC. If there is any voltage, the loop is
powered up externally. Proceed to disable the power source from the connected device.
3.
Use a small screwdriver to fully close the 4-20 mA+ and 4-20 mA- terminals. Using a multimeter in voltmeter
mode, measure the voltage across the 4-20 mA+ and 4-20 mA- terminals. The voltage should be between
10.0 VDC to 12.0 VDC. If the voltage is within the specified range, continue to step 4. If not, contact KAM
Technical Support for further assistance.
4.
Using a multimeter in ammeter mode measure the amperage across the 4-20 mA+ and 4-20 mA- terminals.
The electric current should be between 3.9 to 20.1 mA. If the voltage from step 3 is within the set limits but
the electric current is not, check the multimeter fuse and repeat this step. If there is no change, contact KAM
Technical Support for further assistance.
If the measurements are within the corresponding ranges, reconnect the 4-20 mA output loop wires to the OOD
as per the wiring diagram on FIG. 3-18, page 15. If the PLC cannot read the output, there could be a wiring
issue with the loop. Please inspect the wires from the OOD to the PLC. If the issue persists, continue to the next
section, and contact KAM Technical Support for further assistance.
NOTE: The 4-20 mA terminals are isolated from the chassis/earth ground.
