Installation vacon • 65
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5
The hoses must tolerate a peak pressure of 30 bar.
Connect the line hose to its counterpart (screw connector or fast connector) on the cooling element
of the AC drive/inverter. The coolant inlet connector is the one closer to the mounting plate and the
outlet connector the one closer to the face of the drive, see Figure 32. Due to high pressure in the
line hose, it is recommended to equip the liquid line with a shut-off valve, which makes the
connection easier. In order to prevent water from spraying in the installation room we also
recommend to wrap e.g. linters around the connection on installing.
We also recommend to equip the pipe branches to the cooling elements with valves.
5.2.2.2
Installation of flow switch
As stated on page 57, we recommend the installation of flow supervision in the liquid cooling
system. You can order the flow switch as an option. The specification of the flow switch as well as
notes as concerns its installation are given below.
About the installation
We recommend to mount the flow switch on the inflow side of the system (see Figure 24). Pay
attention to the direction of flow. The switch reaches the highest accuracy when it is mounted in
horizontal position. If mounted vertically, the mechanical sensor is affected by the Earth’s gravity
which reduces the accuracy according to the data given in Table 24.
Figure 31. Flow switch: Hose connection, fast connector (electrical), fast connector lock screw, cable
seal and clamp
Table 24. Flow switch data
Hose connection G1/2” female, internal thread ISO228-1
Closing The switch closes if the flow exceeds 20 l/min.
Switching accuracy:
Horizontal installation
Vertical installation
–5…+15% (19…23 l/min)
±5% (19…21 l/min)
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