The Q64P is Mitsubishi Electric’s high-capacity wide-input-range power supply module for the MELSEC-Q programmable controller series, delivering 6 A at 5 VDC from an AC input voltage range of 100 to 240 VAC — the widest input voltage range available in the standard MELSEC-Q power supply module family. Designed for international installations and systems where the site supply voltage may vary significantly or where a single power supply module specification must cover both 100 VAC (North American and Japanese grid) and 230 VAC (European and industrial grid) installations without hardware changes, the Q64P eliminates the need to stock separate power supply modules for different regional voltage standards. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the Q64P?
The Q64P is a MELSEC-Q series power supply module providing 6 A of regulated 5 VDC output to the base unit’s internal bus, powering all CPU and peripheral modules installed in the same base. It occupies the dedicated power supply slot (leftmost position) of any MELSEC-Q main base unit (Q33B, Q35B, Q52B, Q55B, Q63B, Q65B, Q68B, Q312B) and is not compatible with extension base units, which draw power from their own dedicated power supply modules. The Q64P’s 100–240 VAC universal input eliminates the manual voltage selector switch found on older MELSEC-A series power supplies, automatically adapting to the connected supply voltage within its rated range. An integrated output voltage monitor circuit continuously checks the 5 VDC bus voltage and initiates a controlled CPU STOP and power-off sequence if the output voltage falls outside the acceptable operating window, protecting the CPU’s program memory and I/O module outputs from data corruption during brownout conditions.
Key Technical Specifications
- Model: Q64P
- Output Voltage: 5 VDC
- Output Current: 6 A (maximum)
- Input Voltage Range: 100 to 240 VAC (universal, auto-ranging)
- Input Frequency: 50/60 Hz
- Inrush Current: 20 A maximum (at 200 VAC, cold start)
- Power Consumption: 110 W maximum
- Output Ripple: 120 mV peak-to-peak maximum
- Overcurrent Protection: Yes (automatic shutdown and restart)
- Overvoltage Protection: Yes
- Operating Temperature: 0°C to 55°C
- Compatible Base Units: All MELSEC-Q main base units
- Weight: Approx. 0.50 kg
Architecture & Design Overview
The Q64P uses a switched-mode power supply (SMPS) topology with power factor correction (PFC) to achieve high conversion efficiency across its wide input voltage range. The PFC stage maintains an input power factor above 0.95 at full load, reducing reactive current draw on the site electrical supply — an important consideration in industrial installations with multiple automation cabinets sharing a common supply transformer. The 5 VDC output is regulated by a closed-loop feedback circuit that maintains output voltage within ±2% of nominal under all load conditions from 0 A to 6 A. The Q64P includes a 24 VDC service output terminal (approximately 0.3 A) for powering external indicator lights or relay coils directly from the PLC power supply, eliminating the need for a separate 24 VDC supply for simple auxiliary circuits. The power supply module communicates its operational status to the CPU via a dedicated signal line on the MELSEC-Q internal bus — if the power supply enters a fault condition, the CPU is notified before the 5 VDC bus collapses, allowing the program to execute an orderly shutdown sequence and set output safe states before power is lost.
Troubleshooting Guide
If the Q64P’s POWER LED fails to illuminate after power-on, first verify that the AC input voltage is within the 100–240 VAC range using a multimeter — voltages below 85 VAC or above 264 VAC will prevent the power supply from starting. If the input voltage is correct, check that the power supply module is fully seated in the base unit power supply slot by pressing firmly until the locking tab engages. If the POWER LED illuminates briefly then extinguishes, the most common cause is an overcurrent condition — calculate the total 5 VDC current demand of all installed modules and verify it does not exceed 6 A. If the Q64P repeatedly trips on overcurrent despite the calculated load being within rating, check for a short circuit in the base unit internal bus by removing modules one at a time and re-powering after each removal to identify the faulty module. For intermittent power supply faults in high-vibration environments, inspect the AC input terminal block for loose wire connections — vibration-induced terminal loosening is a common cause of intermittent supply interruptions that can corrupt CPU program memory.
Frequently Asked Questions
Q: What is the difference between the Q64P and the Q61P, and when should each be specified?
A: Both the Q64P and Q61P deliver 6 A at 5 VDC, but they differ in input voltage range. The Q61P accepts 100–120 VAC or 200–240 VAC (two separate ranges, selected by internal DIP switch), while the Q64P accepts 100–240 VAC continuously without any switch setting. For international OEM machine builders supplying equipment to multiple global markets, the Q64P is strongly preferred as it eliminates the risk of incorrect voltage range selection during installation or maintenance. For fixed single-voltage installations, either module is suitable.
Q: Can the Q64P power a Q68B main base with all eight peripheral slots fully populated?
A: Yes, provided the total 5 VDC current consumption of all eight modules does not exceed 6 A. Calculate the sum of each module’s 5 VDC current draw from the respective hardware manuals. A typical worst-case configuration of eight QX41 digital input modules draws 8 × 0.15 A = 1.2 A — well within the Q64P’s capacity. High-current modules such as QD75MH4 (0.50 A) or QJ71LP21-25 (0.60 A) increase the total draw; verify the sum before finalising the power supply selection.
Q: Does the Q64P require any parameter configuration in GX Works2?
A: No. The Q64P operates autonomously without any software configuration — it regulates the 5 VDC output and monitors for fault conditions independently of the CPU program. The only GX Works2 setting related to power supply is the base unit type selection in PLC parameters, which informs the CPU of the base hardware configuration but does not affect power supply operation.
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