MP SERIES™ Battery Backup System for Traffic Signals: MP2000E System
Volume One: Operating Manual
Page 2-7
o
Ext. Fan Alarm
o
Door Interlock
2.c.5 Temperature Sensor and Fans
Figure 2-9: MP2000E Temperature Sensor and Fans
Description of Features Highlighted in Figure 2-9
I
NTERNAL
F
AN
: This
microprocessor-controlled fan
regulates the unit’s internal
temperature. It must not be
blocked. The filter in front of the
fan is removable for cleaning.
Note: The filter should be
inspected at least every six
months. Clean by removing it,
running water through the filter,
and air-drying before reinstalling.
E
XT
F
AN
48VDC
P
ORT
: Provides DC power
(48VDC, 3 Amp Max) that can be used to
power an optional fan mounted inside the
enclosure.
B
ATTERY
T
EMP
S
ENSOR
:
This port is used to
attach the battery temperature probe to the
unit. The charging voltage is temperature
dependent, and the microprocessor of the
smart charger adjusts the voltage for
optimal charging. The temperature probe
connector must be plugged in for normal
operation. The sensor end contains a ring
lug and should be secured to the battery
terminal.
Note: If the BBS is not charging the batteries check the temperature probe.
To test the temperature probe, unplug it from the face of the BBS. Check the
resistance of the temperature probe by inserting the probes of an ohmmeter
into the top and bottom pins of the connector. The meter should read
approximately 12,000
Ω
at 25°C (77°F). If resistance is not in this range,
replace the temperature probe.
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