Simplex 2120 - Cdt Battery Adjustment Procedure

: 4. Leave the power applied at this power supply and proceed to the next CDT.
75. (New 2120 installations only) Once you have checked out all CDTs in the system and ait other 2120
equipment, perform the BMUX checkout procedures in the 2120 Multipiex System Cfxxko~t Procedures
manual (MUX2-21-004).
Note: When you finally power-up the BMUX, each CDT that comes up wili report a “LOCAL LOOP COMM
FAIL” error message. Ignore the message for the time being; it should clear once the CDT’s
NIAPNET’” II lines are installed.
ETlCDT BATTERY ADJUSTMENT PROCEDURE
CAUTBON: To be performed by Simplex personnel only.
NOTE: Protective cardboard cover over power supply must be removed to access components.
1. Locate R2, Pl, R15, R6, and R21 (Figure 7).
2. Remove batteries first, then AC power.
3. Disconnect connector Pl.
4. Reconnect AC power only.
5. Adjust R15 fully clockwise.
6. Connect VOM across the RED (+) and BLACK (0 volts) battery connections.
7. Adjust R6 until VOM reads about 26 volts.
8. Connect VOM across left side of R2 (+) and BLACK battery connector (0 volts).
3. SLOWLY adjust R15. At some point, the voltage reading on the VOM will SUDDENLY DROP from about 33
volts to around 10 volts. This is the TRIP POINT. Stop at this point.
-: c
! ,. Mow, SLOWLY adjust R6 clockwise until VOM reading trips back to about 33 volts. Stop at this point.
1-i. Ssnnect VOM as in Step 6 above. VOM should read about 28 volts.
i 2. Readjust R6 until VOM reads about 27 volts.
: 3. Connect VOM across TBl-1 (+) and TBl-2 (-)
?4. Adjust R21 until VOM reads 28 volts.
? 5. Remove AC power.
16. Reconnect connector Pl
17. Re-apply AC power.
i 8. Reconnect batteries.
19. Replace protective cardboard
cover over power supply.
R2
Pl
R15
R6
R21
FIGURE 7
8
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