Connecting external display module - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Installation Manual - REX640 Protection and control - Relion Protection and Control - PCL4 - IEC - ANSI - 16.02.2023

REX640 Installation Manual
Tip: Only one LHMI module can be connected to a protection relay.
  1. Connect the LHMI’s power connector.
    1. Check the permitted auxiliary voltage range from the sticker found at the rear side of the LHMI.
    2. Connect the auxiliary voltage leads to the outermost terminals of the LHMI's power connector plug. The polarity is marked on the LHMI's rear plate close to connector X3.
    3. Push the power connector plug to the bottom.
    4. Turn the locking latches to lock position to secure the connector.
  2. Connect the LHMI to the protection relay.
    1. Use a CAT6 S/FTP cable to connect the LHMI to the protection relay. See Accessories and ordering data for the cable options.
    2. Connect the cable to the X1.1/Main unit connector on the LHMI and to the X0/HMI connector on the protection relay's communication module.
Figure 1. Local HMI connectors
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1
USB port
2
RJ-45 ports