Retrotec DM-2A Manual de usuario Pagina 52

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©Retrotec Inc. 2012
7.10 Pressure overshoots when using the Set Pressure key
When Set Pressure is used to establish 60 Pa for example, the pressure will overshoot to 90 Pa for a
few seconds before it settles back to the desired 60 Pa. If this is a concern, start the fan on Set Speed
or set to a lower pressure and then use the Jog key to increase the set point in smaller steps. The
gauge's controller has been optimized to achieve the desired pressure as quickly as possible and to
remove the overshoot would force the user to wait much longer.
When using the FanTestic software, set the pressure to go to the lowest pressure first. Eg. Set pressure
range from 10 to 60 Pa, NOT 60 to 10 Pa.
To experience the overshoot and understand how to avoid it, perform the following test on the
Retrotec simulator or a tight room where the leakage can be adjusted.
Set Device to 1000 for example, range to C1, time averaging to 10 seconds.
Set the leakage area on an enclosure by adjusting the size of the hole. When using the Retrotec
simulator, use the slider. Optionally, measure the leakage area with a Door Fan using EqLA which you
can access using the Mode key. Watch the gauge carefully to detect the peak pressure reading on
Channel A in the peak percent speed on the bottom right-hand of the display.
Device [1000, 2000, 3000]
1000
1000
1000
1000
1000
1000
1000
Range, [C4, C2, C1]
C1
C1
C1
C1
C1
C1
C1
Time averaging, seconds
4
4
4
4
4
4
4
Actual leakage area as measured,
8 in
2
12 in
2
16 in
2
20 in
2
24 in
2
28 in
2
32 in
2
Press [Set Pressure]
60Pa
60Pa
60Pa
60Pa
60Pa
60Pa
60Pa
Read peak pressure from gauge
92Pa
83Pa
71Pa
60Pa
60Pa
60Pa
60Pa
Read peak % speed from gauge
34%
33%
32%
37%
49%
61%
76%
Read final % speed from gauge
15%
18%
27%
37%
49%
61%
76%
Pressures will overshoot when the range is incorrectly set too low. Ranges should always be selected
where the fan runs the fastest possible speed in order to achieve the highest desired test pressure.
If you believe you have a problem with overshoot, fill out the table below and send it to tech-support.
Device [1000, 2000, 3000]
Range, [C4, C2, C1]
Time averaging, seconds
Actual leakage area as measured,
Press [Set Pressure]
Read peak pressure from gauge
Read peak % speed from gauge
Read final % speed from gauge
Set the correct Device on your gauge because it will respond differently to different Devices.
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