CDT FINAL CHECKOUT
CAUTION: Notify building personnel and appropriate authorities (i.e.,
fire and police departments. etc.) before
proceeding.
A. Identification of Contractor Wiring Errors
1. Before the contractor applies power to any CDTs, verify that the MAPNET’” II communication lines are
properly terminated on each CDT using Figure A or B as appropriate from the M-2120-CDT Wiring
Diagrams.
2. The contractor should now appiy power to each system component by:
o Applying AC power first.
l
Connecting batteries last.
3. Allow two minutes for the BMUX to initialize.
Note 1: You will need each CDT’s set of MONITOR and CONTROL MODULE SPECIFICATION SHEETS
to locate devices reported in Step 4.
Note 2: Each CDT uses two transponder addresses, so addressable devices are reported on either of the
CDT’s addresses.
4. Identify all CDT monitor and control device troubles using the local (or remote) printer output, or by using
the front panel display and appropriate pushbuttons.
Remember: The BMUX reports CDT device troubles per addressable device, so the CDT trouble reports
you will get will refer directly to a specific MAPNET’” II device. Use the first three digits of the device’s point
number to determine the location of the associated CDT panel.
Note: If you get either a “LOCALiOOP COMM FAIL” or “LOCAL LOOP MCCULLOH” trouble report from
a CDT, then the MAPNET’” II lines associated with the reporting CDT are completely disconnected
from the CDT panel.
5. Group troubled devices by reporting CDT. If there is a string of devices on the same MAPNET’” II that have
troubles, look for:
o Open wiring a? a branch circuit junction box.
l
Open wiring in the branch circuit itself.
l
Reversed MAPNET’” II wire pairs at a branch circuit junction box.
6. Locate other troubled devices and:
l
Check device wiring.
o Check device addressing using the appropriate CDT MONITOR or CONTROL MODULE
SPECIFICATION SHEETS.
If the wiring and address check out properly, replace the troubled device.
B. CDT Functional Checkout
CDT functional checkout occurs at the same time as the 2120 system functional checkout. Refer to the information
on system functional checkout in the 2120 Multiplex System Checkout Procedures manual (MUX2-21-004).
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