MP SERIES™ Battery Backup System for Traffic Signals: MP2000E System
Volume One: Operating Manual
Page 7-6
7.b.3.2 Battery Charging Check
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If the MP2000E is in line mode with no faults present the batteries should be getting
charged. In order to measure the charging current ensure the load is powered by the
utility line so there is no load current going through the MP2000E. To check the charger
operation measure the AC input current into the MP2000E. If the battery voltage at the
battery test point is less than 48VDC then the charger should be in full operation. This
should be seen by an AC line current of approximately 4 amps. If a battery voltage is
greater than 48VDC then the charger may be in float voltage operation. During float
voltage operation a fluctuating current will be seen in the AC line that will be a low as
zero and as high as 4 amps.
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If the AC line current is less than 1 amp then the battery is not charging. This can be
caused by a faulty sensor. Shut the MP2000E off and remove the battery temperature
sensor. Check the probe tip to ensure it is not crushed, inspect the wire for damage,
and inspect the connector for corrosion. The resistance of the probe should be
approximately 10,000 ohms at 25°C, 20,000 at 10°C, and 5000 at 40°C.
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If the sensor is OK check the temperature of the battery in the meter menu. If the
temperature of the battery is above 50°C then the unit will not charge.
7.b.3.3 Battery Backup Check
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The Battery backup is tested by actuating a self-test by shorting the front panel control
contacts 19 and 20 labeled self-test, through the keypad self-test, which is described in
Section 6.b.9 or the RS232 menu under maintenance mode battery test as described in
Section 6.c.4. Once the MP2000E is placed in self-test the MP2000E should transfer to
battery backup mode.
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If the MP2000E exhibits a short circuit fault when transferring to battery backup mode
check the wiring to the load and ensure that the load is not too large for the unit.
Remove the load and retry the test if a short circuit appears with no load connected
then the MP2000E is defective.
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If the MP2000E exhibits a Battery low voltage fault check the battery health and the
wiring connection from the MP2000E to the battery.
7.b.4
Self -Test
The Self-Test confirms that the unit can transfer into and out of Battery Mode while supporting
the output load at the same time.