ABB ACS880-37LC-0390A-7, Hardware Manual, Page: 171 / 242

Freeze protection: The freezing point of the coolant is determined by the concentration of
heat transfer fluid in the mixture.
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 172) .
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)
1-phase (NBRW-669) brake modules (D150): 0…50 °C (32…122 °F): no current
derating required
Internal cooling circuit 171