Operating instructions

Vector Control Chassis Type Frequency Converter Technical Data
SIEMENS AG 476 869 4070 76 J AB-74
SIMOVERT MASTERDRIVES Operating Instructions 4-13
4.1 Notes on water-cooled units
The cooling system function is ensured by connecting the unit to an
external cooling-water circuit.
This cooling-water circuit configuration with the aspects
♦
open or closed circuit
♦
material selection and material pairing
♦
composition of the cooling water
♦
cooling of the cooling water (re-cooling, fresh supply...)
♦
etc.
are essential features for the operational safety and service life of the
entire equipment.
Water which has a chemically neutral reaction is pure and clean of solid
matter (in connection with the motor cooling water).
Max. grain size of any conveyed particles < 0.1 mm
pH value 6.0 to 8.0
Chloride < 40 ppm
Sulphate < 50 ppm
Dissolved substances < 340 ppm
Total hardness < 170 ppm
Cooling water inlet temperature + 5 ... 38 °C
Cooling water warming per unit
∆ T ≈ 5 °C
Operating pressure max. 1 bar
Higher operating pressures are not permitted!
If the unit is to be operated at a higher pressure, a reduction to 1 bar
admission pressure has to be made on each unit.
The material is not seawater-proof, i.e. direct cooling with seawater
is not permitted!
Filters (strainers) with a particle size < 100 µm must be used in the
unit's cooling water circuit!
If there is a danger of frost, frost-protection measures for operation,
storage and transport are necessary, e.g. emptying and blowing out
with air, additional heating, etc.
The warnings of the "standard units" are applicable.
Installation and service work on water sections may only be performed
when the unit is disconnected from the supply.
Cooling system
Cooling water
definition
CAUTION
WARNING