A+B Power Supply Change Over (Option); A/B Cooling Water Supply (Option); Shut Down Server Cabinet Power Supply (Option) - Knurr CoolTherm Bedienungsanleitung

CoolTherm
Manual / Bedienungsanleitung
figure quick coupling
6.4

A+B power supply change over (option)

The A+B change over circuit offers the possibility to supply the CoolTherms control equipment
from two independent mains supplies.
There are two cables to connect the CoolTherm to the external mains. These cables are
connected to the cabinets internal circuit by the terminal X1 ( X1:1 = phase, X1:2 = neutral , X1:3 =
PE for mains A and X1:4 = phase, X1:5 = neutral , X1:6 = PE for mains B ).
Please pay attention to the recommended external fuse ( take information from attached circuit
diagram page 1 ) !
The change over circuit itself consists of the contactors Q11 to Q14. Q11 is an auxiliary contactor
an presets the circuit to supply from mains A ( if the both mains supplies are powered up ).
Only in the case at mains A power is off the circuit switches automatically to mains B.
When powering up mains A again the circuit switches automatically back to mains A.
The main contactors Q12 and Q13 are mechanical and electrical coupled by part Q14, which
ensures that only one of the main contactors is closed. The phase and the neutral wires are
switched. All internal equipment is connected at the output of the A+B change over circuit. That
means fans, fan control unit or RMS have a redundant supply
6.5

A/B cooling water supply (option)

Redundant cooling water supply for connection to two independent cooling water supplies with
flow 2 x 1" AG and return 2 x 1" AG, cooling water connections at the front door, cooling water
flows, separated hydraulically, i.e. no connection of the two supplies, in the case of failure of
one cooling water supply, the second supply will reach cooling operation of up to 70% of the
nominal capacity, three-way valve corpus for cooling capacity adjustment at each of the two
supplies (A/B) pre-installed.
6.6

Shut down server cabinet power supply (option)

It is possible to shut down the primary power supply via over temperature signal of the control
board. This shut down is effected by power switches at the power supply input. Reset is possible
by using the reset keys.
The necessary configuration can be found in the attached wiring scheme.
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