Campbell Scientific PS12LA, PS512M, CH12R, CH512R Power Supplies/Regulators - Manual (Page 6)

PS12LA, PS512M, CH12R, CH512R Power Supplies and Charging Regulators
2
3. Wiring
An internal or external battery is connected to the charger by means of the INT
(Internal) or EXT (External) connectors, as shown in Figure 1. An “external
battery” cable comes with the charger that allows connecting another battery to
the charger to provide power if the main battery is removed. The red lead
connects to the positive battery terminal and the black lead connects to the
negative terminal.
Reversal of polarity of external battery will damage the
PS12LA or PS512M.
It is possible to leave two batteries connected. The battery connections are
diode isolated (Figure 3-2); however, if one of the batteries fail, it could draw
all the charging current and the other battery will be discharged.
A battery must be attached for the charger to function
correctly as a power supply.
The leads from the transformer or solar panel are connected to the CHG
terminals. Polarity does not matter; either lead can be connected to either
terminal.
The wires that connect power to the datalogger and/or peripherals are
connected to the +12 and ground ( ) terminals.
INT
EXT
BATT
CHG
OFF ON
CHG
CHG
+12
+12
FIGURE 1. Wiring to Charger
WARNING
CAUTION
To Battery
From Transformer or Solar Panel
{
To Datalogger or peripherals
{
These look identical
when unplugged