LS PLC XGP-ACF2 Programmable Logic Controller XGT Series Power Module XGP-ACF2 XGP-ACF2 XGPACF2

LSIS XGP-ACF2 | XGT Series PLC Power Supply Module — AC100–240V Universal Input, DC5V 6A Output ±2%, ≤20A Peak Inrush, 50/60Hz, 0.4kg

Overview

The LSIS XGP-ACF2 is the universal-input AC power supply module for the XGT-series programmable logic controller platform from LS Electric (formerly LSIS).

It occupies the power module slot on the XGT base unit, converting AC mains power into the stable 5VDC supply that all modules installed on the same base — the CPU module, digital and analog I/O modules, special function modules, and communication modules — draw from the backplane bus.

The XGT platform is LSIS's high-performance modular PLC product line, positioned as a mid-to-large scale automation controller competitive with Siemens S7-300/400, Mitsubishi Q-series, and similar European and Japanese platforms.

Within the XGT's module ecosystem, the XGP-ACF2 is one of several power supply options — the universal-input variant that accepts both 100VAC and 240VAC supplies without any manual voltage selection switch, making it suitable for global deployment across 100V (Japan, some US applications) and 230V (Europe, most Asian markets) power infrastructure without hardware modification or the risk of miswiring that comes with voltage-selectable supplies.

The "free voltage" characteristic of the XGP-ACF2 is its primary practical advantage over voltage-specific power modules like the XGP-AC23 (220V fixed input) or XGP-DC42 (DC24V input).

Machine builders who deploy the same XGT-based control panel in multiple markets, or system integrators who standardise on a single power module part number for all installations regardless of local supply voltage, benefit directly from the XGP-ACF2's ability to accept the local power without configuration. 

The input range of 85–264VAC covers not just the nominal 100V and 230V/240V standards but also the variations around those standards — low-voltage supply conditions, generator output variations, and the non-standard voltages found in some industrial facilities are all within specification.

Key Specifications

DC5V Output and Load Current Planning

The XGP-ACF2 delivers 6A at 5VDC — a total of 30W available to all modules on the same XGT base unit. Each XGT module type has a defined 5VDC current consumption, typically ranging from 0.1A for simple digital I/O modules to 0.96A for high-performance CPU modules.

The system integrator must plan the total current budget before finalising the module selection: the sum of all modules' 5VDC current draws must not exceed the XGP-ACF2's 6A capacity.

This current budget calculation is an essential step in XGT system configuration.

Omitting it risks an underpowered rack — a condition where all modules appear to power on but where marginal supply voltage causes intermittent communication failures, data errors, or module resets under full operating load.

LSIS's XGT system documentation includes a current consumption table for each module type, and the XGT series configuration tools automate the calculation when the system is designed in the LSIS engineering software.

For example, a configuration with one XGI-CPUU CPU (0.96A), twelve digital I/O modules averaging 0.2A each (2.4A total), and two communication modules at 0.3A each (0.6A) would consume approximately 3.96A — well within the XGP-ACF2's 6A capacity, leaving 2A of headroom for additional modules or future expansion.

If the expanded configuration were to approach 6A, the next option in the LSIS power module family — the XGP-AC23 (220V input, 8.5A output) — provides additional current headroom for larger configurations.

Inrush Current and Upstream Protection

The specification of ≤20A peak inrush current at power-up is the parameter that determines the correct sizing of the upstream circuit breaker or fuse protecting the XGP-ACF2's supply circuit.

Inrush current is the brief surge that flows when the power supply's input filter capacitors charge from zero voltage at power-on — a well-known phenomenon in switching power supplies that can be many times the steady-state operating current.

At 20A peak inrush, the upstream protection device must be selected with an appropriate time-delay characteristic: a fast-acting fuse sized close to the steady-state operating current would trip on the inrush pulse.

Instead, a time-delay (slow-blow) fuse or a circuit breaker with a D-curve or Type D characteristic (which tolerates brief high currents on energisation) is the correct choice.

The 20A peak specification gives the protection designer the data needed to select a device that allows normal power-up while still providing the overcurrent protection required by the installation standard.

In installations where multiple XGT racks power on simultaneously — after a facility power restoration following an outage — the combined inrush from all power supplies must also be considered at the distribution panel level.

