Nor-Cal Intellisys Adaptive Pressure Controllers - Manual (Page 21)

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ntellIsys
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dAptIve
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ressure
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ontrollers
APC-OP-LIT 1/12
User Examples
Below are examples of the most common modes of operation. Please contact
Nor-Cal Products technical support for other types of uses.
Pressure Control
The following conditions must be true in order for the APC controller to per-
form pressure control.
1. The signal from a pressure gauge having a voltage output 0 to
10VDC must be connected to the connector labeled GAUGE.
2. There must be gas flow in to the chamber volume where pressure
control is required.
3. An analog set-point signal in the 0 to 10 VDC must be applied
across the analog set point input pins. The analog set-point
signal is directly proportional to the pressure to which the APC
will control – i.e. An ASP of 5 VDC will result in pressure control
at a gauge output of 5VDC.
4. The \Analog SP Control Select In\ pin must be pulled low. Doing
this will initiate pressure control.
Valve Position Control
Valve position (angle) control can be effected b y doing the following:
1. An analog set-point signal in the 0 to 10 VDC must be applied
across the analog set point input pins. The analog setpoint signal
is directly proportional to the target valve position, where 0 VDC is
fully closed and 10 VDC is fully open.
2. The \Position Control Select In\ pin must be pulled
low to ensure that the APC is in position control mode.
3. The \Analog SP Control Select In\ pin must be pulled low.
Doing this will initiate position control.
Open Valve
There are two ways to command the valve fully open:
1. Analog valve position control can be used, as described
immediately above, where an analog set-point value
of 10 VDC is used.
OR
2.
The \Open Valve In\ pin can be pulled low. Doing this at any
time will cause the valve to open, even if it is in the middle
of performing pressure control.
Close Valve
There are also two ways to command the valve fully closed:
1. Analog valve position control can be used, as described
immediately above, where an analog set-point value
of 0 VDC is used.
OR
2.
The \Close Valve In\ pin can be pulled low. Doing this at any
time will cause the valve to close, even if it is in the middle
of performing pressure control.
Dual Gauge Operation
For applications where there is a wide range of control pressures, the use of
two differently ranged gauges may be advantageous. All APCs support this
functionality, with the exception that some controller models cannot power
both gauges if they are both heated. Please refer to the ±15 VDC output
specifications for your particular model. The following steps must be taken
in order to perform dual gauge operation successfully:
1. The signals from two gauges of different full scale range,
both with 0 to 10 VDC output, must be connected to the
appropriate GAUGE connector(s).
2. The gauges’ full scale must be set. See N1 and N2 serial command.
3. Then follow the instructions above for Pressure Control.
The controller will use the signal from CDG1 as a default.
If the use of CDG2 is desired for pressure control, then
the \CDG2 Select In\ pin must be pulled low. The analog set
point signal will be proportional to CDG2.
7.0 - Analog / TTL Interface
(continued)
NOTE: For normal operation of - 7x0 and 8x0 series APC/IQ
controllers, the \Value Intialization Enable In\ pin must be
pulled low.