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Rev 1 MX28B-1200+27V PRODUCT MANUAL
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5.10.1 Apply AC Power
Turn on the circuit breakers that supply AC power to the rectifier shelves in the MX28B DC power
plant. Turn on the individual 20 Amp circuit breakers for each rectifier on the shelf. The main screen
should appear on the control unit display (see Figure 5-10). The display on the control unit is a 2-line
by 16-characters display. The cursor cycles below the characters of the active selection on the
display. Information shown in the second line of Figure 5-10 that extends beyond 16 characters (to
the right of the “S” in “ALARMS”) can viewed on the control unit display by using the scrolling
controls (refer to Section 6 for operation of the control unit).
NOTE: When AC power is initially applied, there is a 60-second period during which no alarms
are reported.
MX28B1200 24V +
STATUS ALARMS SYSTEM MODULES BATT PIN OEM
Figure 5-11 Control Unit Display
5.10.2 System Parameters Verification/Adjustment
The MX28B system control unit is delivered with pre-programmed parameter default settings. A
complete listing and description of all system configuration parameters as well as displayable system
status and information is provided in Section 6. Read Section 6 to gain an understanding of and how
to use the operational features provided by the MX28B DC power plant. As a minimum, the
following parameters should be verified and adjusted, if required, before connecting batteries or loads
to the power plant:
1) Battery Float Voltage - default = +27.00V DC (Check the manufacturer’s recommendation
for the batteries being used in the system.)
2) Battery Maximum Recharge Rate - default = 200A. (Bellcore specifications recommend a
maximum charging rate of battery capacity (in Ampere-hours) divided by 20 hours; check the
manufacturer’s recommendation.)
3) System Voltage - measurement ≅ +27.00V DC (This is a measurement by the system of the
DC output bus voltage.)
4) LVD Option - default = “Enable” (If the MX28B does not have an LVD installed, this should
be changed to “Disable”.)
5) Rectifier Information - Check the rectifier information displays to verify that all rectifiers
installed can be viewed on the control unit display and that no rectifier alarms are active.
Section 6 provides location information for these parameters and how to make changes if required.