7
• 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 b y A C.
The battery rating (ampere-hour capacity) is dictated by the length of time power outages
may last. A Model 610A Controller requires approximately 2 ampere (peak ) at 24 VDC.
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 manuf act urer’s
recommended level. The cable length from battery to controller s hould 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
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