8 Appendix 2: water-cooling
8.1 Coolantconsistency
The coolant must satisfy the following specifications:
Conditions Unit Value
Maximum permissible system pressure bar 6
Temperature of coolant- for motor °C 10 to 35
pH value (at 20 °C) --- 6.5 to 9
Overall hardness mmol / l 1.43 to 2.5
Chloride - Cl- mg / l < 200
Sulfate - SO
4
²- mg / l < 200
Oil mg / l < 1
Permissible particle size of solid foreign objects,
particles (e.g., sand)
mm < 0.1
Clean water that is free of dirt and suspended matter must be used as a coolant.
Note:
For standstill of motor for longer time the cooling must be stopped (to avoid condensation).
If ambient temperatures of < 3° C may occur during a longer motor standstill, coolant should be
discharged as a precaution (to prevent frost damage).
8.2 required coolant volume flows
The following amounts of coolant are necessary to cool the motors
DA size 100 132 160 180 225 280
Flow rate in l/min
(min.)
7
(5)
9
(6,5)
11
(9)
12
(10)
13
(11)
17
(14,5)
Pressure drop
in bar
0,29±10% 0,33±10% 1,05±10% 1,35±10% 2,55±10%
2,55±10
%
Temperature rise
in K
(max.)
6
(9)
7
(10)
8
(10)
10
(12)
11
(13)
11
(13)
Max. coolant
pressure in bar
5 5 5 5 5 6
TAM 00612 24
DA 100 – 280 W 06 / 2011
Three-phase synchronous motor water-cooled English
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