44 • MultiFlex I/O Board Operator’s Guide
Screens 4-19
The sixteen Input Setup screens are where
the input types for MultiFlex PAK inputs #1
through #16 must be defined. The input types are
listed and described in
8.4.1.6.
6 - Safety
Screen 1
The read-only field "HiDisch Pres" indicates
whether or not a safety shutdown due to high
discharge pressure is active ("YES" indicates an
active shutdown).
If HiDisch Pres is "YES," the safety shut-
down may be reset from this screen. Move the
cursor to the Reset All field and press POINT "."
or MINUS "-" to change the value of the field to
"YES."
Screen 2
Disch Trip.
The Discharge Trip setpoint is the
discharge pressure value that, if exceeded by the
Discharge Xducer input value, will cause a
safety shutdown of the refrigeration system.
Reset Diff.
When a safety shutdown due to dis-
charge trip occurs, the Reset Diff is the amount
the discharge pressure must fall below the Dis-
charge Trip setpoint before the PAK will auto-
matically reset the safety shutdown and resume
normal control. In other words, if the Discharge
Trip setpoint is 340 PSI and the Reset Diff is set
to 50, a safety shutdown will be reset when the
discharge pressure falls below 290 PSI (340 -
50).
An automatic reset will only occur if the
PAK has been in safety shutdown for an amount
of time equal to the Reset Delay.
Reset Delay.
The Reset Delay is the minimum
amount of time the PAK will remain in safety
shutdown after a discharge trip has occurred.
After the Reset Delay has elapsed, if the dis-
charge pressure lowers to below the Discharge
Trip Setpoint minus the Reset Diff, the safety
shutdown will be reset and the PAK will resume
normal control.
Resets PH.
The Resets Per Hour field specifies
the maximum number of automatic resets of a
safety shutdown that will be allowed within a
one-hour period. If a safety shutdown occurs and
the PAK has already auto-reset a number of
times equal to this parameter in the past hour, the
PAK will not attempt another auto-reset and will
remain in safety shutdown for the remainder of
the one-hour period or until the user manually
resets the PAK (see Screen 1 under the "Safety"
sub-menu).
Input Setup 1
Name: Suct Xdcr
Safety Shutdowns
HiDisch Pres NO
Reset All: NO
Disch Trip: 340
Reset Diff: 50
Reset Delay: 15M
Resets PH: 5
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