IC693PWR321 Standard Power Supply – Built for Flexibility and Dependability

One Power Supply, Three Outputs, and a Wide Input Range

The IC693PWR321 is the standard power supply you’ll find in most Series 90-30 baseplates, and it’s earned that spot for good reason. It accepts a broad input range—85 to 264 VAC or 100 to 300 VDC—which means it can run on everything from 120V utility power to 240V industrial circuits, and even DC backup systems without any reconfiguration. That kind of flexibility simplifies panel design and reduces the number of spare parts you need to stock. What really makes this unit useful, though, is its three separate outputs. There’s a +5 VDC output to run the backplane and logic, a +24 VDC relay output specifically for Series 90-30 output relay modules, and an isolated +24 VDC output. That isolated output pulls double duty: it supplies internal power for certain modules and can also be used externally to power 24 VDC input modules. Having relay power and isolated power on separate rails keeps field wiring clean and avoids noise coupling back into sensitive circuits.

Understanding the 30-Watt Total and What It Means in Practice

The load capacities are clearly spelled out, but it’s important to look at them as a system rather than as independent numbers. The +5 VDC output can supply up to 15 watts, the +24 VDC relay output is also rated at 15 watts, and the isolated +24 VDC output can go as high as 20 watts. But the spec sheet also makes one thing clear: the total combined load across all three outputs cannot exceed 30 watts. In practice, that means if you’re pulling close to the full 20 watts on the isolated output, you need to keep the other two outputs lightly loaded. That’s not a limitation—it’s just a reminder that this is a 30watt power supply, not three independent supplies in one. If you work within that budget, the output voltages stay rock solid. The +5 VDC line holds between 5.0 and 5.2 volts, which is exactly what the backplane expects, and the two 24 VDC outputs typically land somewhere between 21.5 and 28 volts depending on load. For most systems, that’s more than adequate to keep relay coils and input sensors happy.

Protective Features That Save You from Unplanned Downtime

One thing I appreciate about this power supply is that it includes protection features you don’t always find in basic units. The +5 VDC output has overvoltage protection that trips between 6.4 and 7 volts, so if the regulation ever fails, it’ll shut down before damaging the CPU or backplane. There’s also overcurrent protection on that same output, clamped at 4 amps maximum. Those limits are set conservatively enough to prevent nuisance trips but low enough to protect downstream components. Another spec worth noting is the holdup time. At 20 milliseconds minimum, the power supply can ride through short power sags or momentary interruptions without dropping the outputs. In older plants where power quality can be inconsistent, that 20 ms can mean the difference between a system that stays running and a system that resets in the middle of a process. Add in the 4A peak inrush current rating, and you’ve got a unit that’s designed to handle real-world industrial power conditions without being overly sensitive.

FAQ

Q1: What is the input voltage range for the IC693PWR321 power supply?
A1: It accepts 85 to 264 VAC or 100 to 300 VDC input.

Q2: What are the output capacities of the IC693PWR321?
A2: It provides +5 VDC at 15W, +24 VDC isolated at 20W, and +24 VDC relay at 15W, with a total combined output of 30W maximum.

Q3: Where must the IC693PWR321 be installed in the system?
A3: It must be installed in the leftmost slot of all baseplates.

Q4: What protective limits does the IC693PWR321 have?
A4: The +5 VDC output has overvoltage protection at 6.4 to 7V and overcurrent protection at 4A maximum.

Q5: What is the holdup time for the IC693PWR321?
A5: The holdup time is 20 milliseconds minimum.

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