E-2/3DB CONTROLLER
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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. 16
the capacitors are at full charge but, dims with the discharging of the
storage capacitors. A constant intensity indicates that high voltage is
present but capacitors are not discharging (check other indicators for
fault). When the red LEDs fail to glow, then the high voltage is no
longer present.
3.7.3 Trigger Voltage
The trigger voltage from fuse F41 (PCB #4) is sent to current limiting
resistor R1, and LED6 (D11). Under normal circumstances, the red
LED should be at full intensity, indicating voltage to be normal. An
absence of this indication means that the voltage is no longer
present.
3.7.4 Nightmode
Output voltage from the photocell (SSR) is connected to the coil of
relay K4 on PCB #3. Whenever the photocell senses the darkness,
or switch SW1 is on, relay K4 will energize, thereby sending 120V to
relay U2. Relay U2 will supply 12V DC to the timing circuit as well as
LED7 (D7). LED7 will glow a constant red when in the nightmode.
3.7.5 Primary Timing
The primary timing pulses are received at LED8 (D12). LED8 will
flash according to the pulses received from the timing circuit. If LED8
fails to flash, then the primary timing circuit has failed. Check LED9
(D28) for secondary timing operation. The strobe unit should produce
40 (+/- 2) pulses per minute in daymode or nightmode back-up
operation. The strobe unit in nightmode operation should produce 22
(+/- 2) pulses per minute.
3.7.6 Timing Signal Verify
Timing pulses (either primary or secondary) are received at LED9
(D28). The LED will flash according to the pulses received from the
timing circuit. In the unlikely event that this LED is out, then total
timing failure has occurred.
3.7.7 Flash Verified
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