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The MX28B dc power plant, however, permits the user to program the system alarms in various ways. A Printed Circuit (PC) board designated “EAA-0075” is mounted in the space above the master control unit and provides terminal block connection points for alarm outputs and alarm inputs (Figure 5-8). These cage-clamp terminal blocks are operated by pushing back the lever, inserting the wire and then releasing the lever to clinch the connection. Recommended wire size is #28 AWG to #20 AWG. Alarm Outputs Alarm Inputs Figure 5-8 Alarm Interface PC Board MX28B-1200/2400 MX28B-1200 PRODUCT MANUAL Revision B 5.7.1 External Alarm Inputs Four external alarm inputs with assignable priority levels are available. These alarm inputs respond to external dry contact closures between normally open (NO) and common (C) or contact openings between normally closed (NC) and C (see Table 5-1). Connect To Input Alarm Terminals OPEN NO-C CLOSED NC-C Table 5-1. External Alarm Input Definition Table 5-2 shows the external alarm input connection designations. Connector J4 is located on the alarm interface board mounted in the space above the control unit. Systems are shipped with jumper wires connecting each NC and corresponding C contact. A jumper wire should be removed only if the corresponding NC-C contacts are going to be used. USER ALARM NOTES #1 #2 #3 #4 NO1-NC1-C1 NO2-NC2-C2 NO3-NC3-C3 NO4-NC4-C4 ___________________________ ___________________________ ___________________________ ___________________________ Table 5-2. External Alarm Input Connections 5.7.2 Alarm Outputs There are eight alarms available that provide outputs via Form “C” relay contacts. The last two of these are pre-assigned as the Minor and Major alarm outputs. The Major relay is energized (NO-C contacts closed) during normal (non-alarm) operating conditions; all the other relays energize when an alarm condition occurs. The other six outputs are initially designated as “Relay 1” through “Relay 6” (the user may assign more meaningful names if desired). The various system alarm conditions can be assigned to any of the eight alarm outputs. Table 5-3 shows the alarm output connection designations. Connectors J1 and J2 are located on the alarm interface board mounted in the space above the control unit. The relay contacts should only be used to switch resistive loads of 0.5 amperes or less at 60 volts or less. MX28B-1200/2400 Revision B MX28B-1200 PRODUCT MANUAL USER ALARM NOTES RELAY #1 RELAY #2 RELAY #3 RELAY #4 RELAY #5 RELAY #6 MINOR MAJOR J1 NO1-NC1-C1 NO2-NC2-C2 NO3-NC3-C3 NO4-NC4-C4 J2 NO5-NC5-C5 NO6-NC6-C6 NO7-NC7-C7 NO8-NC8-C8 ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________ Table 5-3. Alarm Output Connections 5.8 Connecting The Loads 5.8.1 DC Circuit Breakers and Fuses Both plug-in circuit breakers and Telecom fuses can be installed in the MX28B power plant for dc distribution circuit protection. Available plug-in circuit breakers are shown in Table 5-4. Plug-in circuit breakers rated at 60A or more require two mounting positions and require a breaker adapter kit, which is included (see kit selection information below the table). The breaker adapter kit includes all necessary mounting hardware. BREAKER RATING PART NUMBER BREAKER RATING PART NUMBER 1 A FFA-0014 40 A FFA-0020 3 A FFA-0015 50 A FFA-0025 5 A FFA-0016 60 A FFA-0021-X * 10 A FFA-0017 70 A FFA-0022-X * 15 A FFA-0028 80 A FFA-0023-X * 20 A FFA-0018 100 A FFA-0024-X * 30 A FFA-0019 * -1: adapter has #10 studs on 5/8” centers for two-hole cable lug -2: adapter has #10 studs on .” centers for two-hole cable lug -3: adapter has .” studs on 1” centers for two-hole cable lug Table 5-4. Plug-in Circuit Breakers MX28B-1200/2400 MX28B-1200 PRODUCT MANUAL Revision B Fuse holders that accommodate telecom fuses are located in a separate fuse power distribution box frame. The fuse holders are designed to hold Bussmann® (or equivalent) TPL-series fuses in sizes of 70 amps to 600 amps. The following stock sizes are available from APC: FUSE APC PART RATING NUMBER 200 A FFA-0106 300 A FFA-0093 600 A FFA-0099 Table 5-5 Telecom Power Fuses 5.8.2 Installation of Circuit Breakers and Fuses 5.8.2.1 Plug-in Circuit Breakers 1) Remove the circuit breaker cover panel and the plastic cover(s) from the desired location(s). 2) Install the circuit breaker(s) by snapping the top terminal onto the upper bus bar and rotating the unit down until the second terminal snaps onto the breaker termination post as shown in Figure 5-9. The breaker alarm terminals are designed to make contact with the alarm terminal board as the breaker is snapped into place. NOTE: Circuit breaker alarm contacts close when the circuit breaker is tripped but not when it is turned OFF. ***** CAUTION ***** During circuit breaker installation, carefully align the breaker alarm terminals with the alarm terminal boar...

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