Universal Input Advantage — Global Deployment Without Hardware Changes

The AC85–264V input range of the XGP-ACF2 deserves particular attention because it directly addresses a recurring practical problem in industrial automation hardware procurement: voltage compatibility across different markets.

Japan operates at 100VAC (AC85–132V range). North America at 120VAC. Most of Europe, Asia outside Japan, and many other regions at 220–240VAC (up to 264V). A machine or control panel that will be manufactured once and deployed in multiple markets — or that may be shipped to a different facility than originally intended — must either carry the correct power module for each market, or use a universal-input module that accepts all of them.

The XGP-ACF2 accepts all of these without any hardware change or rewiring. The same module ships from inventory, installs on the base, and operates correctly whether the panel is powered from a Japanese 100VAC outlet, a European 230VAC supply, or a North American 120VAC circuit.

This universality eliminates the stocking requirement for market-specific power modules and removes the risk of installing the wrong variant — a mistake that can damage the supply or other modules if a 220V-only module is connected to a 100VAC supply, or simply fail to operate if a 100V-only module is connected to 220VAC.

FAQ

Q1: The XGP-ACF2 has a 6A output. What happens if the total module current exceeds this limit?

Exceeding the XGP-ACF2's output current capacity will cause the 5VDC rail voltage to drop below the regulation limit (DC5V ±2%), which the power module's internal protection circuitry detects.

Depending on the severity and duration of the overload, the supply may enter a current-limiting mode (holding output current at maximum and allowing voltage to sag), or it may shut down to protect itself from thermal damage. 

In either case, the PLC system will not operate reliably — modules may reset, communication errors will occur, and CPU operation may be unpredictable. Always verify the total current consumption of all installed modules does not exceed 6A before energising the system.

Q2: The XGP-ACF2 is rated for AC100–240V. Does it require any switch setting to select between 100V and 220V operation?

No. The XGP-ACF2 is a "free voltage" or wide-input universal supply — it automatically operates across the full 85–264VAC input range without any manual selector switch. Connecting it to any AC supply within this range simply works.

Unlike some older industrial power supplies that required a physical voltage selector switch (with the consequent risk of incorrect setting), the XGP-ACF2 contains input-side power electronics that automatically regulate the output regardless of input voltage within the specified range.

Q3: The inrush current is specified as 20A peak or lower. Does this mean the current could be less than 20A?

Yes — the "20A peak or lower" specification is a maximum, not a guaranteed value.

The actual inrush depends on the specific phase angle of the AC supply at the moment of switch-on, the temperature of the input filter capacitors (cold capacitors accept more charge, generating higher inrush), and the line impedance.

At the moment of power-on when the AC supply voltage is at its peak, inrush is typically highest. At zero crossing, inrush is minimal.

In practice, the inrush is unpredictable at any given power-on event, and the protective device selection must accommodate the worst-case 20A peak.

Q4: Can the XGP-ACF2 be used with XGR redundant PLC systems, or is it only for standard XGI systems?

The XGP-ACF2 is compatible with both XGI standard configurations and XGR redundant CPU systems within the XGT platform.

In XGR redundant configurations, each chassis has its own independent power module — the XGP-ACF2 powers its own base's modules independently of the redundant chassis's power supply.

The LSIS XGT documentation specifies which power modules are approved for use with each CPU type and system configuration; the XGP-ACF2's 6A output capacity is sufficient for standard base configurations in both XGI and XGR systems, with the actual current consumption depending on the specific module population.

Q5: The output is DC5V ±2%. What does the ±2% tolerance mean for module compatibility?

The ±2% tolerance means the output voltage is guaranteed to remain between DC4.9V and DC5.1V under all specified operating conditions (within the input voltage range, within the rated output current, and within the operating temperature range).

All XGT series modules are designed to operate correctly anywhere within this ±2% range.

The tight ±2% regulation is important for digital logic modules whose threshold voltages have defined margins above and below the nominal supply — if the supply voltage drifts outside this range, logic levels may become marginal, causing intermittent communication errors or logic failures. 

The XGP-ACF2's regulation circuitry maintains the output within ±2% actively, compensating for load current changes and input voltage variations.