Table 4-1 Cooling water specification
Water analysis Measured values
pH > 7.5 - 10
Conductivity < 600 µS/cm
Chloride (Cl
-
) < 150 mg/l
Manganese (Mn
2-)
< 0.05 mg/l
Fluoride (F) < 0.05 mg/l
Sulfate (SO
4
2-
) < 150 mg/l
Copper (CU
2+
) < 0.1 mg/l
Silicic acid < 25 mg/l
Free carbon dioxide Without
Total salts < 1000 mg/l
Nitrate level < 20 mg/l
Suspended matter < 10 mg/l
Permanganate consumption < 12 mg/l
Total hardness on German water hardness scale < 12
Carbonate hardness on German water hardness
scale
< 12
Ammonium content < 10 mg/l
Iron content < 0.2 mg/l
Note
Order-specific agreements
Observe any order-specific agreements regarding the cooling water specification. These might
deviate from the named cooling-water specification.
Note
Maintenance
The cooling system is maintenance-free provided cooling water of the specified quality is used.
4.5 Thermal motor protection
The machine is equipped with PTC thermistors for direct monitoring of the motor temperature
to protect the machine against overheating during operation. Plan a corresponding circuit for
monitoring.
See also
Set values for monitoring the winding temperature (Page 77)
Setpoint values for monitoring the bearing temperature (Page 77)
Preparations for use
4.5 Thermal motor protection
SIMOTICS TN Series N-compact 1LH8
26 Operating Instructions 06/2017
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