LRWMANUAL 0321
KAM CONTROLS, INC.
41
CHECKING 5 VDC SUPPLY
Once the LRW input power has been verified as per instructions above, proceed to check the 5 VDC supply:
1.
Check LED2. If lit, power is flowing to the 5 V circuit.
2.
Proceed to verify the level of this 5 V supply by connecting the red wire of the multimeter to TP1 and black wire
to TP3 (GND) Terminal. FIG. 6-3.
3.
The DC voltage should read between 4.95 V and 5.05 V. This means the power supplies are operational, there
could be a fault in the other systems of the instrument. Contact KAM Technical Support for further assistance.
4.
If the voltage is not within limits, the 5 V power supply is nonfunctional. Return to the factory for repair.
5.
If LED2 does not light up, the 5 VDC supply may be damaged. Please contact KAM Technical Support at
+1 713 784 0000 or [email protected] for further assistance.
T R O U B L E S H O O T I N G C O N T I N U E D
1.
The LRW supplies power for the loop. Make sure the device that receives data from the LRW does not have a
power source of its own switched on. Also, the 4-20+ and 4-20- are isolated inputs from the chassis/earth.
Do not connect either to a common ground. Use an isolator if necessary.
2.
Check the voltage across the 4-20+ and 4-20- terminals on the Terminal Board. It should read between 10 V and
12 V. If not, contact KAM Controls for further assistance.
3.
If the voltage across the Loop terminals is within the specified limits, make sure the loop is working properly by
switching the multimeter to ammeter mode and checking the current running through it without a load.
The current must correspond with the readings on the LCD display:
If it does, the 4-20 mA wire from the LRW to the PLC may be damaged.
If it doesn't, contact KAM Technical Support for further assistance.
LOOP TROUBLESHOOTING
If you have not already done so, follow the steps on page 39 of this manual to remove LCD cover and faceplate.
If the Loop water reading does not match the water % reading on the LRW local display, please follow these
instructions:
