Liquid-cooled units

The SINAMICS S120 liquid-cooled drive units are specifically designed to address the requirements relating to liquid cooling; they are characterized by their high power density and optimized footprint. Liquid cooling dissipates heat much more efficiently than air cooling systems. As a result, liquid-cooled units are much more compact than air-cooled units with the same power rating. Since the heat losses generated by the electronic components are almost completely dissipated by the liquid coolant, only very small cooling fans are required. This means that the devices are quiet in operation. Due to their compact dimensions and almost negligible cooling air requirement, liquid-cooled units are the preferred solution wherever installation space is restricted and/or the ambient operating conditions are rough.

Control cabinets with liquid cooling are easy to implement as sealed units with degrees of protection of IP55.

The product portfolio includes the following liquid-cooled SINAMICS S120 built-in units:

Power Modules
Basic Line Modules
Active Line Modules
Active Interface Modules
Motor Modules

The associated system components such as line reactors, motor reactors, dv/dt filters plus VPL and sine-wave filters are air-cooled. Active Interface Modules are available in air-cooled and liquid-cooled versions.

Highlights of the liquid-cooled units

Up to a 60 % smaller footprint than air-cooled drive converters
All main components such as power semiconductors, DC link capacitors and balancing resistors are cooled by the cooling circuit
Only a low flow rate is required
Uniform pressure drop of 0.7 bar
Automatic protective functions
Nickel-plated busbars
Low noise
Compatible with all components and functions and tools of the SINAMICS system family
The power rating can be extended by connecting units in parallel
No equipment fans

Cabinet units in liquid-cooled version

Liquid-cooled SINAMICS S120 drive units are also available as cabinet units, including cooling system. See section SINAMICS S120 Cabinet Modules → Liquid-cooled units.

Example of a drive line-up with SINAMICS S120 liquid-cooled units

Характеристика

Derating

Liquid-cooled SINAMICS S120 chassis format units are rated for an ambient temperature of 45 °C (113 °F) and installation altitudes up to 2000 m (6562 ft) above sea level. At ambient temperatures > 45 °C (113 °F), the output current must be reduced. Ambient temperatures above 50 °C (122 °F) are not permissible. At installation altitudes > 2000 m (6562 ft) above sea level, it must be taken into account that the air pressure, and therefore air density, decreases as the height increases. As a consequence, the cooling efficiency and the insulation capacity of the air also decrease.

Current derating as a function of the temperature of the cooling liquid¹⁾

Current derating as a function of ambient temperature¹⁾

¹⁾ The factors of the two curves must not be multiplied. The highest value in each case must be assumed for the purposes of calculation, so that the derating factor in the worst-case scenario is 0.9.

Permissible ambient temperature as a function of installation altitude

Voltage derating as a function of installation altitude

Current derating for Power Modules and Motor Modules in chassis format as a function of the pulse frequency

To reduce motor noise or to increase output frequency, the pulse frequency can be increased relative to the factory setting (1.25 kHz or 2 kHz). When the pulse frequency is increased, the derating factor of the output current must be taken into account. This derating factor must be applied to the currents specified in the technical specifications.

For additional information, please refer to the SINAMICS Low Voltage Engineering Manual.

The following tables list the rated output currents of the SINAMICS S120 Power Modules and Motor Modules with pulse frequency set in the factory as well as the current derating factors (permissible output currents referred to the rated output current) for higher pulse frequencies.

Derating factor of the output current as a function of the pulse frequency for units with a rated pulse frequency of 2 kHz

Power Module Motor Module	Type rating at 400 V	Output current at 2 kHz	Derating factor at pulse frequency
6SL3315-... 6SL3325-...	kW (hp)	A	2.5 kHz	4 kHz	5 kHz	7.5 kHz	8 kHz
380 ... 480 V 3 AC
1TE32-1AA3	110 (150)	210	95 %	82 %	74 %	54 %	50 %
1TE32-6AA3	132 (200)	260	95 %	83 %	74 %	54 %	50 %
1TE33-1AA3	160 (250)	310	97 %	88 %	78 %	54 %	50 %
1TE35-0AA3	250 (400)	490	94 %	78 %	71 %	53 %	50 %
1TE41-4AS3 ¹⁾	800 (1000)	1330	88 %	55 %	–	–	–

¹⁾ This Motor Module has been specifically designed for loads demanding a high dynamic performance. The derating factor k_IGBT and the derating characteristics can be ignored (see section “Duty cycles” in the SINAMICS Low Voltage Engineering Manual).

Derating factor of the output current as a function of the pulse frequency for units with a rated pulse frequency of 1.25 kHz

Motor Module	Type rating at 400 V or 690 V	Output current at 1.25 kHz	Derating factor at pulse frequency
6SL3325-...	kW (hp)	A	2 kHz	2.5 kHz	4 kHz	5 kHz	7.5 kHz
380 ... 480 V 3 AC
1TE36-1AA3	315 (500)	605	83 %	72 %	64 %	60 %	40 %
1TE37-5AA3	400 (600)	745	83 %	72 %	64 %	60 %	40 %
1TE38-4AA3	450 (700)	840	87 %	79 %	64 %	60 %	40 %
1TE41-0AA3	560 (800)	985	92 %	87 %	70 %	60 %	50 %
1TE41-2AA3	710 (1000)	1260	92 %	87 %	70 %	60 %	50 %
1TE41-4AA3	800 (1150)	1405	97 %	95 %	74 %	60 %	50 %
500 ... 690 V 3 AC
1TG31-0AA3	90 (75)	100	92 %	88 %	71 %	60 %	40 %
1TG31-5AA3	132 (150)	150	90 %	84 %	66 %	55 %	35 %
1TG32-2AA3	200 (200)	215	92 %	87 %	70 %	60 %	40 %
1TG33-3AA3	315 (300)	330	89 %	82 %	65 %	55 %	40 %
1TG34-7AA3	450 (450)	465	92 %	87 %	67 %	55 %	35 %
1TG35-8AA3	560 (600)	575	91 %	85 %	64 %	50 %	35 %
1TG37-4AA3	710 (700)	735	84 %	74 %	53 %	40 %	25 %
1TG38-0AA3 ²⁾	800 (800)	810	82 %	71 %	52 %	40 %	25 %
1TG38-1AA3	800 (800)	810	97 %	95 %	71 %	55 %	35 %
1TG41-0AA3	1000 (1000)	1025	91 %	86 %	64 %	50 %	30 %
1TG41-3AA3	1200 (1250)	1270	87 %	79 %	55 %	40 %	25 %
1TG41-6AA3	1500 (1500)	1560	87 %	79 %	55 %	40 %	25 %

²⁾ The Motor Module 6SL3325-1TG38-0AA3 is optimized for low overload; with an increased pulse frequency, the derating factor is higher than for the Motor Module 6SL3325-1TG38-1AA3.

The following tables list the maximum achievable output frequency as a function of the pulse frequency.

Maximum output frequencies achieved by increasing the pulse frequency in Vector mode

Pulse frequency	Max. achievable output frequency
1.25 kHz	100 Hz
2 kHz	160 Hz
2.5 kHz	200 Hz
4 kHz	320 Hz
5 kHz	400 Hz

Maximum output frequencies achieved by increasing the pulse frequency in Servo mode

Pulse frequency	Max. achievable output frequency
2 kHz	300 Hz
4 kHz	300/550 Hz ³⁾

³⁾ Higher frequencies on request.For further information seehttps://support.industry.siemens.com/cs/document/104020669

Pressure drop

Pressure drop for liquid-cooled built-in units in chassis format

The pressure drop characteristics are valid for water. If antifreeze is used, the characteristics typically shift to the left.

For further information, please refer to the SINAMICS Low Voltage Engineering Manual.

Overload capability

Liquid-cooled SINAMICS S120 units have an overload reserve, e.g. to handle breakaway torques. If larger surge loads occur, this must be taken into account in the configuration. For drives with overload requirements, the appropriate base load current must, therefore, be used as a basis for the required load.

The permissible overload levels are valid under the prerequisite that the drive units are operated with their base-load current before and after the overload condition based on a duty cycle duration of 300 s.

For temporary, periodic duty cycles with high variations of load within the duty cycle, the relevant sections of the SINAMICS Low Voltage Engineering Manual must be observed.

Power Modules and Motor Modules

The base-load current for a low overload I_L is the basis for a duty cycle of 110 % for 60 s or 150 % for 10 s.

Low overload

The base-load current I_H for a high overload is based on a duty cycle of 150 % for 60 s or 160 % for 10 s.

High overload

Line Modules

The base-load current for a high overload I_{H DC} is the basis for a duty cycle of 150 % for 60 s or I_{max DC} for 5 s.

