2.1.3 LEDs
The P15D Relay has 4 high-intensity LEDs for easy identification of fault type for easy user interface.
SL no Label Function
LED 1 ON The green LED indicates that the power is ‘ON’. (Required ≥20% of load Current) & green LED
indicates ‘Trip Block function’ is enabled or the relay is ‘OUT OF SERVICE’.
LED 2 START The amber LED is the Relay ‘START’ Indicator, and is switched on when the relay picks up on
protection functions (e.g. OC/EF)
LED 3 TRIP The red LED is the Relay ‘TRIP’ Fault Indicator, and is switched on when relay is tripped on
protection functions. This will remain on even when fault is cleared and will require a manual
reset.
LED 4 TRIP TEST The amber LED is the Relay ‘TRIP TEST’ indicator and is used to indicate whether Trip Test
function is enabled. The amber LED indicator blinks when relay is programmed in test mode.
Once switched in TEST mode, the relay remains in test mode for 15 minutes. After this time,
relay automatically returns to service mode.
2.1.4 RS 485 Port
RS485 port is provided at the rear of relay (near to terminal block) for permanent SCADA connectivity.
The separate 5 Pin connector is used to avoid accidental connection of power wiring to
communication input. The RS485 port can be used to download Fault data, Live Event, Disturbance
Record etc.
2.1.5 USB Port
The USB port is situated on the front panel in the bottom right hand corner, and can be accessed by
opening the flap on the front of the relay. This port is used to communicate with a locally connected
PC.
It has three main purposes:
• Transferring settings information to/from the PC from/to the device.
• Downloading firmware updates.
• Downloading relay data for analysis.
The port is intended for temporary connection during testing, installation and commissioning. It is not
intended to be used for permanent SCADA communications.
You can connect the unit to a PC with a USB cable up to 15 m in length.
The USB port includes a USB full-speed function controller, USB transceiver, oscillator, EEPROM, and
synchronous serial data bus (UART). No other external USB components are required.
For proper operation the user must select the correct communication port in SYSTEM DATA menu
setting.
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