Cradle Electronics

The cradle electronics section of this manual contains descriptions of the cradle electronics for the DEIMOS Spectrograph. It corresponds to the Cradle Electronics tab in the electronics schematics binder.

Motion Warning & Movement Alarm, EL-3108

Schematic: deimos\MOTION.SCH.pdf
Page last updated: August 13, 2002

Slimplified Diagram

This schematic shows the output bits that control the motion warning and the movement alarm outputs. As with the other general I/O of the DEIMOS spectrograph, the I/O bits activate Opto-22 relay modules. In this case, output bit 22 of controller #0 toggles channel 5, an AC output relay, to turn off and on the movement warning AC socket. Output bit 23 toggles channel 6, also an AC output relay, to turn off and on the motion alarm AC socket. The AC sockets are intended to turn on/off appropriate warning devices. During development of the instrument, the movement alarm signal controlled a rotating beacon device. Obviously, this is not practical at the telescope and implementation is left to Keck. For the movement warning buzzer, the software pulses the signal before the instrument starts to rotate. The output AC socket labled AC3 is available for this function. The motion alarm signal is turned on when the actual movement begins and toggles back off when the rotation drive signal is turn off. The output AC socket labled AC4 is available for this function.