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6 Operation
6.2.6 Defining system messages for evaluation
System messages are shown on the display of the
GB
Comfort controller via the displays A1 to A20 and E0.
A more detailed explanation of the system messages
may be found in section "6.2.8 Evaluating system
messages", page 29.
See also Fig. 37 on page 27.
Progr.
Display
level
screen
7
A1
8
A2
9
A3
10
A4
11
A5
12
A6
13
A7
14
A8
15
A9
16
A10
17
A11
18
A12
19
A13
20
A14
21
A15
22
A16
23
A17
24
A18
25
A19
Tab. 5: System messages evaluable via relay
The system messages A1 – A19 may additionally be
evaluated via two floating system message relays.
In this way, one of the two system message relays
may be allocated to each system message.
System message relays with changeover and nor-
mally open contact: see connection diagrams under
"4.6.2 Installing the power supply", page 14:
– Terminal 3: NC (normally closed)
– Terminal 4: C (connection of the supply voltage to
the system message relay)
– Terminal 5: NO (normally opened)
28
Min.
Max.
Factory
Type or location of fault
value
value
setting
0
2
0
Enclosure door open
0
2
0
Internal temperature of enclosure too high
0
2
0
Filter monitoring
0
2
0
Ambient temperature too high/too low
0
2
0
Icing hazard
0
2
1
PSA
0
2
2
Evaporator coil
0
2
1
Condensate warning
0
2
1
Condenser fan blocked or defective
0
2
1
Evaporator fan blocked or defective
0
2
2
Compressor
0
2
1
Condenser
0
2
1
Ambient temperature sensor
0
2
1
Icing temperature sensor
0
2
1
Condensate warning temperature sensor
0
2
1
Internal temperature sensor
0
2
1
Phase monitoring
0
2
0
EPROM
0
2
0
LAN/Master-Slave
H
pressure-operated switch
The definitions NC and NO refer to the de-energised
state. As soon as power is applied to the cooling unit,
the system message relay picks up, so that the relay
contacts change status (contact 3 – 4 open; contact
4 – 5 closed). This is the normal operating state of the
cooling unit. As soon as a system message occurs or
the power supply is interrupted, the relay drops out.
Program system messages with the value
0:
System message is not sent to the system
message relay, but merely appears in the
display
1:
System messages is evaluated by relay 1
2:
System messages is evaluated by relay 2
Rittal cooling unit assembly instructions
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