Specifications

Section 1. Installation and Maintenance
1-8
1.3.3.2 PS100 Lead Acid Power Supply
The PS100 power supply includes a 12 V, 7.0 amp-hour lead acid battery, an
AC transformer (18 V), and a temperature compensated charging circuit with a
charge indicating diode. An AC transformer or solar panel should be
connected to the PS100 at all times. The charging source powers the CR3000
while float charging the lead acid batteries. The internal lead acid battery
powers the datalogger if the charging source is interrupted. The PS100
specifications are given in Table 1.3-3.
The two leads from the charging source can be inserted into either of the CHG
ports, polarity doesn't matter. A transzorb provides transient protection to the
charging circuit. A sustained input voltage in excess of 40 V will cause the
transzorb to limit voltage.
The red light (LED) on the PS100 is on when a charging source is connected to
the PS100 CHG ports. The switch turns power on and off to the 12 V ports,
battery charging still occurs when the switch is off.
Switch the power to "off" before disconnecting or
connecting the power leads to the Wiring Panel. The
Wiring Panel and PS100 are at power ground. If 12 V is
shorted to either of these, excessive current will be drawn
until the thermal fuse opens.
Monitor the power supply voltage using the datalogger Battery instruction.
Incorporate this instruction into your data acquisition programs to keep track
of the state of the power supply. If the system voltage level consistently
decreases through time, some element(s) of the charging system has failed.
The Battery instruction measures the voltage at the Power In terminals, not the
voltage of the lead acid battery. External power sources must be disconnected
from the CR3000 and charging circuit in order to measure the actual lead acid
battery voltage.
CAUTION