Yes, PCR-MA series can function as a frequency converter. You can achieve this by adjusting the output voltage (within the range of 0 to 155 V/0 to 310 V), and configuring the output frequency to your desired range (40 to 500 Hz).
Please note that only the single-phase output is available, and the three-phase output is not supported.
For the details, read the user’s manual – chapter of Voltage Setting and Frequency Setting.