Troubleshooting Chore-Tronics® 2 Control
100
MT1843B
IONet Error Addr:xx
This is a communication failure between the Main box and 1 or more of the Manual
Switch Boards (iMSCM). The number following the address indicates which board
is having the communications issues. These trouble shooting steps assume that the I/
O Net alarm occurred on a previously functioning control and no boards have been
replaced. Do the following steps:
1. Clear the alarm. See if it reappears in approx. 30 seconds. Check to make sure
the same board address appears. If the same address appears go to Step 2. If the
I/O Net alarm does not appear at all or the alarm does occur, but at a different
address go to Step 3.
2. Open the door to the Relay Box and remove the protective cover plate. Caution:
Line voltage will be present! Check the light in the center of the switch board
where the I/O Net alarm occurred to see if it is flashing (normal operation). If
the light is flashing go back to Step 1. If the light is not flashing go to Step 4.
3. Power off the Control. Check the polarity of the twisted pair that is connected to
the I/O Net terminals in both the main box and the relay box Caution: Line
voltage will be present! Also, check the polarity of the 24 Vdc Twisted Pair in
both the Main Box and the Relay Box. Correct if necessary. If the I/O Net alarm
is still occurring go to Step 4.
4. Check to make sure that the #1 DIP switch on the IO Board of the Main Box is
set to the ON position for 32 and 40 output Controls or to the OFF position for
56 outputs Controls. For all Controls, check that the jumper in the upper right
hand corner of the Switch Board closest to the bottom is set to the ON position.
Correct if necessary. If the I/O Net alarm is still occurring go to Step 5.
5. Check the routing of the Twisted Pair wire for both the I/O Net and the 24 Vdc.
Make sure that Twisted Pair wire is used, the wires are run separately from line
voltage wires, and that when the pair does cross line voltage wires it is at a 90
degree angle. Correct if necessary. If the I/O Net alarm is still occurring go to
Step 5.
6. Check the grounding of the Control. There should be one ground wire con-
nected from Earth ground to the Ground Rail of the Main Box of the Control.
There then should be a ground wire connecting the ground rail of the Main Box
to the Ground Rail of the Relay Box. Correct if necessary. If the I/O Net alarm is
still occurring go to Step 6.
7. Remove power from the Control. Open the Relay Box and remove the protec-
tive cover plate. Check all the terminals of all boards that have had an I/O Net
alarm occur. Make sure that all wires from the wiring harness are securely in the
correct terminal position and that the screws are tight. Correct if necessary. If I/
O Net alarm is still occurring go to Step 8.
8. Replace the Switch Board.
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