# Zeiss HV Interlock It uses this cable and the airlock port. On older [[zeiss]] (LEO), opening the interlock would close the isolation valve. It also would not let the IGPs start up without the interlock plugged in. This is probably the same behavior for modern ones as well. ![[Pasted image 20220531112551.png]] # Some BS that might be useful for figuring out pinout What follows is maybe not the easiest to adapt to an interlock pin out, but it could be helpful. There are a few places where they call out specific pin outs though. ## 6.1.         Hardware Configuration for External Devices ### 6.1.1.    General The External Device Interface is used for EDX and Airlock control.  With this interface you can on each connector do the following: · Read 4 optically decoupled input data signals · Control 4/(3) external devices via relay contacts or opto-isolated open collector outputs · Control external interlock chains through separation valve interlock status and EHT interlock status (filament clearance) · Influence the Vac internal functions from external devices through access to separation valve control and ventilation valve control via interlock chain. _All status and input/output functions are displayable on VAC-GUI._ ### 6.1.2.    Installation #### 6.1.2.1.   Required Parts ·       Airlock Piggyback Kit 348224-8801 - (contains: 3 +1 PCB’s , 7 cables and 4 plugs as terminators) ·       VAC Firmware version 971128 or later. ·       VAC board must have mod version 1 dated of 16.09.97 or later. #### 6.1.2.2.   How to Install 1) Switch OFF System 2) Check VAC board = mod version 1 or modify 3) Check 4 fuses for ext. device connectors present (680mA < limit current < 2A ) 4) Plug in cables for board connection into -9028 PCB 5) Connect all Piggyback PCBs with cables as shown in sketch below (take care with pin 1) 6) Terminate last -9029 Piggy PCB with jumpers from –9028 7) Plug PCBs into VAC board (Start with AUX *X14*) 8) Connect PCBs via cables to console or Plinth 9) Terminate each PCB with plug,  either on cable or on PCB itself 10) Remove plug X8 from VAC board 11) Connect -9028 cables to VAC board X8 and X17 12) Connect separation valve cable to X17 on –9028 ### 6.1.3.    Required Mod for VAC board version 348224-9013 (Mod 1) If you have a VAC board 348224-9013 pre-series version or older, take notice of the below described details if you integrate the necessary parts into the instrument to interface external devices (Mod version 1 delivered est. after Jan '98.) #### 6.1.3.1.   Required Parts Resistor 100 Ohm wired Resistors 2k1, 4K99, 681 Ohm, in SMD (surface mount), or if not available use standard resistors. #### 6.1.3.2.   Mod Details from Pre-series Origin to Version 1 - R186 change from 1K to 2K21 (part number 300-571 to 300-573) - New Rxx 100 Ohm from Pin X21, C8 to Pin D30, A1 - (part number 075-581, advantageous on solder-side) - Add R293, R294 (both 0R0) if not assembled - part number 149-966 (you can use previously removed resistors) - Remove (if assembled) R269, R270; R287, R288; R323, R324; R363, R364 - Change R57 from 4K7 to 4K99 (part number 300-660) - Change R24 from 100Ohm to 681 Ohm (part number 301-011) (Remark: MOD Version 1 = 0.60 on BV_D1) Only marked parts directly affect external device functions.) ### 6.1.4.    Board Repair and Modification Instructions To avoid overheating the PCB and resistors please follow this recommendation. To remove resistors manually from the VAC board please use two 30W handheld soldering irons with thin tips. Touch the resistor simultaneously at both ends and lift it up as the solder melts.  To solder a resistor onto the board, use a thin pair of tweezers and a thin solder tip. Clean both the pads.  Temporarily fix one end of the resistor to the board. Fix other end with additional solder.  Now re-solder the first end to ensure a good connection. ### 6.1.5.    Special Notes Piggyback PCB -9028 (used for WDX) is not integrated into the external separation valve (sepValve) and vent valve (ventValve) interlock chain.  Only the in/output functions are available.  WDX  is not available at present. Interlock feedback is only possible for the vent valve Interlock chain once at the valve end (no single device interlock detectable, no EHT interlock detectable). The first connection drawing sent to our suppliers shows a mistake on the last page (examples) for separation valve status.  The correct configuration should be: Pin 3 and 4 are shorted if separation valve is closed, Pin 3 and 5 are shorted if separation valve is open. Piggyback interconnection cables have 10 wires, but only 8 are used. ### 6.1.6.    Where to find the connectors on VAC board (Top view) >[!Figure 6.3] ![[Pasted image 20220531113329.png]] ### 6.1.7.    How to Connect the Piggyback PCBs WDX to VAC board (X7 to X17), (X8 to X8) WDX to others: ·       WDX:  X3 to EDX X4 (Pin1 to Pin1); ·       EDX: X3 to Airlock.  X4 (Pin1 to Pin1); ·       Airlock: X3 to AUX X4 (Pin1 to Pin1); ·       AUX terminate on X3 (short 1,2 and 5,6) ·       Sep Valve to WDX X17 If PCB is not in use: Pins 1,14 and 6,7 must be shortened in terminator plug.