Power Connector - LC Packings SWITCHOS II User Manual

Installation and Getting Started
VALVE A(B) - these two pins control the two switching valves. An open contact
closure or an inactive TTL (or open collector) output will drive the corresponding
valve into position "1-2", while an active input will drive the corresponding valve
into position "10-1". The current positions are indicated by the LEDs on the front
panel (FIGURE 1-2).
SSV – this pin is used to select the position of the SSV. An active input signal
shorter than 1.5 seconds will switch the valve to the next solvent channel (from
A to B, B to C, ... and finally from D back to A). Additionally, the SSV can be
reset to solvent channel A by applying an active signal for longer than
1.5 seconds. FIGURE 2-8 shows the timing diagram. The selected solvent
channel is indicated by one of the four LEDs on the upper front panel (FIGURE 1-
2).
active
inactive
FIGURE 2-8 Timing Diagram of the SSV Input

2.5.2 Power Connector

Connect the Switchos to the power line as described in Section 2.3.6.
Danger: The Switchos must be connected to a power source that is connected to
DANGER
a true ground.
2-8
Step to next
Channel
t t +1 s
1 1
D850R3
Reset to
Channel A
t t
t +3 s
+2 s
2 2
2
User's Manual Switchos
T