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8. ALARMS
pRack PR100 can manage both alarms relating to the status of the digital
inputs and to operation of the system. For each alarm, the following are
controlled:
• The actions on the devices, if necessary
• The output relays (one global and two with different priorities, if
configured)
• The red LED on the terminal and the buzzer, where present
• The type of acknowledgement (automatic, manual, semiautomatic)
• Any activation delay
8.1.3
• by pressing the
(Alarm) button and then
(Enter) when there are
no active alarms
• by pressing
(Enter) after having scrolled all the alarms.
The alarm log screens show:
Order of activation (no. 01 is the oldest alarm)
Hour and date the alarm was activated
Short description
Main values recorded at the moment the alarm was activated (suction
pressure and condensing pressure)
Note: A maximum of 50 alarms can be logged; after this limit any
new events overwrite the oldest ones, which are therefore deleted.
1.
2.
3.
4.
The complete list of alarms, with the related information as described
above, is available in Appendix A.4.
8.1 Alarm management
All alarms feature the following behaviour:
• When an alarm is activated, the red LED flashes and the buzzer is
activated (where present); the output relays corresponding to the
global alarm and to any alarms with priority are activated (if configured)
8.2 Compressor alarms
The number of alarms for each compressor can be set during the
configuration phase using the Wizard or subsequently from branch C.a.e/
C.b.e of the main menu. The number of alarms is the same for all the
compressors on the same line.
• Pressing the
(Alarm) button, the red LED stays on steady, the buzzer
is muted and the alarm screen is shown
• If there is more than one active alarm, these can be scrolled using
(Up)
(Down). This condition is signalled by an arrow at the bottom
right of the screen
Alarms
• Pressing the
(Alarm) button again for at least 3 seconds
acknowledges the alarms manually, and these are cleared from the
display unless others are active (they are saved in the log)
8.1.1
Cae01
Number of alarms
for each compressor:
3
Priority
For certain alarms, the alarm output relay can be set with two types of
priority:
• R1: serious alarm
• R2: normal alarm
The corresponding relays, once configured, are activated when an alarm
with the corresponding priority occurs.
For the other alarms, the priority is fixed and is associated by default with
one of the two relays.
8.1.2
Log
The alarm log can be accessed:
• from branch G.a of the main menu
Fig. 8.a
Note: The maximum number of alarms that can be configured for
each compressor depends not only on the type of compressor, but
also on the size of pRack and the number of compressors fitted.
After having selected the number of alarms (maximum 4 for the
reciprocating or scroll compressors and 7 for screw compressors), the
settings can be configured for each alarm, choosing a description from
the options shown in the table, the output relay, the type of reset, delay
and priority. The effect of the alarm on the devices is set and involves
stopping the compressor, except for the oil warning.
Acknowledgement
The alarms can have
acknowledgement:
manual,
automatic
or
semiautomatic
• Manual: the alarm is acknowledged by pressing the
(Alarm)
button twice, the first time displays the corresponding alarm screen
and mutes the buzzer, the second (extended, for at least 3 seconds)
cancels the alarm (which is saved in the log). If the alarm is still active,
acknowledgement has no effect and the signal is shown again.
• Automatic: when the alarm condition ceases, the alarm is automatically
reset, the LED comes on steady and the corresponding screen remains
Possible descriptions for compressor alarms
Reciprocating or scroll
Generic
Overload
High pressure
Low pressure
Oil
displayed until the
(Alarm) button is pressed and held; the alarm is
saved in the log.
• Semiautomatic: acknowledgement is automatic, until a maximum
number of activations in set time. If the number reaches the maximum
set, acknowledgement becomes manual.
For manual acknowledgement, the functions associated with the alarm
are not reactivated until acknowledgement has been completed, while
for automatic acknowledgement they’re reactivated as soon as the alarm
condition ceases.
Screw
Generic
Overload
High pressure
Low pressure
Oil
Screw rotation
Oil warning (Filter Blocked)
Tab. 8.a
An example of a screen for selecting the description of the alarm is shown
in the figure:
Alarms
Cae02
Alarm 1 description:
Generic:
Overload:
High pressure:
Low pressure:
Oil:
Fig. 8.b
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pRack +0300011EN rel. 1.2 - 04.12.2012