High overload

Технические данные

General technical specifications

Unless clearly specified otherwise, the following technical data are valid for all the following components of the liquid-cooled SINAMICS S120 drive system in the chassis format.

Electrical specifications
Rated voltages	380 ... 480 V 3 AC ±10 % (-15 % <1 min) 500 ... 690 V 3 AC ±10 % (-15 % <1 min)
Line supply types	Grounded TN/TT systems and non-grounded IT systems
Line frequency	47 ... 63 Hz
Overvoltage category	III to EN 61800‑5‑1
Electronics power supply	24 V DC, -15 % +20 % implemented as PELV circuit in accordance with EN 61800-5-1 Ground = negative pole grounded via the electronics
Rated short-circuit current per IEC, in conjunction with the specified fuses or circuit breakers
1.1 ... 447 kW	65 kA
448 ... 671 kW	84 kA
672 ... 1193 kW	170 kA
> 1194 kW	200 kA
Rated short-circuit current SCCR (Short Circuit Current Rating) according to UL508C (up to 600 V), in conjunction with the specified fuses or circuit breakers
1.1 ... 447 kW	65 kA
448 ... 671 kW	84 kA
672 ... 1193 kW	170 kA
> 1194 kW	200 kA
Control method	Vector/Servo control with and without encoder or V/f control
Fixed speeds	15 fixed speeds plus 1 minimum speed, parameterizable (in the default setting, 3 fixed setpoints plus 1 minimum speed are selectable using terminal block/PROFIBUS/PROFINET)
Skippable speed ranges	4, parameterizable
Setpoint resolution	0.001 rpm digital (14 bits + sign) 12 bits analog
Braking operation	With Active Line Modules, four-quadrant operation as standard (energy recovery). With Basic Line Modules, two-quadrant operation as standard, braking by means of an optional braking chopper, or alternatively by a Motor Module.
Mechanical specifications
Degree of protection	IP00 (IP20, without taking into account the connecting busbars)
Protection class	I acc. to EN 61800‑5‑1
Touch protection	EN 50274/DGUV regulation 3 when used as intended
Cooling method	Liquid cooling with integrated heat exchanger in aluminum or stainless steel version
Ambient conditions	Storage ¹⁾	Transport ¹⁾	Operation
Ambient temperature (air)	-25 ... +55 °C (-13 ... +131 °F) Class 1K4 acc. to EN 60721‑3‑1	-25 ... +70 °C (-13 ... +158 °F) Class 2K4 acc. to EN 60721‑3‑2	Line-side components, Power Modules, Line Modules and Motor Modules: 0 ... 45 °C (32 ... 113 °F)without derating >45 ... 50 °C (113 ... 122 °F) see derating characteristics Control Units, supplementary system components, and Sensor Modules: 0 ... 55 °C (32 ... 131 °F) (for operation in a control cabinet) DC link components and motor-side components: 0 ... 55 °C (32 ... 131 °F)
Relative humidity Condensation, splashwater, and ice formation not permitted (EN 60204, Part 1)	5 ... 95 % Class 1K4 acc. to EN 60721‑3‑1	Max. 95 % at 40 °C (104 °F) Class 2K4 acc. to EN 60721‑3‑2	5 ... 95 % Class 3K3 acc. to EN 60721‑3‑3
Environmental class/harmful chemical substances	Class 1C2 acc. to EN 60721‑3‑1	Class 2C2 acc. to EN 60721‑3‑2	Class 3C2 acc. to EN 60721‑3‑3
Organic/biological influences	Class 1B1 acc. to EN 60721‑3‑1	Class 2B1 acc. to EN 60721‑3‑2	Class 3B1 acc. to EN 60721‑3‑3
Degree of pollution	2 acc. to IEC/EN 61800‑5‑1
Installation altitude	Up to 2000 m (6562 ft) above sea level without derating, > 2000 m (6562 ft) above sea level, refer to the derating data
Mechanical stability	Storage ¹⁾	Transport ¹⁾	Operation
Vibratory load		Class 2M2 acc. to EN 60721-3-2	Test values acc. to EN 60068‑2‑6 test Fc: 10 ... 58 Hz with constant deflection 0.075 mm 58 ... 150 Hz with constant acceleration 9.81 m/s² (1 × g)
Shock load		Class 2M2 acc. to EN 60721-3-2	Test values acc. to EN 60068‑2‑27 test Ea: 98 m/s² (10 × g)/20 ms
Compliance with standards
Certificates of suitability	CE (EMC Directive No. 2014/30/EU, Low Voltage Directive No. 2014/35/EU and Machinery Directive 2006/42/EC for functional safety) RCM cULus (only for devices connected to line supply voltages 380 ... 480 V 3 AC and 500 ... 600 V 3 AC)
Electromagnetic compatibility	Built-in units SINAMICS S120 chassis format can be operated in the second environment, Category C3/C2 according to EMC product standard EN 61800‑3. For further information, see section Tools and configuring.

