E-2/3DB CONTROLLER
E:\Documents and Settings\Administrator\Local Settings\Temporary Internet Files\OLK3\E2-3DB.doc
Rev. 01/13/00; Rev. 07/2000 o2L/H
Rev. 10/2000 (dwgs. 100239, 601, 601-01, 601-02, H02-258, 100031, 279L, 274S, 100089)
Rev. 06/21/00 (Reformatted Text; Revised Pg. 3 (2.4.1, 20 amp to 30 amp)
Pg. 15
3.6 BLEEDER CIRCUIT
The bleeder circuit is the most important safety item in this system. It
consists of resistors R32A, R32B, and R32C connected to the high voltage
storage capacitor through relays K2, and K2A. 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.
* * C A U T I O N * *
NEVER RELY ON THIS CIRCUIT TO RENDER THIS SYSTEM HARMLESS.
ANY DEFECT IN THIS CIRCUIT COULD ALLOW A 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.
3.7 STROBE 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:
3.7.1 Control Power On
Line from the 120V AC input is sent through safety switches CSS,
BSS, isolation transformer T1, and fuse F11 on PCB #1. Once this
low voltage is at PCB #1, it is rectified, then sent to LED4 (D5). If for
any reason power is interrupted, (beacons opened, controller door
open, blown F1 fuse, failed relay, etc.) LED4 would be extinguished.
3.7.2 High Voltage
The Cathode side of the high voltage HV1, HV2, and HV3, are routed
through current limiting resistors (R201, R202, and R203). When the
unit is in daymode, D14, D15, and D16 will be at full brightness when
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