Technical Specifications

FAQ

1. What is the main function of the Honeywell 2MLR-AC22 Power Supply Module?

The Honeywell 2MLR-AC22 is an AC power supply module designed for the MasterLogic-200 PLC system. Its primary function is to convert an external AC 220 V supply into the DC 5 V power required by the PLC system, providing operating voltage for the CPU, I/O modules, and related internal circuits. This model has a rated output current of 8.5 A and an output power of 46.75 W at 55°C, making it suitable for industrial automation applications with higher power supply requirements. It also provides a RUN status relay output, allowing the control system to monitor the power supply’s operating condition.

2. What input voltage and frequency does the 2MLR-AC22 support?

The 2MLR-AC22 has a rated input voltage of AC 220 V and an allowable input range of AC 176–264 V. It is designed for AC power systems that meet these voltage requirements and supports a nominal input frequency of 50/60 Hz. Before installation, measure the site supply voltage and confirm that it falls within the specified range. This model differs from the AC 110 V input 2MLR-AC12, so the two should not be considered interchangeable simply because they belong to the same product series.

3. What are the output voltage and current ratings of the 2MLR-AC22?

The module provides a DC 5 V output with a voltage tolerance of ±2%, a rated output current of 8.5 A, and a rated output power of 46.75 W at 55°C. These ratings determine the power capacity available to the connected MasterLogic-200 PLC components. When configuring the system, calculate the combined power consumption of the CPU, I/O modules, and other powered units. The total load should remain within the module’s rated output capacity to prevent overload and unstable system operation.

4. Does the 2MLR-AC22 have overcurrent and input protection?

The module is equipped with a built-in input fuse and an output overcurrent protection function. The input fuse is rated at AC 250 V, 3.15 A, time-delay type, and is not designed for user replacement. The DC 5 V output has an overcurrent protection range of 9.3–17.0 A. If a short circuit or abnormal load occurs in the output circuit, the protection mechanism helps reduce the risk of damage to the module and PLC system. After a protection event, inspect the external loads, wiring, and power supply circuit. Restore operation only after identifying and correcting the cause of the fault, following the applicable maintenance procedures.

5. What is the purpose of the RUN relay output on the 2MLR-AC22?

The RUN relay output provides a power supply operating status signal. It can be connected to a PLC monitoring circuit or external alarm circuit to help maintenance personnel identify abnormal power supply conditions. Its rated switching load is DC 24 V at 0.5 A, with a minimum switching load of DC 5 V at 1 mA. The relay response time is no more than 10 ms for OFF-to-ON switching and no more than 12 ms for ON-to-OFF switching. This contact is intended primarily for status monitoring and should not be used directly to supply high-power loads.

6. How can I determine whether the 2MLR-AC22 is operating correctly?

First, check that the input terminal is connected to a suitable AC 220 V supply and that the voltage is within the AC 176–264 V range. After powering up the module, observe the power status LED. The LED should illuminate when the output voltage is normal. Use an appropriate measuring instrument to verify the DC 5 V output, and check the operating status of the PLC CPU and I/O modules. If the LED remains off, the output voltage is abnormal, or the PLC system fails to start, inspect the input power supply, external wiring, connected loads, and module protection status.

7. Can the 2MLR-AC22 replace the 2MLR-AC12 or other Honeywell power supply modules?

These models should not be assumed to be directly interchangeable. The main difference between the 2MLR-AC22 and 2MLR-AC12 is their input voltage requirement: the AC22 uses an AC 220 V input, while the AC12 uses an AC 110 V input. The MasterLogic-200 series also includes other power supply models, such as the 2MLR-AC13, 2MLR-AC23, and 2MLR-DC42, which differ in input configuration and output capacity. Before selecting a replacement, verify the rated input voltage, output current, power capacity, base compatibility, and system configuration. Do not determine compatibility based solely on physical appearance or product series.

8. What precautions should be taken when installing or replacing the 2MLR-AC22?

Before installation or replacement, disconnect the relevant power sources and follow the PLC system’s maintenance procedures to ensure that the equipment is in a safe condition. Check the module model, installation position, and terminal assignments. Confirm that the input supply meets the AC 220 V specification, and avoid connecting the module to AC 110 V or another incorrect voltage. Use the recommended 0.75–2 mm² wire size and ensure that all terminal connections are secure to prevent overheating or voltage fluctuations caused by poor contact. After installation, check the power status LED, DC 5 V output, and overall PLC system operation. If persistent overcurrent, abnormal output voltage, or repeated protection events occur, investigate the external wiring and loads rather than repeatedly forcing the module to restart.