Keypad - 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 - PCL2 - IEC - ANSI

The LHMI keypad contains push buttons which are used to navigate in different views or menus. With the push buttons you can give open or close commands to objects in the primary circuit, for example, a circuit breaker, a contactor or a disconnector. The push buttons are also used to acknowledge alarms, reset indications, provide help and switch between local and remote control mode.

Figure 1. LHMI keypad with object control, navigation and command push buttons and RJ-45 communication port

1: Close
2: Escape
3: Up
4: Enter
5: Clear
6: Uplink LED
7: Communication LED
8: Open
9: Left
10: Down
11: Right
12: Key
13: Remote/Local
14: Menu
15: Help
16: Communication port

Object control

If the control position of the protection relay is set to local with the R/L button, the relay can be controlled using the object control buttons.

Table 1. Object control push buttons
Name	Description
Close	Closing the object.
Open	Opening the object.

Navigation

The arrow buttons are used for navigation. To scroll information, press the arrow button several times or simply keep it pressed down.

Table 2. Navigation push buttons
Name	Description
ESC	Leaving setting mode without saving the values. Cancelling certain actions. Adjusting the display contrast in combination with or . Changing the language in combination with . Running the display test in combination with . Deleting a character in combination with when editing a string. Inserting a space in combination with when editing a string.
Enter	Entering parameter setting mode. Confirming a new value of a setting parameter.
Up Down	Moving up and down in menus. Scrolling active digits of a parameter when entering a new setting value.
Left Right	Moving left and right in menus. Changing the active digit of a parameter when entering a new setting value.
Key	Activating the authorization procedure, when the user is not logged in. Logging out, when the user is currently logged in.

Commands

Table 3. Command push buttons
Name	Description
Menu	Moving directly to main menu, if currently in any other menu. Moving between main menu, measurements and single-line diagram views.
R/L	Changing the control position (remote or local) of the device. When the R LED is lit, remote control is enabled and local control disabled. When the L LED is lit, local control is enabled and remote control disabled. When the L and R LEDs are lit, both remote and local control are enabled. When none of the LEDs are lit, both control positions are disabled.
Clear	Activating the Clear/Reset view. Clearing indications and LEDs. The first three-second press clears the indications. The second three-second press clears the programmable LEDs. Requires appropriate user rights.
Help	Showing context sensitive help messages.