Schweitzer Engineering Laboratories SEL-749M - Human-Machine Interface; Table 8.1 Front-Panel Automatic Messages

8.2
SEL-749M Relay Instruction Manual Date Code 20080918
Front-Panel Operations
Human-Machine Interface
Figure 8.1 shows and identifies the following regions:
➤ EIA-232 Serial Port. See Section 7: Communications for
details on the serial port.
➤ Human-Machine Interface (HMI)
➤ Operation and target LEDs
This versatile front panel supports the following features so you can customize
it for your needs:
➤ Rotating display on the HMI
➤ Programmable target LEDs
➤ Slide-in configurable front-panel labels to change the
identification of operation and target LEDs.
Human-Machine Interface
Contrast
You can adjust the LCD screen contrast to suit your viewing angle and
lighting conditions. To change screen contrast, press and hold the {ESC}
pushbutton for two seconds. The SEL-749M displays a contrast adjustment
box. Pressing the {Right Arrow} pushbutton increases the contrast. Pressing the
{Left Arrow} pushbutton decreases the screen contrast. When you are finished
adjusting the screen contrast, press the {ENT} pushbutton; this process is a short
cut for changing the LCD contrast setting FP_CONT in the front-panel
settings.
Front-Panel
Automatic Messages
The relay displays automatic messages under the conditions described in
Table 8.1.
NOTE: See the Preface for an
explanation of typographic
conventions used to describe menus,
the front-panel display, and the front-
panel pushbuttons.
Table 8.1 Front-Panel Automatic Messages
Condition Front-Panel Message
Relay detecting any failure Displays the type of latest failure (see Section 10: Testing
and Troubleshooting).
Relay trip has occurred Displays the type or cause of the trip. Refer to Table 9.1
for the list of trip display messages.
Motor running overload Displays the predicted time to thermal element trip in
seconds.
Relay alarm condition has
occurred
Displays the type of alarm. The TRIP LED is also flashing
during an alarm condition.
When a start is requested
during a lockout condition
Displays the type of lockout condition. Press the {ESC}
pushbutton to gain more information on lockout type and
lockout time remaining.
Control input set to
disable protection
Displays
Protect Disabled By Control Input.
During emergency start Displays
Emergency Start.
Courtesy of NationalSwitchgear.com