9424200996 51-3
BE1-11m Timekeeping
operating power is restored after an outage and the clock is re-synchronized the current year is restored.
When the clock rolls over to a new year, the year is automatically incremented in nonvolatile memory. An
alarm bit is included in the programmable alarm function for loss of IRIG signal. The alarm point monitors
for IRIG signal loss once a valid signal is detected at the IRIG port.
Connections
IRIG connections are located on a terminal block shared with the RS-485 and input power terminals.
Terminal designations and functions are shown in Table 51-1.
Table 51-1. IRIG Terminal Assignments
Specifications
Interface supports IRIG Standard 200-04, Format B006.
Input Signal ............................................................... Demodulated dc. Level-shifted, digital signal
Input Voltage Range ................................................. ±10 Vdc maximum
Input Resistance ....................................................... Nonlinear, approximately 4 kΩ at 3.5 Vdc,
approximately 3 kΩ at 20 Vdc
Logic Voltage Threshold
High ........................................................................... 3.5 Vdc minimum
Low ............................................................................ 0.5 Vdc maximum
Real-Time Clock Specifications
Resolution ................................................................. 1 s
Accuracy.................................................................... ±1.73 s/d at 77°F (25°C)
Clock Holdup
Capacitor Holdup Time ............................................. Up to 24 hours depending on conditions
Battery Holdup Time ................................................. Greater than 5 years depending on conditions
Battery Type .............................................................. BR2032 or CR2032, coin-type, 3 Vdc, 195 mAh
Basler Electric P/N 38526
Backup Battery for the Real-Time Clock
The backup battery for the real time clock is a standard feature of the BE1-11m. A battery is used to
maintain clock function during loss of power supply voltage. In mobile substation and line-powered
applications, the voltage that supplies the BE1-11m power supply may be disconnected for extended
periods (weeks, months) between uses. Without battery backup for the real time clock, clock functions will
cease if battery input power is removed.
The backup battery has a life expectancy of greater than five years depending on conditions. After this
time, you should contact Basler Electric to order a new battery, Basler Electric P/N 38526.
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