Model MMU-1600G Series Op Man - Ver 1.07.23 - Rev 20151026DL
Page 12 of 58
2.4.7 Temperature Sensor
The monitor is capable of monitoring the temperature inside of the cabinet. The temperature sensor is capable of monitoring
temperatures in the range of -40
F to +214
F (-40
C to +101
C). The internal cabinet temperature is included in the data
logged into the Prior Faults Log when a fault occurs. If the actual temperature inside the cabinet is below -40
F (-40
C) at
the time the fault occurs, the temperature is logged as -40
F (-40
C). If the actual temperature inside the cabinet is above
+214
F (+101
C) at the time the fault occurs, the temperature is logged as +214
F (+101
C).
2.4.8 Real Time Clock
The monitor has a Real Time Clock (RTC) that is used as a reference for all date and time stamped events that are logged by
the monitor. The Real Time Clock is initialized to local Pacific Standard Time when the unit is undergoing final test. In
addition, the Daylight Saving Time user option is set to Off.
The Real Time Clock is preprogrammed to recognize Leap Years and Daylight Saving Time events through the year 2099.
Currently, per U.S. Federal standards, Daylight Saving Time is observed in the United States from 2:00 A.M. on the second
Sunday in March until 2:00 A.M. on the first Sunday in November.
The update priority of any time setting that affects the Real Time Clock is as follows:
1. Controller Time - The Real Time Clock is programmed with the time setting received from the Controller. This
information is received via the PORT 1 SDLC connector on the front of the monitor. If the Real Time Clock setting
differs from the Controller Time setting by more than two (2) seconds, The Real Time Clock will be synchronized to
the Controller clock. In the event that the Real Time Clock setting differs from the Controller Time setting by five (5)
or more seconds, the Real Time Clock will be synchronized to the Controller clock and an entry will be made to the
Time Change Log.
2. External Time Source (i.e. laptop computer) - The Real Time Clock setting can be modified through the use of the
RaeComM software. Connection to the laptop computer is made via the COMM PORT serial connector or optional
Ethernet connector on the front of the monitor. NOTE: Whenever the monitor is connected to an operational SDLC
bus, any time setting entered via the serial port will be overwritten by the Controller Time setting.
3. Front Panel - The Real Time Clock setting can be modified through the front panel. NOTE: Whenever the monitor is
connected to an operational SDLC bus, any time setting entered via the front panel will be overwritten by the
Controller Time setting.
If it is necessary to change the Real Time Clock setting in a monitor that is being used in a NEMA TS 2 Cabinet Assembly,
change the time setting on the cabinet controller. The time change will be broadcast to the monitor through the SDLC port.
2.4.9 Up Time Accumulator
The monitor has an Up Time Accumulator that keeps track of the total amount of time that the monitor has been powered up
since it was manufactured. It is saved in the format of Years, Months, Days, Hours, Minutes, and Seconds. The MMU-
1600G warranty coverage is valid for a total accumulated Monitor Up Time of two (2) years. Tracking and recording the
total time that the unit was in service provides an accurate means of validating any potential warranty claims.
2.4.10 Configuration Monitoring (Beeping Monitor)
The monitor checks all configuration settings for changes once each second. If a change is found, an audible buzzer will start
beeping to indicate that a configuration setting has changed except when the monitor is in one of the configuration screens.
This is to keep the buzzer from being too annoying when you know you are making changes. However, if you leave the
configuration menu the monitor will start beeping. If the change is undone, the beeping will stop. No fault monitoring
configuration changes are implemented until the front panel reset pushbutton is pressed and held for five (5) seconds or the
changes are saved using the Fault Configuration Menu. At that time five quick confirmation beeps will be heard, the new
settings will be implemented, and a Configuration Change log entry made.
The following configuration settings are monitored: Programming Card jumpers, Type Select input, Factory Options, Dual
Indication / Field Check, Per Channel Red Enables, Flashing Don’t Walk Monitoring, Flashing Yellow Arrow Left Turns,
Co-Channels, Thresholds, Logging Enables, Disable Local Flash, Modified CVM Latch, External Watchdog Enable, Type 16
Only, and Buzzer Disable.
On power up and any time the program card is changed the configuration stored on the program card is compared to the
configuration stored in the monitor. If they do not match the user is prompted to choose which data set to use. If the
program card is selected, the configuration settings on the card will be copied into the monitor. If the monitor is selected, the
configuration settings on the program card are overwritten with the current monitor configuration. All user information
(Ethernet settings, Location, Location ID, and Agency ID) as well as fault monitoring settings are copied. See Section
4.10
for front panel display during selection of configuration source.