Flow Rates In Parallel Power Units - Danfoss iC7 Series Design Manual

Design Guide | iC7 Series Liquid-cooled System Modules
Table 9: Liquid-cooled Input and Output Filters
Product
LC Filter for AFE/GC OF7Z1
LC Filter for AFE/GC OF7Z1
LCL Filter for AFE/GC OF7Z3
LCL Filter for AFE/GC OF7Z3
L Filter OF7Z5
L Filter OF7Z5
L Filter OF7Z5
dU/dt Filter OF7U1
dU/dt Filter OF7U1
dU/dt and CM Filter OF7U2
Sine-wave Filter OF7S1
Sine-wave Filter OF7S1
DC Filter OF7D1
DC Filter OF7D1

Flow Rates in Parallel Power Units

6.4.3.1
In system modules with 2 parallel power units and a filter (IR12L/AR12L/DR12L), the flow rate of the coolant is not divided equally
between cooling channels 1 and 2. The difference in flow rate between the cooling channels is significant, but normal behavior. There is
a difference in flow rate, because the filter is connected to the inlet of channel 2 and outlet of channel 1.
The following tables show coolant flow rates measured from the inlet channels of IR12L and AR12L modules.
PU1 PU2
Filter
Channel 1 Channel 2
Figure 23: Coolant Flow in Parallel Power Units
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Current at Nominal flow
690 V AC [A] rate with
water [l/min]
380 8.0
760 11.0
400 15.5
800 18.5
400 7.5
1000 7.5
1640 8.5
416 18.5
820 20.5
416 18.5
416 8.0
820 11.0
570 6.7
1200 11.0
Nominal flow Nominal flow
rate with rate with
30% glycol [l/ 50% glycol [l/
min] min]
10.4 12.0
14.3 16.5
20.2 23.3
24.1 27.8
9.8 11.3
9.8 11.3
11.1 12.8
24.1 27.8
26.7 30.8
24.1 27.8
10.4 12.0
14.3 16.5
8.7 10.1
14.3 16.5
Maximum Liquid
flow rate [l/ volume per
min] element [l]
12.8 0.70
17.6 1.25
24.8 0.90
29.6 1.25
12.0 0.20
12.0 0.20
13.6 0.60
29.6 0.68
32.8 1.34
29.6 0.68
12.8 0.70
17.6 1.25
10.7 0.70
17.6 1.25
AJ475942178716en-000101 / 172K2848A