Note
Details on the design can be found in the layout diagram.
See also
Power cell (Page 37)
3.7 Re-cooling unit
3.7.1 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
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.
● The design of the re-cooling unit is part of the system integration.
● 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.
● Any failure of the re-cooling unit causes the immediate shutdown of the drive.
● Use two redundant circulating pumps. No interruption of the flow is permitted. The only
exception is a pump shutdown. The shutdown time must not exceed three seconds.
● Provide an overpressure valve in the raw water discharge of the heat exchanger. To keep
the temperature of the ionized water constant within specified limits and to prevent
condensation, on request, a control valve (tree-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.
● 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,
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.
● Provide a leakage-water monitoring for the raw water, e.g. by measuring the water level in
the expansion tank. The monitoring function must be tested during the routine test of the re-
cooling unit.
● Procure timely any consumables and spare parts from the supplier of the re-cooling unit.
Description
3.7 Re-cooling unit
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
34 Operating Instructions Rev.201910281231 EXAMPLE
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