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xxx
This is the final motor rack PC: an industrial enclosure with a set of
ISA-based cards. (The "extra" temporary PC used in tower in phase 1
will eventually act as a "live" backup spare and it will be equipped
with identical boards as the rack PC.) The following equipment will
be needed:
- An EC-1120 enclosure (FIM 1891); we already have one for
motor rack PC.
- A CISA-486H CPU card (FIM 1761).
- An AMD486DX4-100---120 processor (about FIM 500).
- A heat sink without fan for the processor.
- A 16MB SIMM RAM memory module (about FIM 650).
- A floppy disk drive (about FIM 200).
- An 3.5" IDE hard disk drive. We will use some extra drive we
already have---capacity is not critical. In the final version the
hard disk will be replaced by a non-volatile solid-state flash EEPROM
disk such as PC-FD-10 10MB flash disk card (FIM 2337).
- A temporary VGA card plus a temporary VGA monitor. The
possibility of buying a small monochrome VGA display such as the
9" FT-7112 (FIM 997) will be considered---it would be nicer to handle in
tower.
- A temporary keyboard; we already have it.
- An IK121 Heidenhain RON806 interface card; we already have
two of them.
5MHz/1pps/PWM-out/watchdog
xxx new ISA board made in-house (by Jouko :-) with MACH chips...
Quadrature Encoder Input (4 diff.)
xxx digital tachometers (Heidenhain xxx) of the motors
Space for a future secondary mirror position sensor input board
xxx LVDT, optical, ...
16-ch. 16-bit A/D
This is a 16-channel 16-bit A/D converter card such as ET-2816 (FIM
2863) which will read the tiltmeter outputs and a few temperature
sensors inside and outside the PC. Adapter card ETD-8125 (FIM 441)
plus a D37 cable (ET-10137-1, 1m, shielded, FIM 113) has screw
terminals for tiltmeter open ended cable and this has been used in
temporary phase 1 installation.
xxx sensors:
- Ttilt
- x-tilt
- y-tilt
- T-PC (separate LMxx sensor arrangement (with +/-15V power))
- 5*Tfet (from Euro bus motherboard)
- 7 spares
16-ch. 12-bit A/D
xxx voltages, currents
- 4*28V power
- 24V power
- 5*Imotor
- 5V power, +12V power, -12V power?
- brake power?
- 2*fan voltage
- 0--2 spares
6cn*3*8-bit Digital I/O
An ET-1722B digital I/O card (FIM 919) for:
- Absolute ROC412 encoders (2cn*3*8 bit).
- Soldered interface cable for converting ROC412 open cable end
to 50-pin ribbon cable connectors.
- 24-bit opto in (1cn*3*8 bit)
- Interlock, safety limit switches.
- Approx. 6-bit direct out
- FET driver board enable control output bits (these go to
PWM driver/watchdog/interlock circuitry).
- Approx. 8-bit direct out
- Secondary mirror motor switcher control output bits.
xxx
xxx
Motherboard
xxx
5*FET-kortti
xxx
FET Driver Board Enable and Watchdog Controller
- Interlock GAL
- ULN-chip based driver for 24V relays driving motor contactors
- Motor contactor relays
xxx connects to both 5M/1pps/PWM/watchdog ISA board and to digital
output ISA board.
Secondary Mirror Motor Switcher
- Interlock GAL (prevents driving multiple motors at the same time).
- ULN-chip based driver for 24V DPDT(?) relays selecting one
motor to be connected to one FET board.
xxx connects to digital output ISA board.
Space for secondary mirror position sensor signal processing circuitry
xxx
xxx 4, secondary mirror motors have their own switcher
xxx
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