Carel Heos, User Manual

Page: 49 / 60

49
ENG
Heos +0300078EN - rel. 1.6 - 23.11.2017
8. SIGNALS AND ALARMS
Heos can manage both alarms relating to the status of the digital inputs
and to system operation. For each alarm, the following are controlled:
•
actions on the devices, if required
•
output relays
•
red LED on the terminal and buzzer
•
any activation delay
The complete list of alarms, with the related information as described
above, is available in the “Alarm table”.
8.1 Alarm management
All alarms feature the following behaviour:
•
When an alarm is activated, the red LED fl ashes and the buzzer and
alarm relay are activated (when confi gured)
•
Pressing the 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
and
•
Pressing the button again for at least 3 seconds manually resets
the alarms, which are cleared from the display unless others are active
(they are saved in the log)
Reset
Alarms can be reset manually or automatically:
•
Manual: the alarm is reset 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, the reset 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 button is pressed and held; the alarm is saved
in the log.
For manual reset, the functions associated with the alarm will not be
reactivated until the alarm is reset, while for automatic reset, the functions
are reactivated as soon as the alarm condition ceases.
Log
The alarm log can be accessed:
•
from branch F.d of the main menu
•
pressing and then when there are no active alarms
The alarm log screens show:
1.
the chronological number of the event (no. 01 is the oldest alarm)
2. time and date of the alarm
3.
the alarm code (see the table in par. 8.5)
4. short description of the logged alarm
5. control probe reading and set point, superheat reading and set
point, discharge temperature value, envelope zone, evaporation and
condensing pressure values converted to temperature.
The last screen displayed is used to reset the log.
Note : A maximum of 50 alarms can be logged; after this limit any
new events overwrite the oldest ones, which are therefore deleted.
Alarms history Fd01
rE 15:49 05/06/14
Regulation probe failure
Value Setpoint
Treg. : 05.0°C 04.0°C
SuperH. : 05.0°C 04.0°C
Tdisch. : 05.0°C
Temp. : HP05.0°C LP04.0°C
1
3
2
5
4
8.2 Compressor alarms
The compressor high and low pressure alarms can be set in branch
Dad01-04. In addition to the high and low pressure alarm thresholds, with
corresponding delays for the low pressure alarms, this screen can also be
used to set the type of reset when exiting the envelope. For the delay and
type of reset, also see the alarm table (par. 8.5).
8.3 EEV valve protector alarms
The alarms corresponding to the LowSH, LOP, MOP and High Tcond
protectors are only activated during control when the corresponding
activation threshold is exceeded, and only when the timeout defi ned by
the corresponding parameter has elapsed. If a protector is not enabled
(integration time= 0 s), no alarm will be signalled. If before the expiry
of the timeout, the protector control variable returns back inside the
corresponding threshold, no alarm will be signalled.
Note: this is a likely event, as during the timeout, the protection
function will have an eff ect.
If the timeout relating to the control alarms is set to 0 s, the alarm is
disabled. The protectors are still active, however. The alarms are reset
automatically.
8.4 Temperature alarms
Assign probe for high and low temperature alarms
(parameters Aa, Aa2)
Aa selects the probe to be used for measuring the high and low
temperature alarms with reference to thresholds AL and AH. Aa2 is the
same as Aa for thresholds AL2 e AH2.
Par Description Def Min Max UM
Aa Assign probe for high (AH) and low (AL) tempera-
ture alarm
0: VIRTUAL PROBE
1: OUTLET PROBE
2: DEFROST PROBE
3: INTAKE PROBE
4: SUCTION PROBE
5: SATURATED PROBE
7: AUX. PROBE 1
8: AUX. PROBE 2
9: DEWP. TEMP. PROBE 1 0 9 -
Aa2 Assign probe for high (AH2) and low (AL2) tempe-
rature alarm - see Aa 0 0 9 -
Tab. 8.a