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SG-60 High Intensity Strobe System 3-3 Manual EPM-00000019 Rev A
WARNING!
HIGH VOLTAGE is on the energy storage capacitors C1, C2, C3A and
C3B when the High Voltage Indicator DS1 indicator is lit! (DS1 is the
neon lamp located on the High Voltage & Trigger board - do not
confuse the High Voltage Indicator DS1, with the PWR ON lamp DS1.)
It is possible to have high voltage on the energy storage capacitors
even if all AC power has been removed from the system, even though
the system is designed to drain the energy storage capacitors when
power is removed.
3.2.1 SGF-60 Motherboard
The Motherboard has no active components. It provides the necessary connections
between the external power and control wires and the Digital and Trigger/High Voltage
Cards.
It provides card edge sockets for the Trigger/High-Voltage Board (J1) and the Digital
Board (J2). Logic signals enter the motherboard through the J3 cable connector. Most
of the fast-on terminals (E1-E10) are used for high voltage and/or high-current
connections.
3.2.2 SGF-60 Digital Board
The digital board is responsible for coordinating all the activity within the Flashhead.
The microcontroller U6 is the main processing units of the Flashhead. It receives,
interprets, acts on, and replies to commands from the Master Controller. It also
controls the energy selection relays, reads the manual mode select switches, controls
the flashtube triggering, monitors the flash current. In the absence of any signals from
the Master Controller, it will autonomously operate the strobe in Day Mode.
The following is a simplified sequence of events from the perspective of the Digital
Board:
1. Wait to receive a flash request from Master Controller
2. Wait for next AC zero-crossing
3. Send trigger request signal to Trigger/High-Voltage Board
4. Check flash feedback current
5. Transmit a reply to Master Controller if the flash request was addressed to this
Flashhead number and flash status is good.
6. Set K1, K2 Relays for next flash mode (Day, Twilight, Night)
7. Update Indicators DS2, DS3