VAT Series 651 Installation, Operating, & Maintenance Instructions page 32

Pin Function
3 ZERO
19
LEARN
18 LOCK
6 DIGITAL GROUND
4
DIGITAL COMMON
1) All digital inputs are digitally filtered. Filter delay is 50ms. This means that digital signals must be applied for
at least 50ms to be effective. Refer to «Function and wiring» for details about input circuit.
2) Highest priority is 1. Functions with lower priorities will not be effective as long as higher priority functions
are active.
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
Installation, Operating & Maintenance Instructions
Series 651 DN 320-400 (I.D. 12" - 16"), Logic
Signal type Description
This function compensates the pressure gauge offset voltage
and sets the pressure value to zero. In case of a 2 sensor
system both sensor inputs will be adjusted.
This function is initiated by the 'off' to 'on' transition of the
optocoupler.
If 'on' remains established this will not re-initiate the function
Digital
and does also not block functions with lower priorities.
1)
Input
Note: Do not perform ZERO as long as pressure gauge voltage
is shifting.
Note: Do not perform ZERO, if the base pressure of your
vacuum system is higher than 1%o of sensor full scale. We
recommend disabling ZERO function in this case. You can
disable the function in local operation via service port.
The LEARN routine determines the control characteristic of the
vacuum system.
This function is initiated by the 'off' to 'on' transition of the
optocoupler. A transition from 'on' to 'off' while the routine is
running would stop it.
Digital
While running, the routine may not be interrupted by another
1)
Input
function with higher priority. If 'on' remains established after
completion this will not re-initiate the function and does also not
block functions with lower priorities.
Note: Without a LEARN data set the PID controller is not able
to perform pressure control.
This function locks the valve in remote operation. In case the
valve is in local operation it will turn to remote operation. Local
operation via service port is not possible when LOCK is
Digital
1) activated.
input
When the signal is released the valve remains in remote
operation but local operation may be activated via service port.
Ground for all digital inputs. Ground is used when digital inputs
Digital
are operated by switches. Connect switches to ground.
ground
Refer also to «Function and wiring» configuration a).
Common for all digital inputs. Common is used when digital
inputs are driven by voltage sources. Connect + or – terminal of
Digital
source with common (input optocouplers are capable of
common
bidirectional operation).
Refer also to «Function and wiring» configuration b).
Priority
1
4
N/A
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2)
2)