Required Plant-Side Raw Water Circuit; Derating Data Of Liquid-Cooled S120 Cabinet Modules - Siemens SINAMICS G130 Engineering Manual

Example:
The maximum predicted ambient temperature T
installation of the liquid-cooled S120 Cabinet Modules are 40 °C and 80 % respectively. The relevant dew point
according to the table is therefore 35.8 °C. Applying a safety margin of around 4 °C, the correct setpoint for the
coolant temperature in the inflow line of the deionized water circuit is thus 40 °C.
7.3.4.3

Required plant-side raw water circuit

The use of a rugged, corrosion-resistant, stainless-steel plate heat exchanger in the Heat Exchanger Module, which
separates the plant-side raw water from the converter-side deionized water, means that the raw water does not have
to fulfill high quality standards.
The water in the raw water circuit must comply with the values specified below (based on VDI 3803). Alternatively,
the raw water circuit can be filled with a water/anti-freeze mixture (water must comply with the values specified below
based on VDI 3803 and the anti-freeze with the values specified for the deionized water circuit). The water must not
contain any substances that are corrosive or cause limescale deposits.
·
pH value
·
Chloride ions
·
Sulfate ions
·
Orthophosphate
·
Dissolved iron
·
Dissolved copper
·
Biological pollutants
·
SiO2 as silicic acid
·
Aluminum
·
Fluoride
·
Electrical conductivity
·
Total hardness
·
Size of entrained particles
·
Acid capacity 4.3 (upper limit for phosphate polymers
·
Permissible limit value for suspended particles
7.3.4.4

Derating data of liquid-cooled S120 Cabinet Modules

The liquid-cooled SINAMICS S120 Cabinet Modules are based on the liquid-cooled SINAMICS S120 built-in units in
Chassis format and on air-cooled system components such as fuses, switch disconnectors, circuit breakers, reactors
and filters.
Permissible output current and maximum output frequency as a function of pulse frequency
This information can be found in section "Rated data, permissible output currents, maximum output frequencies" of
chapter "General Information about Built-in and Cabinet Units SINAMICS S120".
Permissible current as a function of the coolant temperature in the deionized water circuit and the ambient
temperature
The liquid-cooled S120 Cabinet Modules and associated system components are rated for a coolant temperature in
the inflow line of the deionized water circuit of 45 °C (for degrees of protection < IP55) or of 40 °C (for degree of
protection IP55), and for an ambient temperature of 45 °C for an installation altitude of up to 2000 m above sea level.
Current derating must be applied if liquid-cooled SINAMICS S120 Cabinet Modules are operated at higher coolant
temperatures in the inflow line of the deionized water circuit and/or higher ambient temperatures. It is not permissible
to operate liquid-cooled S120 Cabinet Modules at coolant temperatures in excess of 50 °C in the inflow line of the
deionized water circuit (with degrees of protection < IP55) or > 45 °C (with degree of protection IP55) and at ambient
temperatures in excess of 50 °C. The following charts indicate the permissible current as a function of the coolant
temperature in the inflow line of the deionized water circuit and the ambient temperature.
SINAMICS S120 Cabinet Modules
and the maximum predicted relative air humidity Φ
max
for untreated top-up water)
SINAMICS Engineering Manual – November 2015
Engineering Information
at the site of
max
7.5 to 9.0
< 180 mg/l
< 200 mg/l
< 50 mg/l
< 3.0 mg/l
< 0.2 mg/l
< 50 KBE/ml
< 47 mg/l
< 2.65 mg/l
< 4.0 mg/l
< 2200 mS/cm
< 20 °dH (T < 40°C)
< 0.5 mm
< 10 mmol/l
Solid particles must not be
deposited at flow rates
of ≥ 0.5 m/s
Ó Siemens AG
457/528