6 Operation
EN
18
Rittal enclosure cooling unit
Program system messages with the value
0:
System message is not sent to the system mes-
sage relay, but merely appears in the display
1:
System message is evaluated by relay 1
2:
System message is evaluated by relay 2
6.1.8
Setting the master/slave identifier
When several cooling units are connected together
(maximum ten), one of the cooling units must be defined
as the "master" and the others as "slaves". For this pur-
pose, assign a corresponding identifier (address) to
each cooling unit which will enable the cooling unit to be
identified in the network.
If one of the slave units reaches the set temperature or if
the door limit switch function is activated, the affected
slave unit will report to the master unit, which then deac-
tivates all the other cooling units.
On the
master cooling unit
(00 = factory setting), set
the number of slave units present in the network:
– 01: Master with 1 slave cooling unit
– 02: Master with 2 slave cooling units
– 03: Master with 3 slave cooling units
– 04: Master with 4 slave cooling units
– 05: Master with 5 slave cooling units
– 06: Master with 6 slave cooling units
– 07: Master with 7 slave cooling units
– 08: Master with 8 slave cooling units
– 09: Master with 9 slave cooling units
On the
slave cooling unit
(00 = factory setting), set its
own address:
– 11: Slave cooling unit no. 1
– 12: Slave cooling unit no. 2
– 13: Slave cooling unit no. 3
– 14: Slave cooling unit no. 4
– 15: Slave cooling unit no. 5
– 16: Slave cooling unit no. 6
– 17: Slave cooling unit no. 7
– 18: Slave cooling unit no. 8
– 19: Slave cooling unit no. 9
Fig. 20:
Master/slave connection (example)
For further connection examples, see section 4.6.1 "Bus
connection (only when interconnecting several units with
a Comfort controller)".
For details of how to set the identifier, see section 6.1.5
"Editable parameters" or section 6.1.6 "Programming
overview", parameter "Ad".
6.1.9
Evaluating system messages
In the e-Comfort controller, system messages are indi-
cated by a number in the display.
Following the appearance of messages A03, A06 and
A07 and after rectifying their cause, you will need to re-
set the e-Comfort controller (see section 6.1.10 "Reset-
ting the e-Comfort controller").
Notes:
– Only one unit may be configured as mas-
ter, and its identifier must match the num-
ber of connected slave units.
– The slave units must have different identi-
fiers.
– The identifiers must be numbered in as-
cending order without any gaps.
Master
02
Slave
11
Slave
12
Display
screen
System message
Possible cause
Measures to rectify the fault
A01
Enclosure door open
Door open or door limit switch incor-
rectly positioned
Close door, position door limit switch cor-
rectly, check connection if necessary
A02
Internal temperature of
enclosure too high
Cooling capacity inadequate/unit un-
dersized. Error as a consequence of
messages A03 to A17.
Check cooling capacity
A03
Filter monitoring
Filter mat soiled
Clean or replace;
reset the e-Comfort controller
A04
Ambient temperature
too high/low
Ambient temperature outside permis-
sible operating range (+10°C to
+60°C)
Raise or lower the ambient temperature
(e.g. heat or ventilate the room)
A05
Icing hazard
Operational display in case of icing
hazard.
Evaporator coil fan may be mechani-
cally blocked, defective, or cold air
outlet obstructed.
Set the enclosure interior temperature to a
higher value. Check the evaporator fan;
release or exchange if necessary.
Tab. 5:
Troubleshooting with the e-Comfort controller
Summary of Contents for Rittal 3273 Series
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