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Series 642
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.
603685EA
INSTALLATION
Signal
Description
type
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
Do not perform ZERO as long as pressure gauge
voltage is shifting.
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.
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).
Edition 2013-08-22
Priority
2)
1
2)
4
N/A
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