ABB ACS880-87LC-4000A/4021A-7, Hardware Manual

Page: 136 / 144

136 Cooling and heating
Specifications

Temperature limits
Ambient temperature: See chapter Technical data on page 107 .
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 (
φ
) and the ambient
temperature ( T
air
). 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).
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:
Maximum temperature rise: 13 °C (55.4 °F); depends on mass flow.

Pressure limits
Base pressure: 100…150 kPa (recommended); 200 kPa (maximum). Base pressure
denotes the pressure of the system compared with the atmospheric pressure when the
cooling circuit is filled with coolant.
Maximum design pressure: 500 kPa
Recommended design maximum pressure: 380 kPa. Note: Contact ABB if you need to
rise the pressure over this limit. The pressure difference must be within given limits to
avoid malfunction due to excessive coolant flow.
T
air
(°C)
Min. T
coolant
(°C)
φ
= 95%
φ
= 80%
φ
= 65%
φ
= 50%
φ
= 40%
5 4.3 1.9 -0.9 -4.5 -7.4
10 9.2 6.7 3.7 -0.1 -3.0
15 14.2 11.5 8.4 4.6 1.5
20 19.2 16.5 13.2 9.4 6.0
25 24.1 21.4 17.9 13.8 10.5
30 29.1 26.2 22.7 18.4 15.0
35 34.1 31.1 27.4 23.0 19.4
40 39.0 35.9 32.2 27.6 23.8
45 44.0 40.8 36.8 32.1 28.2
50 49.0 45.6 41.6 36.7 32.8
55 53.9 50.4 46.3 42.2 37.1
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.
Example: 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).
Range Converter output current derating
50 … 55 °C
(122 …131 °F)
2.5% per 1 °C (1.8 °F) temperature increase