Hx-Unit Electrical Box; Installation Specifications; Liquid Quality - Danfoss VACON NX Commissioning And Maintenance Manual

1 8 VACON
If there is no monitoring equipment in the secondary circuit, it is harder to determine the reason for
a possible alarm from the HX-unit. Secondary circuit flow (or pressure difference) and temperature
monitoring might in some cases help to prevent an unexpected shutdown of the drive.
4.2.6 HX- unit electr ical box
The electrical box inside the HX-unit consists of a motor protection relay, 400/24 V DC power supply
and a terminal.
There are three switches attached to the electrical box door; main
power switch, pump power switch and leak sensor reset switch.
•
Main power switch (red/yellow in Figure 4.2-7) is connected
to the motor protection relay
The contact breaker controls the main power to the HX-unit,
including the HX control unit.
•
Pump power switch (black and white in Figure 4.2-7),
power to the HX-unit pump (PU11). The pump can be started
•
LS11 leak sensor reset switch (white in Figure 4.2-7) resets
the leak alarm. To reset the alarm, the liquid must first be
removed from the sensor on the HX-unit leakage plate.
There are also three indication lights on the electrical box door. The colours indicate the fol lowing:
•
Red indicates that the HX-unit is not working within correct parameter values. Either the
temperature has reached the high-temperature shutoff limit or the flow is too low in the
disconnected, therefore the main drives are offline.
•
Yellow indicates that there is an active alarm in the HX-unit, meaning that the HX-unit is
working outside the optimal temperature and/or pressure range or that there is a leak inside
the unit.
•
The troubleshooting guide is found in chapter
active then you can find more information by accessing the HX control box interface panel.
Information on how work the panel is found in the VACON
the unit.
4.3

INSTALLATION SPECIFICATIONS

4.3.1 Liquid quality

In the primary circuit, the quality of the liquid has to be as presented in Table 4.3-1, Liquid quality.
The liquid should not contain organic sediment or chemically active qualities. The liquid can be
treated with corrosion inhibitor s suitable for AISI pipes, PTFE and Tesnit BA-S seals. When adding
liquid to the primary circuit it is recommended that a filter be used so that no particles larger than
0.3 mm can enter the primary circuit.
4
7 TROUBLESHOOTING. If the yellow or red indicator is
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Local contacts: http:/ / dr ives.danfoss.com/ danfoss- dr ives/ local - contacts/
I NTRODUCTI ON
Figure 4.2-7
al to the main drives is