Internal cooling circuit
141
Specifications
Temperature limits
Ambient temperature: See chapter Technical data.
Minimum coolant inlet temperature: Condensation is not allowed. The minimum
coolant temperature to avoid condensation (at an atmospheric pressure of 1 bar) is
shown below as a function of the relative humidity (φ) and the ambient
temperature (T
air
).
Maximum coolant inlet temperature for the drive
Drive with the optional liquid cooling unit (+C140 or +C141):
• 38 °C when the drive output capacity is not derated
• 38 °C … 45 °C when the drive output capacity is derated by 1% per 1 °C
temperature increase.
Drive without the optional liquid cooling unit:
• 42 °C when the drive output capacity is not derated
• 42 °C … 48 °C when the drive output capacity is derated by 1% per 1 °C
temperature increase.
Maximum inlet temperature variation: ±4°C
Maximum temperature rise: 13 °C; 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.
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 or
above. Consult an ABB representative if operation below coolant
temperature 5 °C is required.
Example: At an air temperature of 45 °C and relative humidity of 65% the coolant
temperature may not be below +36.8 °C
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