Siemens SIMOTICS S-1FT7 User Manual

Mechanical properties
3.1 Cooling
S-1FT7 synchronous motors
46 Configuration Manual, 09/2018, A5E45099423B AA
Connecting motors in series
We can only recommend series connection of motors if:
● The required flow rates of the motors are approximately the same (< factor of 2)
● The maximum cooling water inlet temperature is maintained in the second or third motor.
Note
Derating of series-connected motors
The heat dissipation of the cooling water in the sec
ond and third motor may require derating
(see Table Derating factors).
3.1.3.3
Specification of the cooling water
Cooling water
Table 3- 9 Water specification as coolant
Quality of the water used as coolant for motors with alumi-
num, stainless steel tubes + cast iron or steel jacket
Chloride ions
< 40 ppm, can be achieved by adding deionized water.
Sulfate ions
< 50 ppm
Nitrate ions
< 50 ppm
pH value
6 ... 9 (with aluminum 6 ... 8)
Electrical conductivity
< 500 μS/cm
Total hardness
< 170 ppm
Dissolved solids
< 340 ppm
Size of entrained particles
< 100 μm
Corrosion protection
0.2 ... 0.25% inhibitor Nalco TRAC100 (previously 0GE056)
Anti-freeze protection
If necessary 20 ... 30% Antifrogen N (manufacturer Clariant)
Other coolants (not water-based)
If you use different cooling media (e.g. oil, cooling lubricant), derating may be necessary in
order to comply with the thermal motor limit.
Note
Derating when using other cooling lubricants
Derating is required
for water-oil mixtures with more than 10% oil.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English