Bleeder Circuit; Diagnostic Circuits - TWR Lighting E-1DBSL Manual

DUAL MEDIUM INTENSITY LED/STROBE
3.7

BLEEDER CIRCUIT

The bleeder circuit is the most important safety item in this system. It consists of
resistor R32 connected to the high voltage storage capacitor through relay K2. When
the AC line voltage is turned off, the relay will close allowing the resistors to
discharge the high voltage stored in the capacitor banks below 50V in 30 seconds.
NEVER RELY ON THIS CIRCUIT TO RENDER THIS SYSTEM
HARMLESS.
HAZARDOUS HIGH VOLTAGE CHARGE TO REMAIN ON THE
STORAGE CAPACITORS. ALWAYS WAIT AT LEAST 30 SECONDS
AFTER POWER HAS BEEN TURNED OFF BEFORE STARTING ANY
WORK ON THIS SYSTEM. ALWAYS MEASURE THE VOLTAGE ON THE
STORAGE CAPACITORS WITH A VOLTMETER BEFORE STARTING
ANY OTHER WORK ON THIS SYSTEM. NEVER ATTEMPT TO DEFEAT
THE SAFETY INTERLOCKS.
3.8

DIAGNOSTIC CIRCUITS

The diagnostic circuit is provided as a means of making system checks and
maintenance more convenient. This circuit is entirely contained on the printed
circuit boards PCB #1 and PCB #2. The circuits that are contained on PCB #1 and
PCB #2 are as follows:
3.8.1 Control Power On (PCB #1, LED4)
M.2006 MANUALS.E-1DBSL
REV. 08/10/04, 12/09/05, 2/08/06, 04/11/06 (load resistor)
REV. 06/21/06 (part numbers), 7/13/06 (Appendix & 6.0 Major Comp. List)
REV 10/20/06 (Appendix & parts lists)
REV. 04/10/07 (text)
MODEL E-1DBSL
**CAUTION**
ANY DEFECT IN THIS CIRCUIT COULD ALLOW A
Line from the 120V AC input is sent through safety switches CSS, BSS,
isolation transformer T2, fuse F3, and Relay K1 to PCB #1. Once this low
voltage is at PCB #1, it is sent to a step down transformer, then it is rectified,
then sent to LED4 (D15).
STLDBEACON opened, controller door open, blown F3 fuse, failed relay,
etc.) LED4 would be extinguished.
If for any reason power is interrupted,
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