Control Of The Cooling Unit - Siemens SINAMICS S120 Operating Instructions Manual

Commissioning
6.2 Commissioning the cooling unit
4. Switch a pump into manual operation. The water-air mixture is circulated. The air can
accumulate at the highest points. If coolant is still not pumped when the pumps are first
switched on, too much air is still present in the system. You vent the cooling unit as
described in Chapter "Venting the cooling circuit (Page 96)".
5. When the pumps operate, monitor the pressure manometer at the expansion vessel on the
suction side of the pumps. The supply pressure increases once the pump feeds coolant.
Although the return pressure decreases, it should not fall below 0.5 bar. To do this, monitor
the pressure manometer at the expansion vessel. If the return pressure falls below 0.5 bar
then there is insufficient coolant in the system. Add coolant as described in Chapter "Filling
the cooling circuit (Page 95)".
6. Monitor the intake and return pump pressure at the operator panel of the cooling unit. The
pump intake pressure should not exceed 5 bar. The integrated pressure relief valve
responds at 6 bar.
7. After running the pump briefly, vent again as described in Chapter "Venting the cooling
circuit (Page 96)"
8. The three-way valve in the idle state is at position "0". The cooling water is fed past the
heat exchanger and air remains in the heat exchanger. When pumping, set the three-way
valve to the "1" position. The heat exchanger fills with coolant. and displaces the air.
6.2.4

Control of the cooling unit

To operate the cooling unit automatically, communication with a higher-level controller is
necessary. The Siemens Logo control of the cooling unit communicates with the converter via
DRIVE-CLiQ. To realize this, there must be a DRIVE-CLiQ connection between the CU320
Control Unit of the converter and terminal TM31 of the cooling unit.
The converter communicates using the commands and feedback signals of the cooling unit
described in the following.
The following figure illustrates the communication between the controller of the cooling unit
and the converter:
100
NOTICE
Damage to the pumps
The pumps can be damaged if they run dry.
Make sure that the pumps do not run dry.
Applications for Cabinet Modules, liquid cooled
Operating Instructions, 04/2015, A5E35974555A