Pepperl+Fuchs 6000 SERIES Installation And Operation Manual page 31

6000 Series Purge/Pressurization System
Purging modes
Purging start-up can be set in 3 different modes:
• STD – Standard mode requires the operator to
engage the manifold solenoid valve manually
when purging and manually disengage when a
successful purging is complete.
• SA – Semi-automatic mode requires the operator
to engage the manifold solenoid valve manually
when purging. The EPCU will automatically
disengage when a successful purging is complete.
• FA – Fully-automatic mode will automatically
engage the manifold solenoid valve when safe
pressure is detected and will automatically
disengage when a successful purging is complete.
This is the factory default setting.
The minimum purge time is 1 minute.
During the purging cycle, when the enclosure
pressure reaches 0.25" wc [(6.4 mm wc),
Note
(0.625 mbar), (62 pa)] or higher, there will be
a 5 second delay before the rapid exchange
solenoid valve is activated. If the flow is enough
through the vent to satisfy the required flow rate
setting, then the timer will begin after 1 min.
The update of the timer is in increments of 1 min
in the Fixed Purge Time and % completed in the
Dynamic Purge Time.
Pressure as Input
In the programming menu under "INPUT SETTINGS"
for the optional pressure control. The pressure control is
achieved within the enclosure by opening and closing a
digital valve or manifold on the 6000 control unit. These
two internal pressure set points can be controlled by the
manifold or an outside source for pressure. The pressure
function can manage the control outputs 1 or 2, or the
control valve (manifold valve).
• The "ON PRESSURE" is the lowest pressure you
want in the enclosure and will start the control
action on when pressure goes below this value.
• The "OFF PRESSURE" is when the valve shuts
off. When the pressure is between these two
values, nothing will happen.
• The "ON PRESSURE" function is active until the
"OFF PRESSURE" is reached
This function does not operate during purging
cycle and only operates after purging and
Note pressurization.
The "ON PRESSURE" always has to be lower
than the "OFF PRESSURE". This cannot
be reversed.
Note
PRESSURE AS INPUT
OFF PRESS
Set PRESS
ON PRESS
I.S. Inputs 1 - 4
There are (4) intrinsically safe inputs for activation
of various outputs and actions by the EPCU. These
inputs only accept a dry contact for activation and are
supplied by the EPCU's galvanically isolated barrier. The
configurations of the inputs for various actions are done
through the user-interface controller. Only one function
can operate per input. The intrinsically safe inputs can
be configured through the UIC to activate the auxiliary
relays, energize the Rapid Exchange valve, de-energize
the enclosure contacts, and shut the system down, as
well as other actions and outputs. To monitor wiring, the
SRM-6000 (sensor resistor module, not required, ordered
separately) can be added to detect shorts or breaks in
the inputs' wiring to the contacts.
Outputs
Enclosure 1 and Enclosure 2
There are (2) normally open dry contacts for the
enclosure power that can be energized only after a
successful purging and a minimum enclosure pressure
is maintained. Loss of pressure will cause the contacts
to de-energize unless the shutdown timer is activated or
bypass mode is implemented. These contacts operate
simultaneously.
Auxiliary 1 and Auxiliary 2
Also available are the Auxiliary 1 and Auxiliary 2 SPDT
dry contact outputs. The auxiliary outputs are user
configurable using the user-interface controller and can
control various inputs or various conditions such as low
pressure, loss of pressure, bypass implemented, rapid
exchange valve on, enclosure above maximum pressure
setting, etc. Both enclosure contacts and auxiliary
contacts are forced-guided safety relays for functional
safety.
I/O Manual
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