Adding a DC UPS to a PLC system is a wise investment in redundancy allowing 24vdc control systems to continue to function for hours without power. This becomes doubly important when a PLC with alarms and network connectivity is in use. Having the PLC stay online to allow a technician to connect to the unit remotely to diagnose a power failure or head off a much larger problem before it occurs.
With the range of power supplies and UPS modules available a designer can incorporate redundant power supplies and UPS modules easily into a panel.Redundancy modules can couple and decouple units wired in parallel as required to maintain output voltages. A UPS in parallel can “top-up” a power supply with an under-voltage output averting damage to sensitive electronic equipment.
DC-UPS units take up less space and generate much less heat than an AC UPS making them ideal for control panel environments. Their small form factor and DIN rail mounting allow a UPS to be included along side a power supply in any medium to large control panel.
Modern DC-UPS’s have smart features making them exceedingly reliable:
Using 24VDC control is convenient for use with common solenoids, keeping a panel low voltage, and the redundant options available using a DC-UPS. Its an option worth considering in your next control panel design.