User`s guide

4-32
Operation 4
High Pressure Safety File (File 12)
If the pressure goes above the high pressure limit,
the sequence of events is as follows:
• If the high pressure safety file (12) contains no
program, the pumps stop at the instant the pres-
sure rises above the limit. If the pressure drops
below the limit again, the pump will restart. This
cycle will continue indefinitely.
• If the high pressure safety file contains a pro-
gram, the pumps stop and wait for the pressure
to drop below the high pressure limit contained
in File 12. When the pressure is below this limit,
file 12 will begin to run. After file 12 is finished, if
there is a link to another file, this new file will
start to run. If there is another high pressure error
during file 12, the pump will stop until the pres-
sure drops below the limit and will then restart.
This cycle will continue indefinitely.
For an example of a High Pressure safety file, refer to
page 4-39, Program List 3.
Input # 2 Safety File (File 13)
When input # 2 is activated, it causes the following
sequence of events:
• If there is no program in File 13, activating input
# 2 will have no effect and the method program
will continue.
• If there is a program stored in File 13, when input
# 2 is activated, File 13 will start. File 13 will start
to run even if the system was not previously
running. If there is a link to another file at the end
of the program, the linked file will start to run.
Power Failure Safety File (File 14)
The power failure safety file will only operate if
there is a power failure while a method program is
running. The sequence of events after a power
failure is as follows:
• If there is no program stored in File 14: after the
power is restored, the program will go back to the
start of the method file and wait for a start input.
Programming the Safety Files