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172 Internal cooling circuit
Condensation is not permitted. The minimum coolant temperature to avoid condensation
(at an atmospheric pressure of 1 bar) is shown below as a function of relative humidity (RH)
and ambient temperature (T
T
air
(°C)
RH = 95%
5
10
15
20
25
30
35
40
45
50
55
= Not permitted as standard but the coolant temperature must be 0 °C (32 °F) or more.
At an air temperature of 45 °C and relative humidity of 65% the coolant temperature must
Example:
Maximum temperature rise: Depends on heat losses and mass flow. Typically 10 °C (18
°F) with nominal losses and flow.
Pressure limits
￭
Base pressure: 250 kPa (recommended); 300 kPa (maximum). "Base pressure" denotes
the pressure of the system compared with the atmospheric pressure when the cooling circuit
is filled with coolant.
Air counterpressure in expansion vessel (with ACS880-1007LC cooling unit): 80 kPa
Design pressure (PS): 600 kPa
Nominal pressure difference: 120 kPa with Antifrogen® L 25% coolant solution, 140 kPa
with Antifrogen® L 50% coolant solution. This has to be taken into account when
dimensioning the liquid cooling circuit.
Maximum pressure difference: 160 kPa
Coolant flow rate limits
￭
The maximum coolant flow rate for all drive equipment is 1.3 × nominal. See the technical
data chapter for nominal values.
Cooling circuit materials
￭
Materials used in the internal cooling circuit are listed below.
).
air
RH = 80%
4.3
1.9
9.2
6.7
14.2
11.5
19.2
16.5
24.1
21.4
29.1
26.2
34.1
31.1
39.0
35.9
44.0
40.8
49.0
45.6
53.9
50.4
Min. T
(°C)
coolant
RH = 65%
-0.9
3.7
8.4
13.2
17.9
22.7
27.4
32.2
36.8
41.6
46.3
not be less than +36.8 °C
RH = 50%
RH = 40%
-4.5
-7.4
-0.1
-3.0
4.6
1.5
9.4
6.0
13.8
10.5
18.4
15.0
23.0
19.4
27.6
23.8
32.1
28.2
36.7
32.8
42.2
37.1
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