Model 580A
7
•
AWG 14 wire should be used to prevent excessive voltage drop.
•
Wiring runs should be as short as possible.
•
Connect the positive supply to
24VDC (+)
and the negative supply to
24VDC (-)
on the terminal block. An internal diode protects the system in case of
inadvertent supply reversal.
2.3 Battery Backup
An emergency battery backup may be employed on a system normally powered by AC. A
Model 580A Controller requires approximately 2 ampere (peak) at 24 VDC. The battery
rating (ampere-hour capacity) is dictated by the length of time power outages may last.
General Monitors recommends that a Lead-Acid type battery be used. This type of
battery can be expected to last for several years with minimum maintenance.
The customer-furnished battery may be connected as shown below. Manual or relay
switching is not required. There is no provision for battery charging. A customer furnished
battery charger must be used to keep the battery charged to the battery manufacturer’s
recommended level. The cable length from battery to controller should be as short as
possible. Should an AC power failure occur, the 24-Volt battery supplies current through
the diode to the controller circuitry.
DO NOT USE MORE THAN A 24-VOLT BATTERY
.
Figure 2: Schematic Battery Backup System
