Logging in to Web HMI - Arc protection - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Grid automation - Busbar differential protection (high impedance) - Line differential protection - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Interconnection protection - Generator protection - Power management/Load shedding - Operation Manual - REX615 Protection and control - Relion Protection and Control - PCL2 - IEC - ANSI - 01.04.2026

REX615 Operation Manual
  1. Open a supported web browser.
  2. Type the protection relay's IP address in the address bar and press ENTER.
  3. Type the username and password.
  4. Check the “I acknowledge and agree to the notice below” box if it is shown. (Without this confirmation, login will not be allowed)
    Figure 1. Login dialog with user-configurable legal text and acknowledgement checkbox

  5. If logging in fails because all sessions are used, an error message is shown on the login page.
    Figure 2. Web HMI error message

  6. Select the role if an additional view opens.

    This view opens if there are several user roles configured.

    Figure 3. Selecting user role

    The progress indicator is displayed until the WHMI opens and the dashboard view is shown.

    Note: It is recommended to disable the auto-complete feature, which is usually enabled by default, in the Web browser to prevent the usernames and passwords from being stored in the browser's cache.