MP SERIES™ Battery Backup System for Traffic Signals: MP2000E System
Volume One: Operating Manual
Page 7-1
Section 7
Maintenance
7.a Preventive Maintenance
7.a.1 Battery Backup Time Test
This Battery Backup Time Test measures back-up time during power outage by actually
discharging the batteries. The back-up time is load as well as battery dependent, thus more
back-up time is available with a lower load (in Amps or Watts) and less time with more load. It
is recommended that this test be performed every six months.
Figure 7-1: Battery Backup Time Test Procedure
Disconnect the incoming
Utility Power
TURN ON the incoming Utility
Power for recharging the batteries
Record the time when the unit
shuts off. (Both LEDs are off and
the LCD display indicates
STANDBY)
LOW BATT is displayed
The time between the two is the
LOW BATTERY CAPACITY back-
up time
Front Panel LCD indicates ON
BATT. Battery supplies the Power
to the load. Record the start time
EXAMPLE:
Start time is 1PM.
ON BAT contact if selected, is activated.
Low Battery Alarm LED appears at 4PM.
LOW BAT contact at selected value will
be activated.
Low Battery capacity battery back-up time
will be the time difference between 4PM
and 1PM or 3 hours.
Shutdown time is 5PM.
Battery reserve time will be the time
difference between 4PM and 5PM or 1 hour.
The Total Battery Back-up time is the sum
of Low Battery capacity back-up time and
Battery Reserve time or the time difference
between 5PM and 1PM or 4 hours.
START
RUN TIME TEST
COMPLETED
PROCEDURE