Led Sequence Of Operation - ECD Brake Board Operation Manual

2.5 LED Sequence of Operation

Fitted to the Brake Board are 3 LED's which can be used to follow the sequence of operation
of the board. The LED's are red, green and yellow.
During standby state both the red and yellow LED's are illuminated.
During T1 operation only the red LED is illuminated.
During T2 operation only the green LED is illuminated.
During T3 operation the red and green LED's are illuminated.
During T4 operation no LED is illuminated.
During V1 operation all LED's are illuminated.
Vmax
RED
LED
T1
Figure 6
The graph shows the LED sequence of operation from when BK SIGNAL is triggered
Flashing yellow LED indicates the brake board is in the following fault state;
 Loss of AC SUPPLY. "Loss of AC!" will be displayed on the LCD. (No AC voltage at
AC SUPPLY). Brake board will remain inoperative until AC SUPPLY restored.
Flashing red LED and illuminated yellow LED indicates the brake board is in the following
fault state:
 Triac shorted. "Triac damaged!" will be displayed on the LCD. (Fault detected with
Triac). This fault is a fatal error and requires a 24VDC reset. Note: If a triac fault is
detected while the brake board is operating, the brake board will finish the run and set
the Triac damaged fault when BK SIGNAL turns off.
GREEN
LED
RED & GREEN LED
T2 T3
RED,YELLOW,GREEN LED
V1
12
ALL LED'S OFF
T4