9 Operation
EN
46
Rittal Liquid Cooling Package
9
Operation
9.1
Description of operating and display
components
9.1.1
Control unit hardware for the Liquid
Cooling Package
The control unit of the Liquid Cooling Package is a
CMC III processing unit. Its job is to poll the measure-
ments from the control unit of the fan modules, the
sensors on the heat exchanger, and from the control
unit of the water module via CAN bus, to perform con-
trol functions, and to transfer the setpoints (such as
the fan speed) to the individual units.
Fig. 51:
Liquid Cooling Package control unit (CMC III PU) –
front
Key
1
"C" button for acknowledging messages
2
Concealed reset button
3
Multi-LED for status display
4
SD card insert
5
Integral infrared access sensor
6
Mini USB connection for configuration
Fig. 52:
Liquid Cooling Package control unit (CMC III PU) –
rear
Key
7
Digital inputs (2 pieces)
8
USB master connection
9
Connection for display, GSM or ISDN unit module
RJ 12/RS 232
10
Ethernet interface RJ 45 with PoE
11
CAN bus connection (daisy chain) for CMC III sensors
12
Second CAN bus connection (for fan and water mod-
ule)
13
24 V DC power supply (power pack connection)
14
24 V DC power supply (direct connection)
15
Alarm relay output (floating contact, max. 24 V DC,
1 A).
The device consists of a compact plastic housing in
RAL 7035 with vented front in RAL 9005. The following
control and display components are set into the front
of the CMC III PU:
Tab. 5: CMC III PU operating and display components
An alarm relay may be connected via the floating
alarm relay output (fig. 52, item 15).
Please note the pin assignment of the connection
(see device labelling).
Configure the alarm relay after connecting (see as-
sembly and operating instructions of CMC III PU).
As well as the built-in sensors, a wide range of sen-
sors, actuators and access monitoring systems may
be connected via the CAN bus interface. A detailed
list of the entire range of accessories may be found on
the website given in section 20 "Customer service ad-
dresses".
9.2
Description of operation
9.2.1
General
The control unit of the LCP system carries out the fol-
lowing functions:
Note:
Only the second CAN bus connection
(fig. 52, item 12) may be used to connect the
fan and water modules.
Control and display
component
Explanation
"C" button
Use this button to confirm warnings and alarms.
Multi-LED for status
display (steady light)
Green:
All devices connected to the CAN bus have the status "OK".
Orange:
At least one device connected to the CAN bus has the status "Warning".
Red:
At least one device connected to the CAN bus has the status "Alarm".
Multi-LED for status
display (cyclical)
Green-orange-red:
At least one new device has been detected on the CAN bus (status "Detect-
ed").
Multi-LED for status
display (alternating)
Red-blue:
At least one device on the CAN bus has been removed or can no longer be accessed
via the CAN bus (status "Lost").
Multi-LED for status
display
Blue:
The position of at least one device on the CAN bus has been altered (status "Changed").
Red:
Update in progress (so-called heartbeat, alternating long and short).
