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Operating and Maintenance Instructions – 6 Installation – "Getting Started"
Rittal Liquid Cooling Package Plus
Tab. 11: Operating parameters for automatic mode
Fan control
mode
Pull-down menu for setting the calculation mode for automatic con-
trol of the fan speeds.
The required fan speed for automatic control is determined from
the difference of the server-out temperature and the setpoint for the
server-in temperature (dT = server-out temperature - server-in tem-
perature) and controlled linearly between speeds 1 and 4.
The following modes can be selected:
Fig. 61:
Setting options
- Average temperature:
In this mode, the average value of the server-out temperatures is
used to calculate the required fan speed.
- Maximum temperature:
In this mode, the highest value of the server-out temperatures is
used to calculate the required fan speed.
In addition, the automatic control of the fan speeds can be cont-
rolled using the values dT [min. fan speed] and dT [max. fan
speed].
dT [min.
fanspeed]
The fan operates at the lowest fan speed beneath this temperature
difference.
dT [max.
fanspeed]
The fan operates at the highest fan speed above this temperature
difference.
Sampling time
Setting of the control interval for the control valve. In this interval,
the actual temperature (average from the measurements of the
three fan modules/server-out temperature) is compared with the
setpoint (server-in temperature).
This is set in seconds [s] between 10 and 60 s (preset to 30 s).
PID
componenets
Values for setting the PID control algorithm integrated in the LCP
software. The following settings can be made here:
- P amount:
Parameter for setting the proportional amount. This is set as a per-
centage [%] between 0 and 30% (preset to 10%).
- I amount:
Parameter for setting the integral amount. This is set in seconds
[s] between 20 and 150 s (preset to 80 s).
- D amount:
Parameter for setting the differential amount. This is set in amount
per second [1/s] between 0 and 50/s (preset to 0/s).
Cw value
Specific thermal capacity of the cooling liquid used.
Setpoint by
display
Release options for the setpoint entry of the server-in temperature
using the graphical display (touchscreen) of the Liquid Cooling
Package Plus:
- Enable:
Setpoint entry is possible.
- Disable:
Setpoint entry is locked.
Displays
Explanation
Caution!
The preset values for the parameters "Sampling time" and "PID compo-
nents" are determined experimentally. Only change this values based
cases to enhance the type of control.
