Description, technical data
2.9 Cooling
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
35
NOTICE
Preventing condensation water
When the motor lies idle for long periods, shutdown the cooling circuit. Switch on the anti-
condensation heating if available.
The motors are designed in accordance with EN 60034-1 for operation up to a coolant
temperature of 25°C, assuming compliance with all motor data. If you operate a 1FW4 motor
with a higher coolant supply temperature and/or an ambient temperature > +40°C, you must
reduce the torque. Note the derating factors shown in the table below.
Table 2-7 Derating factors depending on the coolant supply temperature and the ambient
temperature
Coolant supply temperature to 25°C 30°C 35°C 40°C 45°C
Ambient temperature up to 40°C 45°C 50°C 55°C 60°C
Derating factor k
T
1.0 0.97 0.95 0.92 0.89
Cooling volumetric flow and water pressure
Table 2-8 Cooling volumetric flow and maximum permissible water pressure per shaft height
Shaft height Cooling volumetric flow Maximum permissible
water pressure
1)
Thread sizes for water
connections
40 30 l/min 5 bar G¾
45 50 l/min 5 bar G1
503, 505 65 l/min 5 bar G1½
507, 508 80 l/min 5 bar G1½
1) Pressure drop: max. approx. 0.1 MPa (1 bar) - The pressure drop stops on its own.
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 2-9 Chemical requirements of the water quality
Contents and chemical composition Value
pH value 6.0 to 8.0 pH
Total hardness < 170 ppm
Chloride < 40 ppm
Sulphate < 50 ppm
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