¹⁾ In transport packaging.

Deviations from the specified class are underlined.

Cooling circuit and coolant quality

The following tables and sections describe the quality requirements of the coolant used in the liquid-cooled SINAMICS S120 drive system in chassis format.

Cooling circuit
System pressure with reference to atmospheric pressure, max.	600 kPa
Pressure drop at rated volumetric flow	70 kPa
Recommended pressure range	80 ... 200 kPa
Inlet temperature of liquid coolant	Dependent on ambient temperature, no condensation permitted 0 ... 45° C (32 ... 113 °F) without derating >45 … 50 °C (113 ... 122 °F), see derating data Anti-freeze essential for temperature range between 0 °C (32 °F) and 5 °C (41 °F)
Coolant quality
Coolant basis for aluminum heat sinks	Distilled, demineralized, completely desalinated water or deionized water with reduced electrical conductivity ISO 3696, quality 3 or based on IEC 60993
Electrical conductivity	<30 μS/cm (3 mS/m)
pH value	5 ... 8
Components that can be oxidized as oxygen content	< 30 mg/l
Residue after vaporization and drying at 110 °C	<10 mg/kg
Coolant basis for stainless steel heat sinks	Filtered drinking water
Electrical conductivity	<2000 μS/cm
pH value	6.5 ... 9
Chloride ions	<200 mg/l
Sulfate ions	<240 mg/l
Nitrate ions	< 50 mg/l
Total hardness	< 1.7 mmol/l
Dissolved substances	< 340 mg/l
Size of entrained particles	< 100 μm
	The coolant definition specified here should only be considered as recommendation. For units that have been shipped, the information and data provided in the equipment manual supplied should be observed!

Antifreeze and inhibitors

Antifreeze	Antifrogen N	Antifrogen L	DOWCAL 100
Manufacturer	Clariant	Clariant	DOW
Chemical base	Ethylene glycol	Propylene glycol	Ethylene glycol
Minimum concentration	20 %	25 %	20 %
Anti-freeze agent with minimum concentration	-10 °C	-10 °C	-10 °C
Maximum concentration	45 %	48 %	44 %
Anti-freeze agent with maximum concentration	-30 °C	-30 °C	-30 °C
Inhibitor content	Contains inhibitors with nitrites	Contains inhibitors that are free of nitrates, amines, borates and phosphates	Contains inhibitors that are free of nitrates, amines and phosphates
Biocide action with a concentration of	> 20 %	> 30 %	> 20 %

Biocides prevent corrosion that is caused by slime-forming, corrosive or iron-depositing bacteria. These can occur in closed cooling circuits with low water hardness and in open cooling circuits. Biocides must always be selected according to the relevant bacterial risks. Compatibility with inhibitors or antifreeze used with them must be checked on a case-by-case basis.

Inhibitors	Antifrogen N	ANTICORIT S 2000 A
Manufacturer	Clariant	Fuchs
Chemical base	Ethylene glycol	–
Minimum concentration	20 %	4 %
Maximum concentration	45 %	5 %

Recommended service

The manufacturer of the antifreeze/inhibitor should analyze the coolant at least once per annum. The concentration and boundary conditions of the antifreeze/inhibitor should be checked. It may be necessary to correct the concentration on the plant side.

Protection against condensation

With liquid-cooled units, warm air can condense on the cold surfaces of heat sinks, pipes and hoses. This condensation depends on the air humidity and the temperature difference between the ambient air and the coolant.

The water which is produced as a result of condensation can cause corrosion as well as electrical damage such as creepage shorts and flashovers. As the SINAMICS units cannot prevent condensation if it is caused by the prevailing climatic conditions, any potential risk of condensation must be prevented by appropriate engineering or by precautionary measures implemented by the customer. These measures include the following:

a fixed coolant temperature that has been adjusted to the expected air humidity or ambient temperature ensures that critical differences between the coolant and ambient air temperatures do not develop or
temperature regulation of the coolant as a function of the ambient air temperature

The temperature at which water vapor contained in the air condenses into water is known as the dew point. To prevent condensation reliably, the coolant temperature must always be higher than the dew point.

