TAM 00746
30
DSP1 045 - 100
11 / 2019
Three phase synchronous motor
English
9.6 Cooling water quality
The cooling water must meet the following requirements:
Conditions
Unit
Value
Maximum permissible system pressure
bar
6
Temperature of the coolant for the motor
°C
10 to 25
pH-value (at 20 °C)
---
6,5 to 9
Water hardness
mmol / l
1,43 to 2,5
Chlorid - Cl
mg / l
< 200
Sulfat - SO
4
²
mg / l
< 200
Oil
mg / l
< 1
Permissible particle size of solid foreign bodies,
particles (such as sand)
mm
< 0,1
Table 8: Cooling water quality
Water free of suspended matter and dirt must be used as coolant.
9.7 Minimum coolant temperature in dependance of the ambient conditions
25
% r
el. Feuc
hte
35
% r
el. Feuc
hte
45
% r
el
. Feuc
hte
55
% r
el
. Feuc
hte
65
% r
el
. Feuc
hte
75
% r
el
. Feuc
hte
85
% r
el
. Feuc
hte
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
Umgebungstemperatur (°C)
mi
n.
K
üh
lmi
tt
elt
empe
rat
ur
(°C)
Image 17: Determination of the coolant temperture
The permissible temperature of the coolant depends on the relative humidity during operation and
the ambient temperature. For example, a minimum coolant inlet temperature of 18 °C is permissible