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Operating and Maintenance Instructions – 7 Hardware and software
Rittal Liquid Cooling Package Plus
7.2.3 Control unit for water module
(RLCP water)
7.3
Hardware
Fig. 68:
Control unit – water module (front)
1
Fuse (0.5 A)
2
Power supply (X10)
3
Power supply for condensate pump (X11)
Fig. 69:
Control unit – water module - rear
1
Socket for control cable (X18)
2
Socket for control valve (X19)
3
Status LED
4
Socket for temperature sensor of cooling water return (X13)
5
Socket for temperature sensor of cooling water flow (X12)
6
Socket for magnetic valve (optional)
7
Socket for flow sensor (X14)
8
Socket for leakage sensor (X16)
9
Socket for condensate sensor (X17)
The water unit also contains a control unit (RLCP water). The control voltage is
+24 V and is fed together with the I
2
C bus through connector X18 of the control
unit (RLCP water).
X18 pin assignment:
1
Address signal (TTL Level)
2
Gnd
3
N/C:
4
Gnd
5
Gnd
6
+ 24 V DC
7
I
2
C (Data)
8
I
2
C (Clock)
The control unit has two sockets (X12 and X13) for connecting two temperature
sensors. Both of these sensors are used to measure the flow and return water
temperature.
X12/X13 pin assignment:
1
NTC (5 V/max. 0.5 mA)
2
Gnd
Fuse max. 0. A
X10 AC in
X11 Cond.pump
2
3
1
I2C
X18
Motor
Valve
X19
Water
Out
X13
In
X12
Valve
X15
Flow
X14
Leak
X16
Cond.
X17
1
2
7
4
5
6
3
8
9
