APC MX28B-1200 User Manual

MX28B-1200   PRODUCT MANUAL 

Revision B 

28 MX28B-1200/2400 

The optional temperature probe is used to monitor the battery string temperature.  To get the 
most representative temperature measurement, the probe should be placed in contact with a 
battery cell that is centrally located.  The probe should be placed directly in contact with the cell 
(not the frame surrounding the cell).  Generally, the cell cover can be used; be careful not to 
allow the probe body to touch the terminals. 

1)  Plug the connector end of the temperature probe into J5 the control unit interface card in 

the base power bay. 

2)  Route the cable as required to position the probe on the selected battery cell 

3)  Remove the adhesive protection strip from the probe body and press the adhesive side of 

the probe on the battery cell cover. 

 

15 ft. (4.6m) 

FFA-0013-1 

50 ft. (15.2m) 

FFA-0013-2 

 

Before initiating power-up and checkout, ensure that the following conditions exist: 

1)  Make sure that the external circuit breaker protecting the cables from the battery to the 

power plant is turned OFF (the battery cables should be connected to the power plant, but 
the battery should not be connected). 

2)  Make sure that all load circuit breakers are turned OFF and all load distribution fuses are 

removed. 

3)  Verify that all rectifiers have been installed. 

Turn on the circuit breakers that supply ac power to the rectifiers in the MX28B dc power plant.  
The main screen should appear on the control unit display (see Figure 5-11).  The display on the 
control unit is a 2-lines 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 5-11 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).