Apc DC Power Plant MX28B-1200 User Manual download pdf (Page 38)

MX28B-1200 PRODUCT MANUAL Revision B

32 MX28B-1200/2400

permits modification of some parameters; no security is required for viewing status items. The

security level password is entered through the “PIN” screen. If no front panel keys are pressed

for 60 minutes, the active password reverts to “0000” and “█APC█” begins to move about the

display. Pressing any key returns the display to normal; the password must be re-entered if

system parameters require changes. The default passwords for level 1 and level 2 are “1111”

and “2222”, respectively. There are no alternate passwords or “backdoors” for accessing the

system. A forgotten password may require a new master controller board, at customer expense.

System control parameters are stored in non-volatile memory and will not be erased when power

is removed for the master control unit. However, if a new program EPROM is installed or a

different device model selected, the system control parameters will be re-initialized to the

factory default settings.

Eleven LEDs are provided on the front panel of the control unit to indicate system status. Three

LEDs grouped together vertically provide overall system status; they are “MAJOR”, “MINOR”,

and “NORMAL”, indicating the presence of a major alarm, a minor alarm, or normal operation.

The other eight LEDs correspond to the active state of each of the alarm output relays and are

labeled “ALM1”∙∙∙“ALM6”, “MIN”, and “MAJ”.

6.2 External Alarm Inputs

The four external alarm inputs (also referred to as “Input Relay Alarms”) can be assigned a

priority and routed or “mapped” to alarm output relays. Available assignments are “Ignore”,

“Major”, “Minor”, and “Relay 1” ∙∙∙ “Relay 6”. Screens for making the assignments are

located at [SYSTEM/IN-RLY/RLY-MAP]. This special menu notation is explained with an

example in section 6.4

A user defined name or “alias” may also be assigned to each of these input alarms. Screens for

making these assignments are located at [SYSTEM/IN-RLY/ALIAS]. For information on

wiring connections to these inputs refer to Section 5.7.1.

6.3 Alarm Output Relays

There are eight alarm output relays designated Relay 1 through Relay 6, Minor, and Major,

respectively. Various system parameters may be programmed to activate any of these alarm

relays when set thresholds are exceeded or specific conditions occur. The first six relays can

also be assigned a priority and routed or “mapped” to other output alarm relays. Available

assignments are “Ignore”, “Major”, “Minor”, and “Relay 1” ∙∙∙ “Relay 6”. Screens for making

these assignments are located at [SYSTEM/OUT-RLY/RLY-MAP]. This feature makes it

possible for a single alarm condition to activate multiple alarm output relays including the Minor

or Major alarm relay. A user defined name or “alias” may also be assigned to each of the eight

output relay alarms. Screens for making these assignments are located at [SYSTEM/OUT-

RLY/ALIAS]. For information on making wiring connections to the alarm output relays refer

to Section 5.7.2.

6.4 Parameter Locations, Descriptions, and Default Values

The location, description, and factory programmed default value for each of the MX28B system

parameters is found in Table 6-1. The table also shows all of the status and information screens

with typical displays. The location of a parameter screen is shown in brackets, for example:

[SYSTEM/IN-RLY/RLY-MAP]. To find the parameters that can be accessed in this category,

starting from the main menu screen, do the following:

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 53 54

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Apc DC Power Plant MX28B-1200 User Manual Page 38

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