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Description
3.5 Description of the components
3.5.13
Re-cooling unit
3.5.13.1
Re-cooling unit requirements
The re-cooling unit must comply with the following requirements:
● The raw water to be supplied by the plant flows through the heat exchanger that cools the
● The design of the re-cooling unit is part of the system integration. This involves, in particular,
● In the variant as water-air re-cooling unit, the heat loss is dissipated to the ambient air using
● Any failure of the re-cooling unit causes the immediate shutdown of the drive. Take this into
● Use 2 redundant circulating pumps. No interruption of the flow is permitted. The only
● Provide an overpressure valve in the raw water discharge of the heat exchanger. To keep
● Acquire the temperature of the raw water with a sensor and evaluate the data.
● To reduce the raw water consumption, the flow quantity can be reduced. A reduction,
● Procure timely any consumables and spare parts from the supplier of the re-cooling unit.
3.5.13.2
Operating principle of the re-cooling unit
The re-cooling unit dissipates the heat loss from the drive. The deionized water in the internal
water circuit absorbs the heat of the drive power unit which is to be dissipated. A maintenance-
free circulating pump pumps the hot water into the heat exchanger. The external raw water
circuit cools the hot deionized water. The cooled deionized water is pumped back to the drive.
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deionized water. To limit the volume of the deionized water, a re-cooling unit with a dual-
circuit system is required. Limit the deionized water circuit to the re-cooling unit and the
drive.
deviations from the required environmental conditions, such as aggressive cooling water.
Use heat exchanger plates made of titanium for aggressive cooling water, such as sea
water or high chloride content. If necessary, also consider an increased corrosion for the
design.
a separate installed heat exchanger. If you expect air temperatures below 0° C, you must
install a water-glycol intermediate circuit. Glycol is not permitted in the ionized-water circuit.
The measuring units and the control of the electrical equipment are evaluated in the re-
cooling unit. The supplier calibrates the measuring units in accordance with the order
specifications.
account in the engineering if the re-cooling unit is provided by the system integrator.
exception is a pump shutdown. The switchover time must not exceed 3 seconds.
the temperature of the ionized water constant within the specified limits and to prevent
condensation, on request, a control valve (three-way valve) can be installed as bypass.
Because the valve is controlled depending on the temperature of the deionized water, up to
approx. 100% of the raw water can be conveyed past the heat exchanger.
however, is possible only when the raw water does not contain any suspended matter that
could accumulate in the heat exchanger for a slower flow speed.
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE
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