Low Pressure Alarm - Danfoss VACON NX Commissioning And Maintenance Manual

5 4 VACON
7.1.3 Low pr essur e alar m
If the l ow pr essur e alar m is active (acc. to panel below) the HX-
door are also active. Check the following issues to solve why the alarm has been activated:
RUN
F1.
I/ O ter m
82 InletPressLow
A T1 T16
Figure 7.1-4, Low pressure alarm on the NXP panel
Mal function
Leak in the primary
circuit outside the
HX-unit.
Pressure vessel
EV11 (refer to the
P&ID) is without
pre-pressure.
Other reason.
Table 7.1-4, Pressure fault detection
7
READY ALARM

Reasons for mal function
Loose connection.
Faulty connection.
Hose failure in the main
drive section.
The gas (air or nitrogen)
has escaped through
the butyl
membrane
primary circuit.
The EV11 filling valve is
broken and therefore
letting out gas.
The butyl membrane
inside the expansion
vessel is broken.
Faulty pressure sensor
Local contacts: http:/ / dr ives.danfoss.com/ danfoss- dr ives/ local - contacts/
Cor r ection measur es
Tighten the connection until the leak stops.
Add liquid to the primary circuit until the
correct pre-pressure is reached. Follow
the instructions in
liquid and
Replace the broken parts. Then add liquid to
the primary circuit until the correct pre-
pressure
instructions in
and de-airing.
Replace the hose. Refer to the NX Liquid
the primary circuit until the correct pre-
pressure
instructions in
and de-airing.
Check and refill the pre-pressure according to
the instructions in
rubber vessel.
into the
Replace the valve and refill the pre-pressure
according to the instructions in
6.2.3 Pressure
Replace the expansion vessel and refill the
pre-pressure according to the instructions
in chapter 6.2.3 Pressure
Compare the value from the pressure gauge,
PI11, with the value from the pressure
transmitter
transmitter is broken it has to be replaced.
TROUBLESHOOTI NG
chapter 5.1.7, Adding
de-airing.
is reached. Follow
chapter 5.1.7, Adding liquid
is reached. Follow
chapter 5.1.7, Adding liquid
chapter 6.2.3 Pressure
vessel.
vessel.
PT11. If the
the
the
chapter
pressure