Pipe Connections; Pipe Flushing - Danfoss VACON NX Commissioning And Maintenance Manual

2 2 VACON

5.1.3 Pipe connections

Figure 5.1-4
Figure 5.1-6
If the HX-
HX-unit and the main drives, the pressure loss of the piping between the HX-unit and the drive must
not exceed 1.0 bar. If the calculated pressure loss is higher than 1.0 bar then the HX-unit will not be
able to produce the maximum flow of 360 l/min that is specified for the HXL120. If the 360 l/min is
required for the installed main drives (e.g. one VACON
point where the calculated pressure loss, for the added piping, is more than 1.0 bar it is
recommended that two units is used instead.
Figure 5.1-8
If the HX-unit is delivered as a part of NX Liquid Cooled switchgear, therefore being in the same line-
up, then the connections between the HX-unit and the drive are ready and the customer only needs
to connect the secondary circuit piping.

5.1.4 Pipe flushing

All piping in the primary or secondary system made by the customer and/or end-user must be
flushed before being connected to the HX-unit. If the pipes have been welded with a TIG it is
sufficient to clean the pipes by blowing pressurized air through them. If the welding has been done
by other means the pipes have to be thoroughly flushed with water at a minimum of 3 m/s for 5
minutes.
5
Standard connections are DN50 flanges according to DIN2642. Flange adapters
are delivered in a separate box. When placing the HX-unit
connector parts that are screwed on to the pipes on the
primary and secondary connections. This is because the total
width is about 716mm when the connectors are on, and the
712mm.
Figure 5.1-5
The material of the primary circuit and secondary circuit
flanges is AISI 316. It is also possible to get PN16 flanges
according to DIN 2633 (AISI 304) to secondary circuit.
The wall penetration is made according to IP54 requirements.
Figure 5.1-7
line-up as the drives, therefore creating piping between the
Local contacts: http:/ / dr ives.danfoss.com/ danfoss- dr ives/ local - contacts/
®
3xCh74) but the HX-unit has to be placed at a
Additional piping between
HX-unit and the main drives
COMMI SSI ONI NG
Secondary circuit
inlet/outlet