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inlet temperature and/or an ambient temperature > +40°C, then you must reduce the torque.
Note the derating factors shown in the table below.
Table 4-1
Coolant inlet temperature up to
Ambient temperature up to
Derating factor k
Cooling volumetric flow and water pressure
Table 4-2
Type
1FW440.
1FW445.
1FW4503 / 1FW4505
1FW4507 / 1FW4508
1
Cooling water quality
The cooling water must meet the following prerequisites:
● Chemically neutral reaction
● Water cleaned by solids
● Max. particle size of particles carried: ≦ 0.1 mm
● No salt water
Table 4-3
Contents and chemical composition
pH value
Total hardness
Chloride
Sulphate
Nitrate
SIMOTICS HT Series HT-direct 1FW4...1......A
Operating Instructions 11/2018
Derating factors
T
Coolant flow rate and maximum permissible water pressure
Cooling volumetric flow
l/min
30
50
65
80
A maximum pressure drop of approximately 0.1 MPa occurs in the water jacket.
NOTICE
Damage due to sea water
The cooling system is made of St37 steel. This material is not resistant to sea water.
● Do not use seawater to cool the motor.
Chemical requirements of the cooling water quality
4.4 Cooling water inlet temperature (water-cooled motor)
25 °C
30 °C
40 °C
45 °C
1.0
0.97
Max. permissible water
pressure
1
MPa
0.5
0.5
0.5
0.5
Value
6.0 to 8.0
< 170 ppm
< 40 ppm
< 50 ppm
< 10 ppm
Preparations for use
35 °C
40 °C
45 °C
50 °C
55 °C
60 °C
0.95
0.92
0.89
Thread sizes for water
connections
G¾
G1
G1½
G1½
29
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