Basler Electric DGC-2020HD - Manual (Page 298)

288 9469300990 Rev B
Input Resistance ....................................................... Nonlinear, approximately 4 k
Ω at 3.5 Vdc,
approximately 3 k
Ω 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 25°C
Clock Holdup
Battery Holdup Time ................................................. Approximately five years depending on conditions
Battery Type .............................................................. Rayovac BR2032, 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 DGC-2020HD. A battery is used to
maintain clock function during loss of power supply voltage. In mobile substation and generator
applications, the primary battery system that supplies the DGC-2020HD 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 approximately five years depending on conditions. After this
time, you should contact Basler Electric to order a new battery, Basler Electric P/N 38526.
Caution
Replacement of the backup battery for the real-time clock should be performed
only by qualified personnel.
Do not short-circuit the battery, reverse battery polarity, or attempt to recharge
the battery. Observe polarity markings next to the battery socket when
inserting a new battery. The battery polarity must be correct in order to provide
backup for the real-time clock.
Note
Failure to replace the battery with Basler Electric P/N 38526 may void the
warranty.
Battery Replacement Procedure
Battery access is located on the rear of the DGC-2020HD. See the Terminals and Connectors chapter for
battery location.
Step 1: Remove the DGC-2020HD from service.
Step 2: Locate the battery socket on the rear of the DGC-2020HD. Remove the old battery. Consult
your local ordinance for proper battery disposal.
Step 3: Insert the new battery so that the polarity markings on the battery match the polarity markings
next to the battery socket.
Step 4: Return the DGC-2020HD to service.
Timekeeping DGC-2020HD