11
B 242 - XTE 602 Eng. C1
22.11.10 AM
REV. 02
We reserve the right to make changes witout notice
COSTER
16. ALARMS
The alarms processed by the controller are of three types :
– alarms for the irregular operation of the controller and of the heating zones controlled
– alarms for short or open circuits detectors connected
– alarms by external contacts
The alarm status is indicated by the LEDs on the controller facia and is identified, on the configu-
ration page, by the letter “A” alternating with the number of the alarm concerned.
With C-Bus setup the alarms can be sent to a local PC and / or to the telemanagement central PC.
16.
1
Functional alarms
The functional alarms are triggered in the presence of prolonged differences between actual and
desired values.
These alarms, with the exception of the real time clock alarm (8), do not affect the normal operation
of the controller.
Factory setting : all disabled except for real time clock alarm (8)
Using + and – keys enable the alarms of interest replacing the dashes with the numbers.
When the number blinks = alarm triggered
The limit values and the delay times for sending the alarms can only be modified by PC.
Type of alarm and causes :
1
= temperature difference heating zone 1 flow (B1)
– enabled with pump M1 in operation
– triggered when actual temperature less than that desired.
3
= temperature difference ambient (B3)
– enabled with NORMAL modes and with outside temperature below desired ambient tempe-
rature.
– triggered when actual temperature below or above that desired.
5
= temperature difference heating zone 2 flow 2 (B5)
– enabled when pump M2 in operation
6
= temperature difference ambient (B6)
– enabled with NORMAL modes and with outside temperature below desired ambient tempe-
rature.
– triggered when actual temperature below or above that desired.
8
= internal real time clock : cannot be disabled
– triggered when clock assumes meaningless values.
16.
2
Detector alarms
The detector alarms are triggered in the event of
open
or
short
detector circuits.
Factory setting : all enabled.
With + and – keys disable the alarms which are not of interest by substituting dashes for the numbers.
Type of alarm and effect :
1
= flow 1 detector (B1) : valve Y1 stops where it is and pump M1 maintains its status at moment
of alarm.
2
= outside detector (B2) : valves stop where they are and pumps maintain their status at moment
of alarm. In C-Ring last value continues to be transmitted.
3
= ambient 1 detector (B3) : with pump M1 On, ambient temp. = desired ambient temp.; with
pump M1 Off, value of ambient temp. calculated by controller.
4
= anticondensing detector (B4) : anticondensing function disabled.
5
= flow 2 detector (B5) : valve Y2 stops where it is and pump M2 maintains its status at moment
of alarm.
6
= ambient 2 detector (B6) : with pump M2 On, ambient temp. = desired ambient temp.; with
pump M2 Off, value of ambient temp. calculated by controller.
8
= C-Ring : open electric circuit or fault in one of controllers in ring.
The triggering of the alarm is delayed by one minute .
16.
3
Alarms or status from external contacts (k)
Alarms triggered by closure of voltage-free contacts
k1
...
k3
regarding plant components (pumps,
burners, etc).
The triggering of the alarms is delayed by one minute.
Factory setting : all disabled.
With + and – keys enable alarms which are of interest by substituting numbers for dashes.
When number blinks = alarm triggered.
If not used as alarms they can be used as status indicators .
25.
5
F u n c t i o n a l A l a r m s
– – – – 8
25.
6
D e t e c t or A l a r m s
1 2 3 4 5 6 8
25.
7
K A l a r m s
– – – – –
