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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
limits (page
116).
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.
k
1.00
0.95
0.90
25%
30%
35%
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.
k
1.00
(a)
0.90
0.80
0.70
0.60
+40 °C
+45 °C
+104 °F
+113 °F
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
40%
45%
50% Antifrogen® L concentration
(b)
(c)
+50 °C
T
+122 °F
Internal cooling circuit 115
Pressure
).
air
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