Series 642
INSTALLATION
605403ED
Edition 2017-11-24
33/94
Pin
Function Signal
type
Description
Priority
3
ZERO
Digital
Input
1)
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
and does also not block functions with lower priorities.
1
2)
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.
19
LEARN
Digital
Input
1)
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.
While running, the routine may not be interrupted by another
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.
4
2)
Without a LEARN data set the PID controller is not
able to perform pressure control.
18
LOCK
Digital
input
1)
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
activated.
When the signal is released the valve remains in remote
operation but local operation may be activated via service port.
N/A
6
DIGITAL
GROUND
Digital
ground
Ground for all digital inputs. Ground is used when digital inputs
are operated by switches. Connect switches to ground.
Refer also to «Function and wiring» configuration a).
4
DIGITAL
COMMON
Digital
comm
on
Common for all digital inputs. Common is used when digital
inputs are driven by voltage sources. C or – terminal
of source with common (input optocouplers are capable of
bidirectional operation).
Refer also to «Function and wiring» configuration b).
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.
