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Installation
B344-21-880 Issue N
3.6.4 Connect the high-vacuum isolation-valve position indicators
(63/150P and 100/300P only)
The high-vacuum isolation-valves on Diffstak 63/150P and 100/300P pumps have two position indicators. Refer to
Section 2 for details of the electrical specification of the position indicators and the cables. Each position indicator
has a 3 m long cable connected to it; connect the two wires in each cable to your control equipment:
z The position indicator closest to the valve-plate is normally open and closes when the high-vacuum
isolation-valve is closed.
z The position indicator farthest from the valve-plate (at the other end of the pneumatic cylinder) is normally
open and closes when the high-vacuum isolation-valve is open.
Figure 16 - Position indicator connections (160/700P and 250/2000P only)
3.6.5 Connect the high-vacuum isolation-valve position indicators
(160/700P and 250/2000P pumps only)
The high-vacuum isolation-valves on Diffstak 160/700P and 250/2000P pumps have two position indicators. Each
position indicator is a microswitch, with common, normally open and normally closed terminals. One of the
microswitches closes when the high-vacuum isolation-valve opens and the other microswitch closes when the
high-vacuum isolation-valve closes. The locations of the microswitches on the valves are shown in Figures 23 and 24.
Use the contacts on the microswitches to connect the microswitches to your control equipment; you can solder wires
to the microswitch terminals.
If you cannot identify the terminal markings on a microswitch, refer to Figure 16. As shown in Figure 16: the terminal
nearest the actuator is the common terminal; the terminal at the other end of the microswitch is the normally closed
terminal; the terminal in the middle of the microswitch is the normally open terminal.
1. Microswitch actuator
2. Terminal (common)
3. Terminal (normally open)
4. Terminal (normally closed)
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