ABB ACS880-307LC, Hardware Manual

Page: 85 / 106

The higher the concentration of heat transfer fluid, the higher the viscosity of the coolant.
This results in a higher pressure loss in the system. See
Pressure limits (page 86) .
The nominal current ratings of drive system modules apply to an Antifrogen® L / water
solution of 25/75% (volume). With the Antifrogen® L concentration between 25% and 50%,
the drive output current must be derated by 1/3 percentage point per 1 p.p. increase in
Antifrogen® L concentration. The drawing below shows the derating factor
(k) in relation to
Antifrogen® L concentration.
1.00
0.95
25%
k
0.90
30% 35% 40% 45% 50%
Antifrogen® L concentration
Incoming coolant temperature:
• 0…40 °C (32…104 °F): no drive output current derating required
• 40…45 °C (104…113 °F): drive output current must be derated by 2 percentage points
per 1 °C (1.8 °F) temperature increase, as shown by curve (a).
• 45…50 °C (113…122 °F):
• If components with a maximum operating temperature of 55 °C (131 °F) are installed
in the same space as the drive modules, drive output current must be derated by
6 percentage points per 1 °C (1.8 °F) temperature increase, as shown by curve (c).
• If there are no components with a maximum operating temperature of 55 °C (131 °F)
installed in the same space as the drive modules, drive output current must be
derated by 2 percentage points per 1 °C (1.8 °F) temperature increase, as shown
by curve (b).
The drawing below shows the derating factor (k) in relation to coolant temperature.
T
1.00
0.90
+40 °C
+104 °F
k
0.80
0.70
0.60
+45 °C
+113 °F
+50 °C
+122 °F
(a)
(b)
(c)
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 relative humidity (RH)
and ambient temperature (
T
air
).
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
Internal cooling circuit 85