ABB ACS880-77CC, Hardware Manual

Page: 121 / 128

Specifications
￭
Temperature limits
Ambient temperature: See the technical data.
Minimum coolant inlet temperature: Condensation or frost is not allowed. The minimum
coolant temperature to avoid condensation (at an atmospheric pressure of 1 bar / 100 kPa)
is shown below as a function of the relative humidity (RH) and the ambient temperature
(
T
air
). If coolant inlet temperature cannot be higher, the temperature values in the table
below are absolute minimums.
To avoid all kind of condensation inside the converter: ABB highly recommends to maintain
/ heat up the cooling 10 °C (+50 °F) above the ambient temperature (ie, air
temperature outside the converter), within the limits that the cooling liquid minimum
temperature is +5 °C (41 °F) and maximum temperature is +50 °C (122 °F). The table below
shows the minimum coolant inlet temperatures.
Min. T
coolant
(°C) T
air
(°C)
RH = 40% RH = 50% RH = 65% RH = 80% RH = 95%
-7.4 -4.5 -0.9 1.9 4.3 5
-3.0 -0.1 3.7 6.7 9.2 10
1.5 4.6 8.4 11.5 14.2 15
6.0 9.4 13.2 16.5 19.2 20
10.5 13.8 17.9 21.4 24.1 25
15.0 18.4 22.7 26.2 29.1 30
19.4 23.0 27.4 31.1 34.1 35
23.8 27.6 32.2 35.9 39.0 40
28.2 32.1 36.8 40.8 44.0 45
32.8 36.7 41.6 45.6 49.0 50
37.1 42.2 46.3 50.4 53.9 55
Not allowed as standard but the coolant temperature must be 5 °C (41 °F) or above. Consult
an ABB representative if operation below coolant temperature 5 °C (41 °F) is required.
At an air temperature of 45 °C (113 °F) and relative humidity of 65% the coolant temperature
may not be below +36.8 °C (98.2 °F).
Example:
Maximum coolant inlet temperature: 50 °C (122 °F) without derating of the converter
output capacity. Range above 50 °C (122 °F) is allowed as follows:
Converter output current derating Range
2.5% per 1 °C (1.8 °F) temperature increase 50…55 °C (122…131 °F)
Maximum temperature rise: 13 °C (55.4 °F); depends on mass flow.
Cooling and heating 121