ABB ACS880-204LC, Руководство по оборудованию

Страница: 177 / 278

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 178) .
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.
Internal cooling circuit 131
The drawing below shows the derating factor ( k ) in relation to coolant 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 relative humidity (f) and
ambient temperature (
T
air
).
Maximum temperature rise: Depends on heat losses and mass flow. Typically 5 °C
(9 °F) with nominal losses and 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.
Air counterpressure in the expansion tank: 40 kPa
Design pressure: 600 kPa
Nominal pressure difference (between main in/out lines) : 120 kPa
Maximum pressure difference (between main in/out lines) : 200 kPa
T
air
(°C)
Min. T
coolant
(°C)
I
= 95%
I
= 80%
I
= 65%
I
= 50%
I
= 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 4 °C (39 °F) or above.
Consult an ABB representative if operation below coolant temperature 4 °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
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)
ACS880LC_coolant temp derating curve.pdf
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 177