The table below specifies the dew point as a function of room temperature T and relative air humidity Φ for an atmospheric pressure of 100 kPa (1 bar). This corresponds to an installation altitude of 0 up to approximately 500 m (1640 ft) above sea level. Since the dew point drops as the air pressure decreases, the dew point values at higher installation altitudes are lower than the specified table values. It is therefore the safest approach to engineer the coolant temperature according to the values in the table for an installation altitude of zero.

Ambient temperature	Relative air humidity Φ
T	20 %	30 %	40 %	50 %	60 %	70 %	80 %	85 %	90 %	95 %	100 %
10 °C (50 °F)	<0 °C (32 °F)	<0 °C (32 °F)	<0 °C (32 °F)	0.2 °C (32.4 °F)	2.7 °C (36.9 °F)	4.8 °C (40.6 °F)	6.7 °C (44.1 °F)	7.6 °C (45.7 °F)	8.4 °C (47.1 °F)	9.2 °C (48.6 °F)	10 °C (50 °F)
20 °C (68 °F)	<0 °C (32 °F)	2 °C (35.6 °F)	6 °C (42.8 °F)	9.3 °C (48.7 °F)	12 °C (53.6 °F)	14.3 °C (57.7 °F)	16.4 °C (61.5 °F)	17.4 °C (63.3 °F)	18.3 °C (64.9 °F)	19.1 °C (66.4 °F)	20 °C (68 °F)
25 °C (77 °F)	0.6 °C (33.1 °F)	6.3 °C (43.3 °F)	10.5 °C (50.9 °F)	13.8 °C (56.8 °F)	16.7 °C (62.1 °F)	19.1 °C (66.4 °F)	21.2 °C (70.2 °F)	22.2 °C (72 °F)	23.2 °C (73.8 °F)	24.1 °C (75.4 °F)	24.9 °C (76.8 °F)
30 °C (86 °F)	4.7 °C (40.5 °F)	10.5 °C (50.9 °F)	14.9 °C (58.8 °F)	18.4 °C (65.1 °F)	21.3 °C (70.3 °F)	23.8 °C (74.8 °F)	26.1 °C (79 °F)	27.1 °C (80.8 °F)	28.1 °C (82.6 °F)	29 °C (84.2 °F)	29.9 °C (85.8 °F)
35 °C (95 °F)	8.7 °C (47.7 °F)	14.8 °C (58.6 °F)	19.3 °C (66.7 °F)	22.9 °C (73.2 °F)	26 °C (78.8 °F)	28.6 °C (83.5 °F)	30.9 °C (87.6 °F)	32 °C (89.6 °F)	33 °C (91.4 °F)	34 °C (93.2 °F)	34.9 °C (94.8 °F)
40 °C (104 °F)	12.8 °C (55 °F)	19.1 °C (66.4 °F)	23.7 °C (74.7 °F)	27.5 °C (81.5 °F)	30.6 °C (87.1 °F)	33.4 °C (92.1 °F)	35.8 °C (96.4 °F)	36.9 °C (98.4 °F)	37.9 °C (100.2 °F)	38.9 °C (102 °F)	39.9 °C (103.8 °F)
45 °C (113 °F)	16.8 °C (62.2 °F)	23.3 °C (73.9 °F)	28.2 °C (82.8 °F)	32 °C (89.6 °F)	35.3 °C (95.5 °F)	38.1 °C (101.6 °F)	40.6 °C (105.1 °F)	41.8 °C (107.2 °F)	42.9 °C (109.2 °F)	43.9 °C (111 °F)	44.9 °C (112.8 °F)
50 °C (122 °F)	20.8 °C (69.4 °F)	27.5 °C (81.5 °F)	32.6 °C (90.7 °F)	36.6 °C (97.9 °F)	40 °C (104 °F)	42.9 °C (109.2 °F)	45.5 °C (113.9 °F)	46.6 °C (115.9 °F)	47.8 °C (118 °F)	48.9 °C (120 °F)	49.9 °C (121.8 °F)

A detailed description of the cooling circuits and the recommended coolant is given in the SINAMICS Low Voltage Engineering Manual.