Technical data
Rittal Modular Safe LMS 9.3 Operation and functionality
We reserve the right to make technical changes Version 2.2
Operator Manual Page 46
Defining system messages for evaluation
System messages are shown on the display of the Comfort controller via the displays A1 to A20 and E0. A
more detailed explanation of the system messages may be found in section “Evaluating system messages”
on page 47.
See also diagram on page 45.
Progr.
level
Display
screen
Min.
value
Max.
value
Factory
setting
Type or location of fault
7 A1 0 2 0 Enclosure door open
8 A 2 0 2 0 Internal temperature of enclosure too high
9 A 3 0 2 0 Filter monitoring
10 A 4 0 2 0 Ambient temperature too high/too low
11 A 5 0 2 0 Icing hazard
12 A 6 0 2 1 PSA
H
pressure-operated switch
13 A 7 0 2 2 Evaporator coil
14 A 8 0 2 1 Condensate warning
15 A 9 0 2 1 Condenser fan blocked or defective
16 A 10 0 2 1 Evaporator fan blocked or defective
17 A 11 0 2 2 Compressor
18 A 12 0 2 1 Condenser
19 A 13 0 2 1 Ambient temperature sensor
20 A 14 0 2 1 Icing temperature sensor
21 A 15 0 2 1 Icing temperature sensor
22 A 16 0 2 1 Internal temperature sensor
23 A 17 0 2 1 Phase monitoring
24 A 18 0 2 0 EPROM
25 A 19 0 2 0 LAN/Master-Slave
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 normally open contact:
- see connection diagrams in the manufacturer’s instruction:
- Terminal 3: NC (normally closed)
- Terminal 4: C (connection of the supply voltage to the system message relay)
- Terminal 5: NO (normally opened)
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