TAM 00682
28
DSC 045-100
07 / 2012
Three-phase synchronous motor
English
9.6
Coolant consistency
The coolant must satisfy the following specifications:
Conditions Unit
Value
Maximum permissible systempressure
bar
6
Temperature of coolant- for motor
°C
10 to 25
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
Table 8: Coolant consistency
Clean water that is free of dirt and suspended matter must be used as a coolant.
9.7
Min. coolant temperature against ambient temperature and humidity
25
%
rel
. h
um
idi
ty
35
%
rel
. h
um
idi
ty
45
%
rel
. h
um
idi
ty
55
%
re
l. h
um
idi
ty
65
%
rel
. h
um
idi
ty
75
%
re
l. h
um
idi
ty
85
%
re
l. h
um
idi
ty
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
ambient temperature (°C)
m
in. coo
lan
t t
em
p
er
at
ur
e (
°C
)
Figure 12: Determination of the coolant temperature
The allowed coolant temperature depends on relative humidity and ambient temperature. For
example with an ambient temperature of 25 °C and a relative humidity of 65 % the minimum
coolant temperature is 18 °C. Because these are limiting values on practical side a coolant
temperature greater than 18 °C should be used.
If this minimum coolant temperature will be under run the two- point controller of Baumüller drive
must be used to avoid condensation (see
figure 13
on next page).