14
• Use the specific control in the command menu to reset a programmed alarm with memory.
• See settings menu M21 for alarm definition.
2.11
PLC logic (PLCx)
•
Xpress
can be set using a
ladder
program for creating a PLC internal logic inside the ref. 422684 422684, so as to be able
to freely create any function necessary for genset accessory applications.
• In the program logic, all the variables managed internally by the ref. 422684 can be entered, such as inputs (INPx), th-
reshold limits (LIMx), remote variables (REMx), controller states (RALx) etc.
• The processing results of the various branches of the ladder logic are stored in internal variables (PLCx), which may later
be used to control the 422684 outputs, or as support memories to built a more complex logic or to control the alarms
defined by the user (UAx).
• It is additionally possible to create timers inside the PLC program using the programmable timers of the M17 menu.
• The operation of the logic created with the ladder program may be checked in real time and possible corrected by me-
ans of the specific ACU configurator software.
2.12
Timers (TIMx)
• The system includes 8 timer variables, named TIM1..TIM8.
• These variables may be used either in the PLC ladder logic or in combination with the OUTn outputs or in combination
with UAn user alarms.
• Each timer variable has an input which controls it (e.g. a LIMn limit or an INPn inputs etc.). The state of this variable
changes from false to true (ramp up) and the timing variable also changes from false to true but only remains true for
the specified time and then returns false.
• Whenever the input variable becomes false, the TIMn variable also becomes false (this also occurs before the end of the
programmed time) and the time counter is reset to zero.
2.13
Automatic test
• The automatic test is a periodical test which is run at fixed deadlines (freuency programmed during setup) if the system
is in AUT mode and the function is enabled. The test consists in starting the gensets to check their efficiency.
• It is possible to decide which days of the week and what time of the day (hours-minutes) to run the test.
• See menu
M11 Automatic Test
for more information on programming.
• If there are multiple gensets in the system, only one is started for each automatic test. The others will be started in
seuence the next time.
• After starting, the genset works for a programmable time after which it stops. The message
T.AUT
appears on the display
before starting.
• The test can be enabled or disabled for each single genset using the parameters of menu M11 and on the Automatic Test
display page without needing to open the setup menu.
- On the Automatic Test page, press
◄
and
►
at the same time.
- Select the reuired genset by pressing
▲
and
▼
. Enable the test with
►
and disable it with
◄
.
-
✓
Save and exit the setting.
2. Operating modes