Alarm Management; Compressor Alarms; Priority; Acknowledgement - Carel PRK300L3FK User Manual

pRack pR300 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 diff erent priorities, if
confi gured)
•
The red LED on the terminal and the buzzer, where present
•
The type of acknowledgement (automatic, manual, semiautomatic)
•
Any activation delay
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 fl ashes and the buzzer is
activated (where present); the output relays corresponding to the
global alarm and to any alarms with priority are activated (if confi gured)
•
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
•
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

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 confi gured, are activated when an alarm
with the corresponding priority occurs.
For the other alarms, the priority is fi xed and is associated by default with
one of the two relays.
8.1.2

Acknowledgement

The alarms can have manual,
acknowledgement:
•
Manual: the alarm is acknowledged by pressing the
button twice, the fi rst 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 eff ect 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
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.
8. ALARMS
automatic or semiautomatic
(Alarm)
8.1.3 Log
The alarm log can be accessed:
•
from branch G.a of the main menu
•
by pressing the (Alarm) button and then
no active alarms
•
by pressing (Enter) after having scrolled all the alarms.
The alarm log screens show:
1. Order of activation (no. 01 is the oldest alarm)
2. Hour and date the alarm was activated
3.
Short description
4.
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.

8.2 Compressor alarms

The number of alarms for each compressor can be set during the
confi guration 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.
Alarms
Number of alarms
for each compressor:
Note: The maximum number of alarms that can be confi gured for
each compressor depends not only on the type of compressor, but
also on the size of pRack and the number of compressors fi tted.
After having selected the number of alarms (maximum 4 for the
reciprocating or scroll compressors and 7 for screw compressors), the
settings can be confi gured for each alarm, choosing a description from
the options shown in the table, the output relay, the type of reset, delay
and priority. The eff ect of the alarm on the devices is set and involves
stopping the compressor, except for the oil warning.
Possible descriptions for compressor alarms
Reciprocating or scroll
Generic
Overload
High pressure
Low pressure
Oil
An example of a screen for selecting the description of the alarm is shown
in the fi gure:
Alarms
Alarm 1 description:
Generic:
Overload:
High pressure:
Low pressure:
Oil:
75
ENG
(Enter) when there are
Cae01
3
Screw
Generic
Overload
High pressure
Low pressure
Oil
Screw rotation
Oil warning (Filter Blocked)
Tab. 8.a
Cae02
pRack +0300025EN rel. 1.3 - 17.12.2015